Synthesis, characterization and crystal structure of 1,3-dihydro-2λ4-benzotellurole-2,2-diyl bis(N-piperidine-dithiocarbamate), [1,2-C6H4(CH2)2Te(S2CNC5H10)2] (1), 1,3 dihydro-2λ4-benzotellurole-2-iodo-2-yl-diethyldithiophosphinate, [1,2-C6H4(CH2)2TeI(S2PEt2)] (2) and 1,3-dihydro-2λ4-benzotellurole-2-iodo-2-yl-dimethyldithiophosphinate, [1,2-C6H4(CH2)2TeI(S2PMe2)] (3)

Three new 1,1-dithiolato organoyltellurium( IV) compounds were synthesized, [1.2-C6H4(CH2)(2)Te(S2CNC5H10)(2)] (1), [1,2-C6H4(CH2)(2)TeI(S2PEt2)] (2), and [1,2-C6H4(CH2)(2)TeI(S2PMe2)] (3). They have been characterized by means of IR,H-1, C-13, P-31 NMR spectroscopy, positive-ion FAB mass spectrometry, elemental analysis and single-crystal X-ray diffractomery. The 1,1-dithiolato ligands display an anisobidentate chelating coordination mode on interacting with the tellurium centre. Two 1,1-piperidindithiocarbamates are attached to the tellurium atom in I, while a iodine atom and only one 1,1-dialkyldithiophosphinate are bonded to Te in compounds 2 and 3. The solid state structures show that the compounds 2 and 3 exhibits important intermolecular interactions (Te . . .I(b) for 2 and Te . . .S(b) for 3). These interactions result in the formation of a dimer in 2, and of a one-dimensional polymer in 3. Compound I shows weaker intermolecular Te . . .S(b) interactions. (C) 2001 Elsevier Science B.V. All rights reserved.