Structure-Property Relationships in Push-Pull Amino/Cyanovinyl End-Capped Oligothiophenes: Quantum Chemical and Experimental Studies

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• 作者：Marí ; a Moreno Oliva ; Juan Casado ; M. Manuela M. Raposo ; A. Maurí ; cio C. Fonseca ; Horst Hartmann ; Ví ; ctor Herná ; ndez ; Juan T. Ló ; pez Navarrete
• 刊名：Journal of Organic Chemistry
• 出版年：2006
• 出版时间：September 29, 2006
• 年：2006
• 卷：71
• 期：20
• 页码：7509 - 7520
• 全文大小：393K
• 年卷期：v.71,no.20(September 29, 2006)
• ISSN：1520-6904

文摘

A series of push-pull chromophores built around thiophene-based -conjugating spacers and bearingvarious types of amino donors and cyanovinyl acceptors have been analyzed by means of UV-vis-NIR, IR, and Raman spectroscopic measurements in the solid state as well as in solution. The intramolecularcharge transfer (ICT) of these -conjugated systems has also been tested by analyzing the ability of thesolute molecules to undergo shifts in their fluorescence emission maxima with increasing solvent polarity.These push-pull oligomers also display an attractive electrochemical behavior since they generate stablespecies both upon oxidation and reduction. Oxidation mainly involves changes in the electron-richaminooligothienyl half-part of the molecule and leads to the formation of stable cations. On the otherhand, reduction to radical anions and dianions is mainly cyanovinyl-centered but also affects the-conjugated electron relay. Density functional theory (DFT) calculations have been carried out to helpthe assignment of the most relevant electronic and vibrational features and to derive useful informationabout the molecular structure of these NLO-phores.