Artículos (Química Inorgánica)

URI permanente para esta colecciónhttps://hdl.handle.net/11441/10919

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Catalytic performance of NiCo-CePr oxide on FeCrAlloy micromonoliths in hydrogen production by oxidative steam reforming of ethanol
(Elsevier, 2025-10-01) Rodríguez, César; Martínez Tejada, Leidy Marcela; Centeno Gallego, Miguel Ángel; Moreno, Sonia; Molina, Rafael; Universidad de Sevilla. Departamento de Química Inorgánica; Universidad Nacional de Colombia
The conformation of a NiCo catalyst promoted by CePr on FeCrAlloy thermally pretreated micromonoliths was investigated via washcoating using a colloidal suspension of the catalytic precursor (hydrotalcite, HT) without the use of additives. A high affinity was established between the nature of the reconstructed HT and the layer of the formed alumina microstructures obtained after thermal treatment, which exhibited high material adhesion. The effect of the amount of catalyst incorporated into the sinusoidal microchannels of monoliths was also investigated. The catalytic performance was evaluated for the production of H2 from oxidative steam reforming of ethanol (OSRE) and compared with that of a powder catalyst (slurry) and an uncoated micromonolith. The results indicated notable benefits from the micromonoliths, especially when incorporating low amounts of catalyst with low layer thicknesses-LT (8 g·L-1, layer thickness ∼ 0.3 µm), achieved a hydrogen yield of 2.86 molH2·molEtOH-1, comparable to that of the powder catalyst benchmark (2.91 molH2·molEtOH-1), but with enhanced stability at 65 h and improved heat and mass transport characteristics. Overall, this study opens the way for the promising feasibility of scaling up the OSRE reaction to produce H2.
Impact of Tb4+ and morphology on the Thermal Evolution of Tb-doped TiO2 Nanostructured Hollow Spheres and Nanoparticles
(Elsevier, 2021-02-05) Colomer, M. T.; Rodríguez, E.; Morán Pedroso, María; Vattier Lagarrigue, María Florencia; Andrés, A. de; Universidad de Sevilla. Departamento de Física de la Materia Condensada; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia, Innovación y Universidades (MICIU). España; European Union (UE)
Tb-doped TiO2 hollow spheres (HSs) in the range 0.0-2.0 at.% have been,synthesized by the first time to the best of our knowledge. The HSs are compared with,nanoparticles (NPs) to evaluate the impact of morphology on their physicochemical and,photoluminescence (PL) behavior upon increasing calcination temperature. After,calcination at 550ºC, the particles are anatase with a primary average size of 10.0 ± 0.2,nm for the NPs and 12.0 ± 0.2 nm for those that form the micron sized hollow spheres of,1.8 µm diameter and ca. 64 nm shell thickness. The temperature of the anatase–rutile,transition is found to be strongly dependent on the presence of Tb as well as on,morphology. Contrarily to the usual stabilization of anatase when doping with trivalent,rare-earth ions, the transition temperature is reduced when doping with Tb. The rutile,phase is further favored for the HSs compared to the NPs probably related to the low,density of the HSs and/or a more efficient packing of the nanoparticles that form those,spheres with respect to the packing of the NPs. A slight unit-cell volume decrease for the,anatase structure is observed upon Tb doping, in both the NPs and in the HSs, contrary to,the expected increment due to the larger ionic radius of Tb3+ compared to Ti4+,. In addition,,2,the intensity of the characteristic f-f Tb3+ emission bands is extremely weak both in the,anatase and rutile phases. The transition is accompanied with the emergence of an infrared,emission band centered at 810 nm related to the formation of defects during the structural,transformation providing deep levels in the gap that partly quench the f-f emissions in the,rutile phase. The results are consistent with the presence of Tb in both +3 and +4 valence,states. XPS measurements confirmed the presence of Tb3+ as well as of Tb4+ in both HSs,and NPs with a Tb4+ fraction that increases with increasing Tb doping. The large fraction,of Tb4+ present in the samples originates the weak f-f emission intensity, the slight,decrease of the cell parameters and the destabilization of the anatase phase
