Synthesis, structures and electrical properties of the charge-transfer salts of 4,5-ethylenedithio-4′,5′-(2-oxatrimethylenedithio)diselenadithiafulvalene (EOST) with linear anions [I–3, IBr–2, ICl–2, I<sub>2</sub>Br<sup>–</sup>, AuBr–2, Au(CN)–2]
作者:Toshio Naito、Akiko Tateno、Takashi Udagawa、Hayao Kobayashi、Reizo Kato、Akiko Kobayashi、Takashi Nogami
DOI:10.1039/ft9949000763
日期:——
An unsymmetrical donor 4,5-ethylenedithio-4â²,5â²-(2-oxatrimethylenedithio)-diselenadithiafulvalene (EOST)â has been synthesized. Single crystals of some charge-transfer salts of EOST have been prepared electrochemically. The crystal structures of EOST and its charge-transfer salts were analysed by X-ray crystallography. The dc resistivities were measured on the single crystals. Eight of the salts with linear anions [(EOST)2I3, α-(EOST)2IBr2, β-type IBr2 salt, (EOST)2ICl2, (EOST)2I2Br, α- and β-type AuBr2 salts and Au(CN)2 salt] retained their metallic conductivity down to low temperatures (⩽ 35 K) and some were found to be isostructural. The overlap integrals of some salts and the tight-binding band was examined for (EOST)2I3. The result suggested that it has a quasi-one-dimensional electronic structure and that EOST molecules interact most strongly in a side-by-side direction. The crystal and electronic structures of (EOST)2I3 are discussed by comparison with the isostructural compound (EOTT)2IBr2[EOTT: 4,5-ethylenedithio-4â²,5â²-(2-oxatrimethylenedithio) tetrathiafulvalene].
合成了非对称给体4,5-乙撑二硫-4',5'-(2-恶二甲撑二硫)-二硒二硫富瓦烯(EOST)。用化学法制备了EOST的部分电荷转移盐单晶。用X射线晶体学方法分析了EOST及其电荷转移盐的晶体结构。在单晶上测定了电阻率。8种具有线型阴离子的盐[(EOST)_2I_3,α-(EOST)_2IBr_2,β-型IBr_2盐,(EOST)_2ICl_2,(EOST)_2I_2Br,α-型和β·型AuBr_2盐和Au(CN)_2盐]在低温(≤35K)下保持了金属导电性,某些盐是同构的。对(EOST)_2I_3考查了某些盐的重叠积分和紧束缚能带,结果表明它具有准一维电子结构。EOST分子之间在肩并肩方向上有最强的相互作用。通过与同构化合物(EOTT)_2IBr_2[EOTT:4,5-乙撑二硫-4',5'-(2-恶二甲撑二硫)四硫富瓦烯]相比较,讨论了(EOST)_2I_3的晶体结构和电子结构。