Organyltellurium-(IV) and -(II) dithiocarbamates: crystal and molecular structure of dimethyldithiocarbamato(2-phenylazophenyl-C,N′)tellurium(II)
Abstract
The synthesis of the (2-phenylazophenyl-C,N′)tellurium(II) dithiocarbamates TeII(C6H4N2Ph)(dtc)(dtc = dimethyl-, diethyl-, or dibenzyl-dithiocarbamate) is reported. The corresponding series of tris compounds, Te(C6H4N2Ph)(dtc)3 is also reported. 125Te N.m.r. data indicate that the tris compounds dissociate to tellurium(II) compounds in solution and 125Te Mossbauer data suggest that the tris compounds are better formulated as loose charge-transfer compounds TeII(C6H4N2Ph)(dtc)·R′2NC(S)S–S(S)CNR′2(R′= Me, Et, or CH2Ph). The crystal and molecular structure of dimethyldithiocarbamato(2-phenylazophenyl-C,N′)tellurium(II) has been determined. The compound crystallises in the monoclinic centrosymmetric space group P21/n with a= 6.225(5), b= 12.133(9), c= 21.784(14)Å, β= 92.88(5)°, and Z= 4. The refinement converged to R= 0.0517. Tellurium is in a distorted planar environment with Te–C 2.101(8), Te–N 2.340(7), Te–S 2.568(2)Å, and Te ⋯ S 3.255(3)Å. Bond angles include STeS 60.9(1), STeC 89.8(2), CTeN 72.5(3), and NTeS 136.3(2)°. No significant intermolecular contacts are observed.