Selective H/D Exchange in E–H (E = Si, Ge, Sn) Bonds Catalyzed by 1,2,3-Triazolylidene-Stabilized Nickel Nanoparticles
(American Chemical Society, 2025) Molinillo, Pablo; Gálvez Del Postigo, Ana; Puyo, Maxime; Vattier Lagarrigue, María Florencia; Beltrán, Ana M.; Rendón Márquez, Nuria; Lara Muñoz, Patricia; Suárez, Andrés; Universidad de Sevilla. Departamento de Química Inorgánica; Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte; Ministerio de Ciencia e Innovación (MICIN). España; European Union (UE)
Nickel nanoparticles (Ni·MIC) stabilized with mesoionic 1,2,3-triazolylidene (MIC) ligands were prepared via decomposition of the [Ni(COD)2] (COD = 1,5-cyclooctadiene) complex with H2 (3 bar) in the presence of 0.2 or 0.5 equiv of ligand. The obtained monodisperse and small-sized (3.2–3.8 nm) nanoparticles were characterized by high-resolution transmission electron microscopy (TEM, HRTEM) and inductively coupled plasma (ICP) analysis. Further analysis of the nickel nanoparticles by X-ray photoelectron spectroscopy (XPS) demonstrated the coordination of the MIC ligands to the metal surface. Finally, the Ni·MIC nanoparticles were applied in the isotopic H/D exchange in hydrides of group 14 elements (Si, Ge, Sn) using D2 gas under relatively mild conditions (1.0–1.8 mol % Ni, 1 bar D2, 55 °C). High and chemoselective deuterium incorporation at the E–H (E = Si, Ge, Sn) bond in these derivatives was observed.
Formation of the complete range of Ti5Si3-xGe x solid solutions via mechanically induced self-sustained reactions
(Elsevier, 2011-11) Córdoba Gallego, José Manuel; Chicardi Augusto, Ernesto; Avilés Escaño, Miguel Ángel; Gotor Martínez, Francisco José; Universidad de Sevilla. Departamento de Química Inorgánica; Universidad de Sevilla. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte; Agencia Estatal de Investigación. España
The complete range of Ti5Si3-Ti5Ge 3 solid solutions was synthesised from elemental mixtures of Ti, Si, and Ge under an inert atmosphere via mechanically induced self-sustaining reactions (MSR). The stoichiometry of Ti5Si3-xGe x solid solutions was controlled by adjusting the Si/Ge ratio of the initial mixture. The chemical composition and lattice parameters of the materials confirmed that Ti5Si3-Ti5Ge 3 solid solutions with good chemical homogeneity could be produced via MSR.
V2O5/TiO2 Catalyst for Catalytic Glucose Oxidation to Formic Acid in Batch Reactor: Vanadium Species Nature and Reaction Conditions Optimization
(Springer, 2024-07-04) Álvarez Hernández, Débora; Ivanova, Svetlana; Domínguez Leal, María Isabel; Martínez Blanes, José María; Centeno Gallego, Miguel Ángel; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia, Innovación y Universidades (MICIU). España; Agencia Estatal de Investigación. España; European Union (UE)
This study focused on the development of vanadium-based catalysts for formic acid production from glucose. The influence of different vanadium precursors on the catalytic activity of titania supported catalysts was contemplated and compared to the performance of commercial and synthesized unsupported V2O5. The obtained results reveal a successful deposition of multiple vanadium species on TiO2 as confirmed by XRD, Raman, and UV-Vis measurements. Catalyst screening identifies V5+ species as main player indicating its important oxidizing potential. Afterwards, the key reaction conditions, as temperature, time, pressure and catalyst loading, were optimized as well as the state of the catalyst after the reaction characterized.
