Synthesis, structure and properties of mercury complexes with a new extended tetrathiafulvalene 4,5-dithiolate ligand

摘要

A new extended tetrathiafulvalene (TTF) dithiolate ligand, benzotetrathiafulvalenedithiolate (btdt(2-)), together with mercury complexes based on it, have been synthesized and characterized by cyclic voltammetry, ESR, IR and magnetic susceptibility measurements. The crystal structure of (Me4N)(2)[Hg(btdt)(2)] (.) 4/3H(2)O (.) 2/3C(4)H(9)O (4) is determined, in which the central Hg atom is in an approximately tetrahedral coordination environment. Both ESR and cyclic voltammetry studies show that there is very little conjugating interaction between the two extended TTF dithiolate ligands. The neutral complex Hg(btdt)(2) (5) is prepared from 4 by oxidation with iodine. The electrical conductivity of 5 was measured as compressed pellets and the room temperature conductivity is 0.0015 S cm(-1). Magnetic susceptibility measurements reveal that complex 5 is a radical antiferromagnet. (c) 2005 Elsevier Ltd. All rights reserved.