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The crystal and molecular structures of bis(n-propyldithiocarbonato)tellurium (II), [Te(S 2 COnPr) 2 ] ( 1 ), C 8 H 14 O 2 S 4 Te, and bis(3,3-dimethylbutyldithiocarbonato)tellurium(II), [Te(S 2 COCH 2 CH 2 CMe 3 ) 2 ] ( 2 ), C 14 H 26 O 2 S 4 Te, have been determined at room temperature. The red crystals of  1  are monoclinic, space group  P 2 1  with unit cell dimensions  a  = 10.501(6) Å,  b  = 5.973(3) Å,  c  = 12.055(1) Å,  β  = 102.39(2)°,  Z  = 2 and  D  x  = 1.790Mg m −3 . The red crystals of  2  are also monoclinic, space group  P 2 1 / c  with unit cell dimensions  a  = 16.744(6) Å,  b  = 6.098(4) Å,  c  = 21.334(3) Å,  β  = 104.89(2)°,  Z  = 4 and  D  x  = 1.521Mg m −3 . The structures were solved by direct methods and each refined by a full-matrix least-squares procedure to final  R  = 0.046 using 1314 reflections for  1  and to final  R  = 0.061 using 1194 reflections for  2 . The molecular structures are similar and each feature two asymmetrically coordinating xanthate ligands that define a trapezoidal planar coordination geometry about the tellurium(II) center; the lone pairs of electrons are thought to lie over the weaker Te–S interactions. Each of the crystal structures is stabilised by supramolecular Te…S interactions.

The crystal and molecular structures of [Te(S 2 COR) 2 ], R = nPr and CH 2 CH 2 CMe 3