Artículo
Ligand Effects in Carbon−Boron Coupling Processes Mediated by σ-BH Platinum Complexes
Autor/es | Ríos Moreno, Pablo
Fernández de Córdova, Francisco José Borge, Javier Curado, Natalia Lledós, Agustí Conejero, Salvador |
Departamento | Universidad de Sevilla. Departamento de Química Inorgánica |
Fecha de publicación | 2021 |
Fecha de depósito | 2022-07-05 |
Publicado en |
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Resumen | The reaction of tri-coordinated boranes (derived from dioxaborolanes and diazaborolanes) with cyclometalated low-electron count platinum complexes [Pt(NHC’)(NHC)][BArF] (NHC=ItBuiPr, IMes, IMes*) led, at low temperature, ... The reaction of tri-coordinated boranes (derived from dioxaborolanes and diazaborolanes) with cyclometalated low-electron count platinum complexes [Pt(NHC’)(NHC)][BArF] (NHC=ItBuiPr, IMes, IMes*) led, at low temperature, to the formation of the corresponding σ-BH species. Some of these species have been characterized by X-Ray diffraction methods showing a rare η1-coordination mode. These compounds are thermally unstable and undergo a carbon-boron coupling process whose reversibility depends on the NHC ligand. DFT calculations indicate that the energy barriers required for C−B bond formation events (together with Pt−H bonds) are lower than the competitive reactions leading to C−H bond formation (and Pt−B bonds). However, the C−B coupling products appear to be formed under kinetic control with ItBuiPr ligands, whereas the relative low energy barrier leading to C−H bond formation is sufficiently low to form the thermodynamically more stable platinum boryl complexes at rt. The latter energy barrier is, nevertheless, too high for the systems bearing IMes and IMes* ligands. |
Agencias financiadoras | Ministerio de Ciencia e Innovación (MICIN). España Consejo Superior de Investigaciones Científicas (CSIC) European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) |
Identificador del proyecto | PID-2020-116861GB-I00
PID2019-109312GB-I00 RED2018-102387-T |
Cita | Ríos Moreno, P., Fernández de Córdova, F.J., Borge, J., Curado, N., Lledós, A. y Conejero, S. (2021). Ligand Effects in Carbon−Boron Coupling Processes Mediated by σ-BH Platinum Complexes. European Journal of Inorganic Chemistry, 2021 (35), 3528-3539. |
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