Synthesis, Reactivity, and Structural Characterization of the Nonclassical [MTe7]n- Anions (M = Ag, Au, n = 3; M = Hg, n = 2)

Donna M. Smith, Lisa C. Roof, Mohammad A. Ansari, Jonathan M. McConnachie, John C. Bollinger, Michael A. Pell, Robert J. Salm, James A. Ibers*

*Corresponding author for this work

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29 Scopus citations

Abstract

Several tellurometalates of the general formula [MTe7]n- (n = 2, 3) have been isolated as salts of organic cations by reaction of suitable metal sources with polytelluride solutions in DMF. The [HgTe7]2- anion has the same structure in both the NEt4+ and the PPh4+ salts except for a minor change in the ligand conformation. The [AgTe7]3- and [HgTe7]2- anions contain metal atoms coordinated in trigonal-planar fashion to η3-Te74- ligands. The central Te atom of an η3-Te74- ligand is coordinated to the metal atom and to two Te atoms in a "T"-shaped geometry consistent with a hypervalent 10 e- center. The planar [AuTe7]3- anion may best be described as possessing a square-planar AuIII atom coordinated to an η3-Te54- ligand and to an η1-Te22- ligand. The reaction of [NEt4]n[MTe7] (M = Hg, n = 2; M = Au, n = 3) with the activated acetylene dimethyl acetylenedicarboxylate (DMAD) has yielded the products [NEt4]n[M(Te2C2(COOCH 3)2)2] (M = Hg, n = 2; M = Au, n = 1). The metal atoms are coordinated to two Te(COOCH3)C=C(COOCH3)Te2- ligands, for M = Hg in a distorted tetrahedral fashion and for M = Au in a square-planar fashion.

Original languageEnglish (US)
Pages (from-to)4999-5006
Number of pages8
JournalInorganic chemistry
Volume35
Issue number17
DOIs
StatePublished - Jan 1 1996

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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