A novel mixed ligand Te(IV) complex comprising three halides and a dithiocarbamate; synthesis and crystal structure of triiododiethyldithiocarbamatotellurium(IV), Te{(C2H5)2NCS2}I3

Abstract The title compound Te IV LI 3 [L = diethyldithiocarbamate, (C 2 H 5 ) 2 NCS − 2 ], is the first example of a mixed halide-dithiocarbamate complex of Te IV with halide to a dithiocarbamate ratio of 3:1. Two different methods have been employed for the preparation of this compound. The first method involves the ligand exchange reaction between TeL 2 and TeI 4 . The second method is the oxidative addition of iodine on Te II LI. The structure of the title compound has been determined and it is found to be polymeric with iodine being the bridging ligand. The polymer is made up of interlinking of edge-sharing pentagonal bipyramidal dimers, which are stacked along a axis of the triclinic unit cell. The three TeI distances are TeI (1) 2.982 (1), TeI (2) 2.90 (1) and TeI (3) 2.872 (1) A, and together with two TeS and two intermolecular TeI interactions complete the seven coordination with a distorted pentagonal bipyramidal geometry around each tellurium.