Stepwise alkyne insertion in Au(i) acetylides: influence of the nuclearity
(Royal Society of Chemistry, 2025-02-13) Cayuela-Castillo, Juan; Fernández de Córdova, Francisco José; See, Matthew S.; Fernández, Israel; Ríos Moreno, Pablo; Universidad de Sevilla. Departamento de Química Inorgánica; Junta de Andalucía; Ministerio de Ciencia, Innovación y Universidades (MICIU). España; Agencia Estatal de Investigación. España
The reaction between NHC-supported (NHC = N-heterocyclic carbene) gold(I) trimethylsilylacetylide complexes with NHC gold(I) hydroxide species renders different symmetrical homobimetallic Au complexes. These compounds readily undergo migratory insertion of DMAD (dimethyl acetylenedicarboxylate) at 25 °C to give the corresponding bimetallic enyne products. On the contrary, monometallic analogues require much more forcing conditions (excess of DMAD and temperature $110 °C) to give the same transformation. Experimental and computational studies reveal that the second metal fragment is responsible for the enhanced nucleophilicity of the reactive carbon atom of the acetylide C^C bond, which initially leads to a more favorable interaction with DMAD in the ratedetermining step of an unprecedented, stepwise mechanism where the lability of the Au–C bonds plays an instrumental role. The enhanced reactivity displayed by the bimetallic species was leveraged in the insertion of other substrates such as heterocumulenes.
Taking dual function materials (DFM) from the laboratory to industrial applications: a review of DFM operation under realistic integrated CO2 capture and utilization conditions
(Oxbridge Publishing House Ltd, 2024-11-19) Bahrami Gharamaleki, Soudabeh; Ramírez Reina, Tomás; Duyar, MeIis S.; Universidad de Sevilla. Departamento de Química Inorgánica
Integrated CO2 Capture and Utilization (ICCU) is gathering momentum as a promising strategy to curb harmful CO2 emissions. This approach enables the use of dilute emissions as a source of carbon for chemical synthesis through processes like methanation, reverse water gas shift, or dry reforming of methane. One ICCU approach is performed using dual function materials (DFMs), which contain adsorbent and catalytic components. While utilizing DFMs for CO2 capture and conversion can potentially enhance reaction yields and lower costs by intensifying CO2 utilization processes, the practical use of these materials under relevant industrial settings is limited. Bringing this technology to real applications demands a deep scientific exploration, particularly regarding their behavior in the presence of impurities and high levels of oxygen. Herein we critically analyze the performance of different adsorbents and catalysts under realistic conditions for CO2 capture and conversion into methane or syngas. Additionally, we discuss the stability of DFMs when exposed to various contaminants that typically poison heterogeneous catalysts and identify several research gaps in this area.
Spark plasma sintering influence on microstructure and mechanical properties of Ti:Ta/carbonitride ceramic matrix composites
(Elsevier, 2025-04) Córdoba Gallego, José Manuel; Universidad de Sevilla. Departamento de Química Inorgánica
A mechanically induced self-sustaining reaction was carried out to synthesize a Ti0.9Ta0.1C0.5N0.5/Co powdered cermets, and then they were sintered by spark plasma sintering. Microstructural parameters effects studied by image analysis, and chemical composition (studied by Rietveld analysis) on the microhardness, hardening rate, fracture toughness, transverse rupture strength, and Young’s modulus were related to the sintering conditions. The optimization of the sintering conditions (1150 ◦C, 30 MPa, and 8 min’ dwell time) drove to a homogeneous microstructure and outstanding mechanical properties. Also, the tantalum was suggested to influence the interfacial energies of the system, yielding a stronger hard phase skeleton.
