Studies on tellurium–carbon bonded compounds. III. The crystal structure of acetylacetone tellurium(II)

Abstract

The structure of the title compound has been determined by the heavy-atom method from 685 reflexions, measured with a diffractometer, and refined by full-matrix least-squares methods to R 3-4%. Crystals are orthorhombic, space group Iba2, a = 22.35 (3), b = 10.78 (2), c = 5.26 (1) A, Z = 8. In the molecules of the complex a Ten atom is bonded to one bivalent acetylacetone ligand via the a-C atoms ITe-C 2.17 (1), 2.15 (1) A; C-Te--C 90.8 (4) °] forming a heterocyclic ring of chair conformation. The molecules are arranged into one-dimensional polymers parallel to [0011 by associations between the Te atoms; the implications of these associations with regard to the colour of this and related tellurium compounds are discussed in the light of present theories. H atoms could not be located.