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Ferrocene amphiphilic D–π–A dyes: synthesis, redox behavior and determination of band gaps†
B. López-Mayorga,C. I. Sandoval-Chávez,P. Carreón-Castro,V. M. Ugalde-Saldívar,F. Cortés-Guzmán,J. G. López-Cortés,M. C. Ortega-Alfaro
New Journal of Chemistry Pub Date : 02/28/2018 00:00:00 , DOI:10.1039/C8NJ00787J
Abstract

We report the synthesis of a series of ferrocene amphiphilic donor–π–acceptor dyes, with the general formula (Fc-CH[double bond, length as m-dash]CH-HetNC16H33)+ X [where: Fc behaves as the donor group, a double bond as the π bridge, and 2-,4-pyridinium and 4-quinolinium as the potent acceptor groups (2a–b and 4, X = Br or BF4)], in good overall yields. Together with their neutral counterparts (6a–b and 7), the photophysical and electrochemical properties of these compounds were investigated by means of UV-Vis spectroscopy and cyclic voltammetry. The optical and electrochemical band gaps of these dyes were calculated, which indicated that 4 has the lowest bandgap value. Time-dependent DFT calculations indicate that the lowest energy absorption band displayed for these compounds has mainly metal-to-ligand charge transfer character, with the HOMO–LUMO electronic transition being the main contribution.

Graphical abstract: Ferrocene amphiphilic D–π–A dyes: synthesis, redox behavior and determination of band gaps
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