Solid-state spectroscopic, thermokinetics and thermal analysis of aceclofenac coordination complexes with lanthanum and gadolinium
(Soc Brasileira Quimica, 2024-05-24) Melo, Laís D. S. M. K; Carvalho, Cláudio T.; Sánchez Jiménez, Pedro Enrique ; Sequinel, Thiago; Perejón Pazo, Antonio; Pérez Maqueda, Luis Allan ; Colman, Tiago A. D.; Universidad de Sevilla. Departamento de Química Inorgánica; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). Brasil; Finaciadora de Estudos e Projetos (FINEP). Brasil
In recent years, the field of coordination chemistry has experienced a surge in interest regarding the synthesis and characterization of coordination complexes for diverse applications. This study is dedicated to investigating coordination compounds resulting from the interaction of nonsteroidal anti-inflammatory drugs (NSAIDs) with metal ions. The study research places significant emphasis on understanding the stability and thermal behavior of these coordination compounds. The utilization of thermoanalytical techniques is crucial in achieving this goal. Thermal analysis and thermokinetics provide valuable insights into the underlying mechanisms, kinetics, and energetics of these reactions, thereby facilitating the optimization of synthesis procedures. The research employs concurrent techniques, namely thermogravimetric analysis (TG) and differential scanning calorimetry (DSC), to explore the thermal stability and decomposition pathways of these coordination compounds. Thermokinetic models and optimization methodologies are subsequently applied to identify key reaction parameters. The primary aim of this research is to unveil the thermal behavior, stability, and reaction kinetics of aceclofenac coordination compounds, thus contributing significantly to the understanding of thermokinetics and thermal analysis in the domain of coordination chemistry. Specifically, this study is focused on aceclofenac coordination complexes involving lanthanum and gadolinium, with the ultimate goal of advancing the field of coordination chemistry
Integrated CO2 capture and dynamic catalysis for CO2 recycling in a microbrewery
(Elsevier, 2025-02) Merkouri, Loukia Pantzechroula; Bobadilla Baladrón, Luis Francisco; Martín Espejo, Juan Luis; Odriozola Gordón, José Antonio; Penkova, Anna Dimitrova; Torres Sempere, Guillermo; Ramírez Reina, Tomás; Short, Michael; Duyar, Melis S.; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia, Innovación y Universidades (MICIU). España; Agencia Estatal de Investigación. España; European Union (UE)
In this study, we used fermentation off-gases from a brewery for integrated CO2 capture and utilisation in order to produce CH4 with a dual-function material (DFM) containing NiRu as catalyst and dispersed CaO as adsorbent. CH4 was produced from captured CO2 via 2 pathways (fast and slow), proceeding through formyl intermediates according to the operando DRIFTS-MS results. The NiRuCa DFM showed a stable CH4 capacity over 8 cycles (105 μmol/gDFM) with fermentation off-gases being used as a CO2 capture feed. H2O and O2, which were present in small amounts in the emissions feed, resulted in the passivation of Ni in the form of a NiO layer and hence, the DFM did not undergo excessive oxidation and deactivation. This work constitutes a first in terms of validating the use of DFMs with real industrial emissions, and it directly correlates the DFM activity performance with its reaction mechanism and intermediate species.
Improving the photocatalytic degradation of EDTMP: Effect of doped NPs (Na, Y, and K) into the lattice of modified Au/TiO2 nano-catalysts
(Elsevier, 2025-01) Riedel, Ramona; Schowarte, Julia; Semisch, Laura; González Castaño, Míriam; Ivanova, Svetlana; Arellano-García, Harvey; Martienssen, Marion; Universidad de Sevilla. Departamento de Química Inorgánica
This study presents the photocatalytic degradation of the aminophosphonate ethylenediaminetetra(methylenephosphonic acid) (EDTMP) with a range of different doped nanoparticles (NP). The photocatalysts were based on TiO2 benchmark P25 and gold (Au) doped either with sodium (Na), potassium (K) or yttrium (Y). The synthesized photocatalysts were characterized via TEM, XRF, XRD, UV-DRS (band gap estimation) and N2-physisorption. Photocatalytic pre-screening at pH values of 3, 7 and 10 indicated highest o-PO4 release of EDTMP at pH 7 and 10 for NP either doped with K or Y. The results of LC/MS analysis showed that the NPs doped with 5 % Y (Au2/Y5/P25) resulted in the fastest degradation of EDTMP. The target compound was completely degraded within 60 min, 4 times faster than photochemical treatment of unadulterated EDTMP. Importantly, also the transformation products were accelerated by the photocatalytic treatment with Au2/P25 either doped with 5 % Y or 10 % K. The results of scavenger experiments indicated that the enhanced photocatalytic degradation of EDTMP is primarily attributable to the presence of hydroxyl radicals in the bulk and to a lesser extent to •O2 − and electron-holes (h+) at the surface of the catalysts. The study demonstrates that the catalytic efficiency of TiO2 nanocomposites is significantly influenced by the choice of dopants, which affect particle size, band gap, and photocatalytic activity. Yttrium at low concentrations (i.e., 5 wt% Y) doping emerged as particularly effective, enhancing both the visible light absorption and h+ separation, leading to superior photocatalytic performance in the degradation of EDTMP. The Au content also plays a crucial role in enhancing the photocatalytic efficiency. However, the combination of Au and Na doping was found to be less effective for this photocatalysis in aqueous media, potentially due to larger particle sizes and insufficient dopant contents. In conclusion, the findings emphasise the necessity of optimising both the selection of dopants and the design of catalysts in order to enhance photocatalytic applications.
