Selenium analogues of TMET-TTP (2-(4,5-bisthiomethyl-1,3-dithiol-2-ylidene)-5-(4,5-ethylenedithio-1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) 1b-d have been synthesized. The iodine salt (1b)4I3 exhibits moderately high conductivity (σrt=13S cm−1) with semiconducting temperature dependence, and the donor arrangement is θ-type. The present θ-type salt as well as TMET-TTP salts is located at the insulating limit in the universal phase diagram of θ-phases.
Bis-fused TTF(tetrathiafulvalene) derivatives with a cyclohexane ring 1a-c have been synthesized. One of their radical-cation salts (1b)2Au(CN)2 exhibits high conductivity σrt=160 Scm−1 and is metallic down to 120 K. Its structure consists of weakly dimerized columns with relatively small intercolumnar interactions.
Two-Dimensional Brickblock Arrangement in Bis-Fused Tetrathiafulvalene Semiconductors
作者:Takeshi Terauchi、Satoshi Sumi、Yuka Kobayashi、Yoshitaka Matsushita、Akira Sato
DOI:10.1021/cg401883g
日期:2014.3.5
Molecular packing arrangement is a very important factor in the charge carrier mobility of organic semiconductors, but its rational design has not been established as yet. Two-dimensional (2D) lamellar packing is an advantageous arrangement for high charge mobility, but few examples have been reported thus far. Herein we show crystal structures and the electronic properties of newly designed bis-fused tetrathiafulvalene (TTF) semiconductors with hetero substituent groups with distinct electronic effects. Unprecedented 2D lamellar alignment is achieved in a single crystal, where the bis-fused TTF rings interact three dimensionally with face-to-face and side-by-side intermolecular S center dot center dot center dot S contacts up to a total of 20 sites per pi molecule and form graphitelike "brickblock" structure. The charge mobility of a single crystal is as high as 0.78 cm(2) V-1 s(-1). Systematic investigations of the semiconductors reveal a key role of intramolecular S center dot center dot center dot O interaction between a bis-fused TTF ring and a methoxycarbonyl group in controlling efficient arrangement, leading to high mobility.
Stereochemically ordered donor columns in an organic conductor, (Et2BEDT-TTP)2HgI3
A new diethyl-substituted organic donor, Et2BEDT-TTP, has been synthesized. The radical-cation salt, (Et2BEDT-TTP)(2)HgI3 has a unique crystal structure where the stereochemical cis- and rrans-isomers are arranged regularly to make tetramerized columns. (C) 2001 Elsevier Science Ltd. All rights reserved.