Vibrational and Quantum-Chemical Study of Nonlinear Optical Chromophores Containing Dithienothiophene as the Electron Relay
作者:Juan Casado、Víctor Hernández、Oh-Kil Kim、Jean-Marie Lehn、Juan T. López Navarrete、Salvador Delgado Ledesma、Rocío Ponce Ortiz、Mari Carmen Ruiz Delgado、Yolanda Vida、E. Pérez-Inestrosa
DOI:10.1002/chem.200305752
日期:2004.8.6
A series of nonlinear optical (NLO) donor-acceptor (D-A) chromophores containing a fused terthiophene, namely dithienothiophene (DTT), as the electron relay, the same donor group, and acceptors of various strengths, has been investigated by means of infrared and Raman spectroscopies, both in the solid state as well as in a variety of solvents, to evaluate the effectiveness of the intramolecular charge
已经通过红外和红外光谱研究了一系列非线性光学(NLO)供体-受体(DA)发色团,其中包含稠合的对噻吩即二噻吩并噻吩(DTT)作为电子继电器,相同的供体基团和各种强度的受体。拉曼光谱法,无论是在固态还是在各种溶剂中,均能评估分子内电荷从电子供体向电子受体端基转移的有效性。已经发现,从它们的稀溶液中测得的这些NLO-phor的拉曼光谱图与相应的固体相当,因此它们的分子内电荷转移(ICT)对溶剂极性的依赖性很小。对于含DTT的4-(N,N-二丁基氨基)苯乙烯基端基作为供体,而2,2-二氰基乙烯-1-基端基作为受体,与先前从两个具有相同DA对但在周围形成的亲本“推挽”生色团获得的那些不同。双(3,4-亚乙二氧基噻吩基)(BEDOT)或双噻吩基(BT)电子中继器。振动光谱表明,DTT作为电子中继的效率显着高于BT(具有相同数量的共轭C = C键)或BEDOT(由于杂原子之间非共价分子内相互作用而被视