Intervalence Transitions in the Mixed-Valence Monocations of Bis(triarylamines) Linked with Vinylene and Phenylene−Vinylene Bridges
作者:Stephen Barlow、Chad Risko、Sung-Jae Chung、Neil M. Tucker、Veaceslav Coropceanu、Simon C. Jones、Zerubba Levi、Jean-Luc Brédas、Seth R. Marder
DOI:10.1021/ja054136e
日期:2005.12.1
hexachloroantimonate. The intervalence charge-transfer (IVCT) band of 1(+) is narrow and asymmetric and exhibits only weak solvatochromism. Analysis of this band indicates that 1(+) is a class-III or class-II/III borderline mixed-valence species. In contrast, a broad, strongly solvatochromic IVCT band is observed for 2(+), indicating that this species is a class-II mixed-valence species. The assignment
(E)-4,4'-双[双(4-甲氧基苯基)氨基]二苯乙烯,1,(E,E)-1,4-双[4-[双(4-甲氧基苯基)氨基]苯乙烯基]苯, 2,和两个更长的同系物,(E,E,E)-4,4'-双[4-[双(4-甲氧基苯基)氨基]苯乙烯基]二苯乙烯,3和(E,E,E,E)- 1,4-双(4-[4-[双(4-甲氧基苯基)氨基]苯乙烯基]苯乙烯基)苯, 4, 已被三(4-溴苯基) 六氯锑酸盐氧化成单和二价。1(+) 的间隔电荷转移 (IVCT) 带窄且不对称,仅表现出微弱的溶剂化变色。对该条带的分析表明 1(+) 是 III 类或 II/III 类临界混合价物种。相比之下,对于 2(+) 观察到一个宽的、强溶剂化变色的 IVCT 带,表明该物种是 II 类混合价物种。将 1(+) 和 2(+) 指定为对称的 III 类和不对称的 II 类物种,AM1 计算也支持。1(+) 和 2(+) 的 IVCT 带的静寂分析给出了更大的电子耦合