New 3-Ethynylaryl Coumarin-Based Dyes for DSSC Applications: Synthesis, Spectroscopic Properties, and Theoretical Calculations
作者:João Sarrato、Ana Lucia Pinto、Gabriela Malta、Eva G. Röck、João Pina、João Carlos Lima、A. Jorge Parola、Paula S. Branco
DOI:10.3390/molecules26102934
日期:——
steps for extension of the conjugated system involved Sonogashira reaction yielding highly fluorescent molecules. Spectroscopic characterization showed that the extension of conjugation via the alkynyl bridge resulted in a strong red-shift of absorption and emission spectra (in solution) of approximately 73–79 nm and 52–89 nm, respectively, relative to 6,7-dimethoxy-4-methylcoumarin (labs = 341 nm and
一组带有单,联噻吩和稠合变体thieno的3-乙炔基香豆素染料[3,2- b制备噻吩以及烷基化的苯并三唑单元,并对其进行染料敏化太阳能电池(DSSC)的测试。为了比较,使用天然产物6,7-二羟基香豆素(Esculetin)以及5,7-二羟基香豆素(在联噻吩染料的情况下)分析了香豆素单元上取代模式的变化。扩展共轭体系的关键步骤涉及Sonogashira反应,产生高度荧光的分子。光谱表征表明,通过炔基桥的共轭扩展导致吸收和发射光谱(在溶液中)的强烈红移(相对于6,7-二甲氧基-分别约为73-79 nm和52-89 nm)。 4-甲基香豆素(l abs = 341 nm和l em= 410 nm)。理论密度泛函理论(DFT)计算表明,最低未占据分子轨道(LUMO)主要位于氰基丙烯酸锚单元中,从而证实了电子跃迁的高分子内电荷转移(ICT)特性。光伏性能评估显示,染料8中存在的噻吩并[3,2- b