Improved CO selectivity during CO2 hydrogenation by bimetallic copper-cobalt supported SBA-15
(Elsevier, 2025-02) Escamilla, María; Caballero Martínez, Alfonso; Colón, Gerardo; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia, Innovación y Universidades (MICIU). España; Agencia Estatal de Investigación. España; European Union (UE)
Co-Cu/SBA-15 systems have been studied for the reverse water gas shift (rWGS) reaction within mild temperature range of 250–650 ºC. CuOx and CoOx species at different weight ratios were deposited from wet impregnation method over SBA-15 support. We have stated that pre-reduction treatment before reaction leads to the complete Co and Cu reduction for Co-Cu/SBA systems. A low copper content on Co/SBA system leads to similar CO2 conversion than monometallic Co-catalyst. However, competitive Sabatier side reaction appears almost suppressed. So, upon Cu incorporation a significant improvement on CO yield has been attained with respect to Co/SBA catalyst. Thus, a good compromise is attained at 450 ºC using Co5Cu5/SBA catalyst for which a stable CO2 conversion of 22 % and 97 % CO selectivity has been obtained under lowest H2:CO2 ratio.
Direct biogas methanation at moderate pressure: Mechanism investigation over Ni-based catalysts
(Elsevier, 2025-03) Giarnieri, Ilenia; Chen, Sining; Ballesteros Plata, Daniel; Holgado, Juan P.; Maluta, Francesco; Caballero Martínez, Alfonso; Mata Benito, Patricia; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia e Innovación (MICIN). España; Agencia Estatal de Investigación. España; European Union (UE); Junta de Andalucía
Direct upgrading of biogas by CO2 methanation aims to produce a gas to be injected into the grid. Operating at moderate pressures favors thermodynamics, but catalyst surface and reaction mechanism under realistic conditions are not well investigated. We study the role of basic and metallic sites on performance and mechanism of clean biogas methanation (CO2/CH4=1/1 v/v) at 1, 5 and 7 bar. Ni/Mg/La/Al hydrotalcite-derived catalysts, with different Ni and La contents, are investigated combining tests and physico-chemical characterization, including quasi-in situ XPS at 7 bar, with CO2-adsorption and methanation DRIFTS at 1 and 7 bar, respectively. An optimized catalyst (6.5 wt% La, 35 wt% Ni) with 3–4 nm Ni0 and balanced basicity, achieves 96 LCH4*gcat− 1 * h− 1 (300◦C, 7 bar). DRIFTS confirm catalysts activity experimental trend. Optimizing Ni and La results in higher consumption rates of formate intermediate and sufficient Ni0 sites for CO formation. Increasing pressure to 7 bar promotes CO and m-HCOO reactivity.
Chirality in metal-based antimicrobial agents: a growing frontier in biomedical research
(Royal Society of Chemistry, 2025-04-14) Montilla Ramos, Francisco Javier; Carrasco Carrasco, Carlos Jesús; Galindo del Pozo, Agustín; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia e Innovación (MICIN). España; Agencia Estatal de Investigación. España; European Union (UE)
Chirality is increasingly being recognised as a valuable tool in the design of novel metal complexes aimed at combating antimicrobial resistance. Chiral metal complexes possess unique spatial configurations that enable selective interactions with biological targets, providing innovative solutions for treating diseases such as cancer and antimicrobial-resistant infections. Although the relationship between the chirality of metal complexes and their antimicrobial activity was initially highlighted by Dwyer and collaborators in a seminal mid-20th-century study, subsequent research exploring this intriguing relationship has been limited. The few documented cases of enantiomer-dependent biocidal activity are mainly limited to a series of chiral silver complexes recently investigated by our group and the Nomiya research team, which demonstrate enhanced antimicrobial efficacy of specific enantiomers.
