The title compound (1a) and its related unsymmetrical derivatives were prepared as new donors for organic conductors, and electrochemical properties and crystal structure of 1a were investigated. Several charge-transfer complexes and cation radical salts using them showed metallic temperature dependence of conductivity down to ca. 100 K.
Preparations and Sulfurization Reactions of (2,4-Di-<i>t</i>-butyl-6-methoxyphenyl)phosphine and 1-(2,4-Di-<i>t</i>-butyl-6-methoxyphenyl)-2-(2,4,6-tri-<i>t</i>-butylphenyl)diphosphene
A phosphonous dichloride carrying 2,4-di-t-butyl-6-methoxyphenyl as a novel sterically protecting group was prepared and converted to an unsymmetrical diphosphene, which reacted with sulfur to give the corresponding diphosphene sulfide and thiadiphosphirane. The phosphonous dichloride was reduced to the corresponding primary phosphine, which was sulfurized to a dithioxophosphorane. The dithioxophosphorane reacted with benzophenone to give thiobenzophenone.
The title compounds were prepared and their electrochemical properties were investigated. Several cation radical salts composed of them showed metallic conductive behavior down to 0.6 K. The X-ray crystal structure of AsF6 salt of ethylenedithio derivative, (EOET-TTP)3AsF6, revealed that the donors have “κ-type” arrangement in the conducting sheet.
制备了标题化合物并研究了它们的电化学特性。乙二硫衍生物 AsF6 盐 (EOET-TTP)3AsF6 的 X 射线晶体结构显示,供体在导电片中呈 "κ型 "排列。
Preparation, crystal structure and electrical properties of dimethyl substituted unsymmetrical 2,5-bis(1′,3′-dithiol-2′-ylidene)-1,3,4,6-tetrathiapentalenes
Preparation, crystalstructure and electrical properties of the title compounds 1a–g are described; these donors gave several conducting salts showing metallic temperature dependence.
unsymmetrically substituted TTF derivatives as precursor for the preparation of novel TTF-based donor-bridge-acceptor dyads is reported. Substitution on the acceptor p-benzoquinone moiety has a strong influence on the reduction potentials in compounds 18 which, however, do not show the presence of a charge transfer band in the electronic spectra. The cyclic voltammetry measurements reveal two oxidation waves