Tetrathiapentalene type donors as promising π-electron frameworks for organic metals stable down to low temperatures

Abstract

A bis-fused TTF donor, 2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene (TTP) and its derivatives affords many metallic salts stable down to low temperatures. X-Ray structure analysis reveals that most TTP salts have β-type conducting sheets regardless of counter anions. On the other hand, CH-TTP and TMET-TTP have a tendency to form κ-type and θ-type salts, respectively. A vinylogous TTP, DTEDT has afforded an organic superconductor (DTEDT) 3 Au(CN) 2 , and a TTP analog containing thiopyran ring TM-TPDS has yielded the AsF 6 salt with three-dimensional molecular array.