Carbon-carbon bond formation and cleavage at redox active bis(pyridylimino)isoindole (BPI) germylene compounds
(Royal Soc Chemistry, 2025) Nicasio, A. I.; Somerville, R. J.; Sahagún, P.; Soto, Enrique; López Serrano, Joaquín; Campos, J.; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia e Innovación (MICIN). España; Agencia Estatal de Investigación. España; European Union (UE); Junta de Andalucía
Bio-aromatics: Revolutionizing the integrated biomass and plastic waste valorization for high-value aromatic hydrocarbons via bifunctional catalytic pathways of bio-syngas conversion
(Elsevier, 2025-05) Saif, Maria; Blay Roger, José Rubén; Nawaz, Muhammad Asif; Bobadilla Baladrón, Luis Francisco; Ramírez Reina, Tomás; Odriozola Gordón, José Antonio; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia e Innovación (MICIN). España; Agencia Estatal de Investigación. España; European Union (UE)
Aromatic hydrocarbons play a pivotal role in various industrial applications, serving as essential building blocks to produce polymers, resins, and specialty chemicals. Traditionally, their synthesis has been reliant on fossil fuels, raising concerns about environmental sustainability and resource depletion. However, recent advancements in the field have paved the way for a paradigm shift, with a focus on biomass-derived synthesis gas as a renewable and environmentally friendly feedstock. This review explores innovative shortcuts in the synthesis of aromatic hydrocarbons, a key area of research that holds promise for a more sustainable and efficient future. As we delve into the intricacies of biomass-derived synthesis gas conversion, we will examine breakthroughs in catalyst development, process optimization, and integrated approaches. By scrutinizing these advancements, we aim to provide a comprehensive overview of the current state of the art, highlighting both challenges and opportunities for further exploration. The urgency of addressing environmental concerns and the growing demand for renewable alternatives underscore the importance of reevaluating the methodologies. The unique characteristics of biomass-derived synthesis gas coupled with co-gasification processes present an intriguing avenue for redefining the landscape of aromatic hydrocarbon synthesis. Through this exploration, we seek to unravel the complexities of these innovative shortcuts, offering insights that may contribute to a more sustainable and greener future for the chemical industry.
Pathways to Metal-Ligand Cooperation in Quinoline-Based Titanium(IV) Pincers: Nonelectrophilic N-methylation, Deprotonation, and Dihydropyridine Formation
(American Chemical Society, 2021-06-07) Fandos, Rosa; Rodríguez Delgado, Antonio; Rodríguez, Ana; Romero, Iván; Organero, Juan Ángel; Álvarez González, Eleuterio; Universidad de Sevilla. Departamento de Química Inorgánica; Junta de Castilla-La Mancha; Ministerio de Economía y Competitividad (MINECO). España
A series of titanium(IV) complexes stabilized by quinoline-based pincer ligands have been synthesized and characterized. The reaction of [TiCp*Me3] with 8-hydroxy-2-quinolinecarboxaldehyde results in [TiCp*Me{κ3-N,O,O-(OCH)(8-O-N-Me-quin)}] (1), which shows an uncommon N-methylation/dearomatization of the pyridinic ring; in contrast, when 8-hydroxy-2-quinolinemethanol reacts with the same Ti(IV) trimethyl derivative, the expected monoalkyl complex [TiCp*Me{κ3-N,O,O-(OCH2)(8-O-quin)}] (2) is formed. The pincer ligand in 2 can be dearomatized by deprotonation of the methylene fragment, yielding [TiCp*Me{κ3-N,O,O-(OCH)(8-O-quin)}][Li(Et2O)] (3·Et2O) and [TiCp*Me{k3-N,O,O-(OCH)(8-O-quin)}][Li(Py)2] (3·2Py), or by incorporation of a hydride group into the para position of the pyridinic ring, giving [TiCp*Me{κ3-N,O,O-(OCH2)(4-H-8-O-quin)}][Li·THF] (5). Compounds 1, [TiCp*{κ3-N,O,O-(OCH2)(4-H-8-O-quin)}]2 (6), and [TiCp*{κ3-N,O,O-(OCH2)(4-H-8-O-quin)}]2[Li·THF]2(μ-O)] (7) have been studied by X-ray diffraction. Additionally, DFT quantum mechanical calculations were performed on complexes 1 and 2.
