Studies on tellurium-carbon bonded compounds: V. The crystal structure of 1,3-dimethylacetylacetone tellurium(II)

Abstract

The structure of the title compound has been determined by the heavy-atom method from 1349 reflections, measured with a diffractometer, and refined by full-matrix least-squares methods to R 0.044. Crystals are monoclinic, space group B 2 1/ c , a = 23.53(3), b = 4.85(1), c = 16.10(2) Å, β = 111.5(1)°, z = 8. In the molecules of the complex a tellurium(II) atom is bonded to one bivalent 1,3-dimethylacetylacetone ligand via the α-carbon atoms [Te-C 2.202(8), 2.157(8) Å; C-Te-C 88.4(3)°] forming a heterocyclic ring of chair conformation with both methyl substituents in equatorial positions. The molecules are arranged into one-dimensional zig-zag polymers, about the 2 1 axes at x = 1 4 or 3 4 and z = 0 or 1 2 , by associations between the tellurium atoms. These associations have been observed in other compounds studied in previous parts of this series and the implications of these associations with regard to the colour of this and related tellurium compounds are investigated in the light of current theories. All hydrogen atoms have been located.