SYNTHESIS, NMR STUDIES AND CRYSTAL STRUCTURES OF 1,3-DIHYDRO-2δ4-BENZOTELLUROLE-2, 2-DIYL DIACETATE, C8H8Te(OAc)2 AND 1,3-DIHYDRO-2δ4-BENZOTELLUROLE-2,2-DIYL DIETHYLDITHIOCARBAMATE DIETHYLDITHIO-PHOSPHATE, C8H8Te(Et2NCS2)[(EtO)2PS2

Abstract

Abstract The crystal and molecular structures of C8H8Te(OAc)2, 1, and C8H8Te(Et2NCS2)[(EtO)2PS2], 2, have been determined. The crystals of 1 are monoclinic with a = 10.632(1), b = 9.200(1), c = 13.589(1) A, β = 101.330(6)°, Z = 4 and space group P21/a; the crystals of 2 are orthorhombic with a = 6.653(1), b = 9.876(2), c = 36.347(6) A, Z = 4 and space group P212121. In both compounds, the lone pair of electrons of tellurium is stereochemically active. In 1, tellurium is coordinated by the benzylic carbon atoms and by the four oxygens of the two anisobidentate acetate ligands. In addition, the molecules are joined into chains by weak intermolecular Te…O bonds. This results in seven-coordination for the tellurium atom. 2 consists of monomeric molecules where tellurium is bonded to the two benzylic carbons and to the four sulfur atoms of the two anisobidentate dithio ligands. Here, tellurium is six-coordinate. The structures may be described as distorted pseudo dodecahedral (1) and pseudo pentagonal bipyrami...