Synthesis, Structures and Nonlinear Optical Properties of Novel D−π−A Chromophores: Intramolecular Charge Transfer from 1,3-Dithiole or Ferrocene Moieties to Polynitrofluorene or Dicyanomethylene Moieties through Conjugated Linkers
作者:Adrian J. Moore、Antony Chesney、Martin R. Bryce、Andrei S. Batsanov、Janet F. Kelly、Judith A. K. Howard、Igor F. Perepichka、Dmitrii F. Perepichka、Guilia Meshulam、Garry Berkovic、Zvi Kotler、Royi Mazor、Vladimir Khodorkovsky
DOI:10.1002/1099-0690(200107)2001:14<2671::aid-ejoc2671>3.0.co;2-3
日期:2001.7
terminal moiety in this context. The molecular and electronic structures of 49 and 50 have been calculated by the RHF/6-31G(d)//RHF/6-31G(d) ab initio method. The HOMO is located mostly in the 1,3-dithiolium ring, and the LUMO mostly at the dicyanomethylene fragment (and the phenyl ring of 50) although the electronic population at C2 of the 1,3-dithiolium rings is also considerable. The X-ray crystal structures
电子供体-π-受体发色团 5、9、11、18-20、21、22、27、28a、28c、31、32、34-36、38a-c、41a、41c 和 42 已被合成。供体单位是1,3-二硫醇和二茂铁;共轭亚乙基、苯基、亚苯基亚乙烯基、噻吩基、联噻吩基、三噻吩基或噻吩基亚乙烯基连接体作为中心 π 电子中继单元,二氰基亚甲基和聚硝基芴基团作为受体单元。电子吸收光谱在可见光区 (500−700 nm) 显示出宽的低能分子内电荷转移带,其中能量 (hνICT ≈ 1.7−2.5 eV) 和强度 (ϵ ≈ 5000−50000 M−1cm−1)主要取决于 D 和 A 部分的性质以及接头单元的结构。使用 EFISH 技术评估了非线性光学特性:在 38b [(900±300)×10−48 esu] 和 42 [(1800±300)×10−48 esu] 中观察到最高的 μβ(0) 值,表明聚硝基芴是一种有前途的受体末端部分。49