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Synthesis of hyperpolarizable biomaterials at molecular level based on pyridinium-chitosan complexes

Opened Access Synthesis of hyperpolarizable biomaterials at molecular level based on pyridinium-chitosan complexes

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Autor: Franconetti García, Antonio
Contreras Bernal, Lidia
Prado Gotor, Rafael
Cabrera Escribano, Francisca
Departamento: Universidad de Sevilla. Departamento de Química orgánica
Universidad de Sevilla. Departamento de Química Física
Fecha: 2015
Tipo de documento: Artículo
Resumen: Potential NLO-phore materials based on chitosan are described for the first time in this study. A series of fluorescent and quaternized pyridinium– chitosan derivatives have been synthesized by reaction of this polymer with easily available tunable pyrylium tetra fluoroborate salts. Among other spectroscopic techniques, 19 F NMR, 13 C CPMAS NMR and 2D diffusion experiments, were used to con firm the structures of the new pyridinium– chitosan complexes that show high fluorescence intensity. Degrees of N -substitution were achieved lower than 4.3%, allowing the original physicochemical properties of the biopolymer to be preserved. DFT calculations have been performed to investigate the molecular features related to the NLO properties in these compounds. NLO behavior was found to be clearly dependent on the nature and location of the substituent into the pyridinium core. Theoretical data reveal a large permanent dipolar moment, polarizabilities and hyperpolarizabilities making th...
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Tamaño: 592.1Kb
Formato: PDF

URI: http://hdl.handle.net/11441/68067

DOI: 10.1039/c5ra09397j

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