Dithienopyrrole as a Rigid Alternative to the Bithiophene π Relay in Chromophores with Second-Order Nonlinear Optical Properties
作者:A. Belén Marco、Natalia Martínez de Baroja、Santiago Franco、Javier Garín、Jesús Orduna、Belén Villacampa、Alejandro Revuelto、Raquel Andreu
DOI:10.1002/asia.201402870
日期:2015.1
4H‐Pyranylidene‐containing push‐pull chromophores built around a bithiophene (BT) π relay or a rigidified thiophene‐based unit, namely cyclopenta[1,2‐b:3,4‐b′]dithiophene (CPDT) or dithieno[3,2‐b:2′,3′‐d]pyrrole (DTP), have been synthesized and characterized. The effect of these different relays on the polarization and the second‐order nonlinear optical (NLO) properties has been studied. For the sake of
4 ħ -Pyranylidene含围绕双噻吩(BT)π继电器或僵化基于噻吩的单元,即环戊二烯并内置推挽生色团[1,2 b:3,4- b ']二噻吩(CPDT)或二噻吩并[已合成并表征了3,2‐ b:2',3'‐ d ]吡咯(DTP)。研究了这些不同继电器对偏振和二阶非线性光学(NLO)特性的影响。为了比较,报告了相应的dithieno [3,2‐ b:2′,3′‐ d噻吩(DTT)衍生物也已包括在讨论中。用加固单元(CPDT,DTP)替换BT核心会导致极化更多的系统。计算得出的NBO电荷和电化学测量结果表明,二噻吩并吡咯具有显着的施主特性,可以在施主和受主之间进行重要的电荷转移。BT中继的刚性对NLO响应的影响取决于受体强度。对于所使用的最薄弱的受体(硫代巴比妥酸),从BT中继到僵化单元传递总是涉及在增加μβ 0品质因数。然而,对于最强受体(2-二氰基亚甲基-3-氰基-1,4,5,5-三甲基-2