Syntheses, Unique Strained Molecular Structures, and Unusual Transannular Electronic Interactions of a Series of Crisscross-Overlapped Tetrathiafulvalenophanes
摘要:
A series of novel tetrathiafulvalenophanes has been synthesized, in which two tetrathiafulvalenes (TTF) are linked in a crisscross-overlapped arrangement by four alkylenedithio bridges. Their molecular structures were elucidated by X-ray crystal analyses, being characterized by the bent TTF skeletons as well as the unique stacking mode. The degree of the bend largely depends on both the length and conformational rigidity of the alkylenedithio chains. The short and rigid chains induce severe bending, which brings about a hypsochromical effect in the electronic absorption spectra. On the other hand, the long and flexible chains reduce the strain and make an inside cavity large enough to include a guest molecule. In addition, the less strained compounds can effect an intramolecular transannular Coulombic interaction between their two TTF units in solution, as demonstrated by multistage redox waves in the cyclic voltammograms. All the radical cation salts formed from these tetrathiafulvalenophanes have conductivities of the same order of 10(-6)-10(-7) S cm(-1), which are apparently independent of the donor and the counterion species.
Oligomeric Tetrathiafulvalenes: Stable Caesium Tetrathiafulvalene- and 1,3-Dithiole-2-thionethiolates as Intermediates in the Synthesis of Pentakis(tetrathiafulvalenes)
作者:Jesper Lau、Ole Simonsen、Jan Becher
DOI:10.1055/s-1995-3941
日期:1995.5
Synthesis of stable caesium salts of tetrathiafulvalene- and 1,3-dithiole-2-thionethiolates and their reaction with tetrakis(iodoalkylthio)tetrathiafulvalene to produce pentakis(tetrathiafulvalenes) is presented. X-ray structure of the caesium salt of 1,3-dithiole-2-thione-5-methoxycarbonyl-4-thiolate reveals a highly conjugated system.
介绍了四硫富戊烯和 1,3-二硫代-2-硫代硫醇的稳定铯盐的合成及其与四(碘烷基硫基)四硫富戊烯反应生成五(四硫富戊烯)的过程。1,3- 二硫代-2-硫酮-5-甲氧羰基-4-硫代酸铯盐的 X 射线结构显示了一个高度共轭的体系。