A bis-fused donor composed of TTF vinylogues, 2,5-bis (2 -ethanediylidene -1,3-dithiole)-1,3,4,6-tetrathiapentalene (BisEDT, la) and its derivatives have been synthesized. Cyclic voltammograms of 1 consist of four-pairs of one-electron redox waves. X-ray structure analysis of tetrakis(methylthio)-1 (1b) reveals the donor adopts almost planar structure. The TCNQF 4 complexes of 1 showed moderate conductivity
已经合成了由 TTF 乙烯基化合物、2,5-双(2-乙二亚基-1,3-二硫醇)-1,3,4,6-四硫戊烯(BisEDT,la)及其衍生物组成的双稠合供体。1 的循环伏安图由四对单电子氧化还原波组成。四(甲硫基)-1 (1b) 的 X 射线结构分析显示供体采用几乎平面结构。1 的 TCNQF 4 复合物在压缩颗粒上显示出 σ rt = 10 -2 S cm -1 的中等电导率。
Tuning First Molecular Hyperpolarizabilities through the Use of Proaromatic Spacers
作者:Raquel Andreu、Maria Jesús Blesa、Laura Carrasquer、Javier Garín、Jesús Orduna、Belén Villacampa、Rafael Alcalá、Juan Casado、Mari Carmen Ruiz Delgado、Juan T. López Navarrete、Magali Allain
DOI:10.1021/ja051819l
日期:2005.6.1
In this paper, we describe the second-order nonlinear optical properties of a series of 1,3-dithiolebased electron donor-acceptor systems incorporating proaromatic donor and spacer groups. Modification of the proaromaticity of the quinoid spacer gives rise to NLO-phores with mu beta values ranging from -2000 X 10(-48) esu to +3000 x 10(-48) esu. Quite surprisingly, compounds with a p-benzoquinoid spacer and a strong acceptor group show negative mu beta values, usually associated to zwitterionic ground states, and yet they are largely quinoid, as evidenced by crystallographic data and theoretical calculations. Progressive benzoannulation of the spacer and introduction of alkylsulfanyl substituents on the dithiole donor unit result in a shift to more positive mu beta values. DFT and ab initio calculations verify these empirical trends.
The phosphoramidate-like reaction of 1,3-dithiole derived N-(diethoxyphosphinyl)hydrazones with formyl derivatives of 1,3-dithiole affords the longest aza-analogues of extended tetrathiafulvalenes with a polyenic spacer reported to date. Their structural and electrochemical properties are discussed. (C) 2004 Elsevier Ltd. All rights reserved.