Synthesis, structure and properties of the polychalcogenides [M4Te12]4- (M=Cd, Hg)

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Abstract

The cluster anions, [M4Te12]4- (MCd, Hg) are reported. (Et4N)4[Cd4Te12] (I) was prepared by the reaction of CdI2, K2Te2 and Et4NBr in a 2:3:2 molar ratio, in DMF. I crystallizes in the orthorhombic space group Cmca (No. 64) with a = 15.482(5), b = 22.563(4), c = 18.027(4) Å, V = 6297(5) Å3 and Z = 4. The black rectangular platelet crystals of (Me4N)4[Hg4Te12] (II) were obtained from the reaction of HgCl2 and K2Te in a 2:5 molar ratio in DMF. II crystallizes in the monoclinic space group P21/n (No. 14) with a = 10.324(3), b = 21.851(6), c = 11.125(4) Å, β = 110.63(3)°, V = 2348(3) Å3 and Z = 2. [M4Te12]4- is a cluster with two Te2-, two Te22- and two Te32- ligands connecting a planar array of four tetrahedral M2+ metal centers. Its shape may be described as a basket, consisting of an {M4(Te2)2Te2} core with two side Te32- handles. The average M-Te and Te-Te distances are 2.85(8) and 2.74(2) Å for I, respectively, and 2.86(12) and 2.73(1) Å for II, respectively. The far-IR spectra show two absorptions at 173 and 160 cm-1 for I and at 167 and 148 cm-1 for II. Thermal gravimetric analysis data are reported.

Original languageEnglish
Pages (from-to)163-169
Number of pages7
JournalInorganica Chimica Acta
Volume224
Issue number1-2
DOIs
Publication statusPublished - Oct 1994

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Keywords

  • Crystal structures
  • Polychalcogenide complexes
  • Tellurium complexes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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