The Influence of Terminal Push-Pull Substitution on the Electronic Structure and Optical Properties of Pentacenes
作者:Christina Tönshoff、Holger F. Bettinger
DOI:10.1002/chem.201101036
日期:2012.2.6
The synthesis of 2,3‐R2‐9,10‐(OMe)2‐substituted pentacenes (R=OMe, F, Br, CN; 1–4) from 2,3‐R2‐9,10‐dimethoxy‐6,13‐dihydro‐6,13‐ethanopentacene‐15,16‐diones (α‐diketone‐bridged precursors) by photochemically induced bis‐decarbonylation (Strating–Zwanenburg reaction) is described. Under matrix‐isolation conditions (solid Ar, 10 K) the S1 transitions of 1 and 2 undergo hypsochromic and those of 3 and
2,3-R的合成2 -9,10-(OME)2 ;取代的并五苯(R = OME,F,溴,CN 1 - 4由2,3--R)2 -9,10-二甲氧基描述了通过光化学诱导的双脱羰基作用(Strating-Zwanenburg反应)的6,13-dihydro-6,13-ethanopentacene-15,16-diones(α-二酮桥连的前体)。与母并五苯相比,在基质隔离条件下(固体Ar,10 K),S 1跃迁1和2经历了变色,而S 1跃迁发生了3和4红移。S 1跃迁波长与取代基参数σ的相关性很好p。在CAM‐B3LYP / 6‐311 + G **理论水平上的激发态的计算分析提供了电子跃迁的分配。室温下溶液中的光解产生红色[R = OMe(1)],蓝色[R = Br(3),F(2)]和绿色[R = CN(4)]并五苯。这些化合物对氧敏感,溶解度低,但是可以通过UV / Vis监测其形成,在R