Sweet MOFs: exploring the potential and restraints of integrating carbohydrates with metal-organic frameworks for biomedical applications
(Royal Soc Chemistry, 2025-03-04) Zuliani, A; Ramos, V.; Escudero Belmonte, Alberto; Khiar, Noureddine; Universidad de Sevilla. Departamento de Química Inorgánica; Junta de Andalucía; Ministerio de Ciencia e Innovación (MICIN). España; European Union (UE)
The unique features of metal–organic frameworks (MOFs) such as biodegradability, reduced toxicity and high surface area offer the possibility of developing smart nanosystems for biomedical applications through the simultaneous functionalization of their structure with biologically relevant ligands and the loading of biologically active cargos, ranging from small drugs to large biomacromolecules, into their pores. Aiming to develop efficient, naturally inspired biocompatible systems, recent research has combined organic and materials chemistry to design innovative composites that exploit carbohydrate chemistry for the functionalization and structural modification of MOFs. Scientific investigation in the field has seen a significant rise in the past five years, and it is becoming crucial to acknowledge both the limits and benefits of this approach for future investigation. In this review, the latest research results merging carbohydrates and MOFs are discussed, with a particular emphasis on the advances in the field and the remaining challenges, including addressing sustainability and real-case applicability.
A practical analysis to predict sample overheating in flashexperiments using the current ramp methodology
(Wiley, 2025) Manchón-Gordón, Alejandro F.; Molina Molina, Sandra; Perejón Pazo, Antonio; Sánchez-Jiménez, Pedro; Pérez-Maqueda, Luis A.; Universidad de Sevilla. Departamento de Química Inorgánica; Junta de Andalucía; Ministerio de Ciencia e Innovación (MICIN). España
This work presents a straightforward strategy for achieving specific overheatingduring flash experiments by adjusting the initial electrical parameters. To do that,an extensive experimental analysis was performed to evaluate the temperatureevolution of dense ZnO specimens during controlled-current ramping at differ-ent furnace temperatures, which in turn modified the initial electrical resistanceof the sample. A detailed electrical explanation of controlled-current ramp flashprocesses is provided and, for the first time, a practical equivalence betweencurrent-ramp and temperature-ramp flash methodologies is established. Byparameterizing the experiments in terms of an effective power density, a con-sistent heating pattern following the blackbody radiation trend was identified,despite the different electrical characteristics of each experiment. Finally, a “flashheating map” is introduced, which can be used to determine the starting elec-trical parameters necessary to achieve a specific temperature increase, whetheremploying current or temperature ramps
Textile microfibers valorization by catalytic hydrothermal carbonization toward high-tech carbonaceous materials
(American Association for the Advancement of Science, 2024-11-18) Parrilla Lahoz, Silvia; Zambrano, Marielis C.; Pawlak, Joel J.; Venditti, Richard A.; Ramírez Reina, Tomás; Odriozola Gordón, José Antonio; Duyar, Melis S.; Universidad de Sevilla. Departamento de Química Inorgánica; Ministerio de Ciencia e Innovación (MICIN). España; Agencia Estatal de Investigación. España; Next Generation Europe
Microplastics fibers shed from washing synthetic textiles are released directly into the waters and make up 35% of primary microplastics discharged to the aquatic environment. While filtration devices and regulations are in development, safe disposal methods remain absent. Herein, we investigate catalytic hydrothermal carbonization (HTC) as a means of integrating this waste (0.28 million tons of microfibers per year) into the circular economy by catalytic upcycling to carbon nanomaterials. Herein, we show that cotton and polyester can be converted to filamentous solid carbon nanostructures using a Fe-Ni catalyst during HTC. Results revealed the conversion of microfibers into amorphous and graphitic carbon structures, including carbon nanotubes from a cotton/polyethylene terephthalate (PET) mixture. HTC at 200°C and 22 bar pressure produced graphitic carbon in all samples, demonstrating that mixed microfiber wastes can be valorized to provide potentially valuable carbon structures by modifying reaction parameters and catalyst formulation.

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