Publicación: PREPARATION, SPECTROSCOPIC, AND ELECTROCHEMICAL CHARACTERIZATION OF METL (II) COMPLEXES WITH SCHIFF BASE LIGANDS DERIVED FROM CHITOSAN: CORRELATIONS OF REDOX POTENTIALS WITH HAMMETT PARAMETERS
Fecha
2014
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JOURNAL OF COORDINATION CHEMISTRY
Resumen
THE CHITOSAN?(FE(II), CO(II), AND CU(II)) COMPLEXES WERE PREPARED BY MIXING CHITOSAN (CHI) POWDER WITH A SALICYLALDEHYDE (SAL, 5-HYDROGEN (?H)) AND THEIR 5-BROMO (?BR), 5-CHLORO (?CL), 5-METHOXY (?OCH3), 5-FLUORO (?F), 5-METHYL (?CH3), AND 5-NITRO (?NO2) DERIVATIVES (GROUPS R) AND MIXING THESE WITH FECL2 AND CUCL2 IN ETHANOL AND WITH CO(CH3COO)2 SOLUTIONS IN BUTANOL AT 80 °C OVER 8 H IN HETEROGENEOUS PHASE, FOLLOWED BY EXTRACTION WITH ETHANOL AND BUTANOL, RESPECTIVELY. THE COMPLEXES WERE CHARACTERIZED BY FTIR AND UV?VIS SPECTROSCOPY, ELEMENTAL ANALYSIS, AND CYCLIC VOLTAMMETRY. A LINEAR CORRELATION BETWEEN THE METAL FORMAL POTENTIAL VERSUS THE HAMMETT PARAMETERS OF THE SUBSTITUENTS WAS OBSERVED. THE ELECTRON-WITHDRAWING GROUPS SHIFT THE REDOX POTENTIAL TO POSITIVE VALUES, AS A RESULT OF LOWERING THE ENERGY OF THE HIGHEST OCCUPIED MOLECULAR ORBITAL. THE FORMAL POTENTIAL WAS USED AS A MEASUREMENT FOR THE DRIVING FORCE OF CHITOSAN COMPLEXES FOR REDOX REACTIONS.
