Intramolecular interactions and photoinduced electron transfer in isoalloxazine-naphthalene bichromophores

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• 作者：Gianluca Accorsi ; Francesco Barigelletti ; Angeles Farrá ; n ; Fern ; o Herranz ; Rosa Marí ; a Claramunt ; Massimo Marcaccio ; Giovanni Valenti ; Francesco Paolucci ; Elena Pinilla ; Marí ; a Rosario Tor
• 关键词：Flavine ; Macrocycles ; Photochemistry ; Electrochemistry ; Electron transfer
• 刊名：Journal of Photochemistry and Photobiology A: Chemistry
• 出版年：2009
• 出版时间：15 April 2009
• 年：2009
• 卷：203
• 期：2-3
• 页码：166-176
• 全文大小：1263 K

文摘

The synthesis, the structural characterization and electrochemical and photophysical properties of new linear (OFn) and macrocyclic (MFn) bichromophoric systems containing one flavin and one naphthalene moiety, separated by (CH₂)_n alkyl chains (n = 4 or 6), are reported. The electrochemical properties of OF4, OF6, MF4, MF6 were investigated by cyclic voltammetry (CV) in ultra-dry THF and compared with the model compounds containing either the flavin unit (FL6) or the monomethoxy- (mona) and dimethoxy naphthalene (dmona) derivatives, respectively. While only minor ground-state interactions were evidenced between the chromophores in the voltammetric curves and absorption spectra of bichromophores, luminescence data evidenced intramolecular photoinduced electron transfer processes as main deactivation routes of flavin-centered excited states. The rates of the intramolecular photoinduced electron transfer, involving the oxynaphthalene moieties as electron donors, were finally determined.