APdCu(Se2)(Se3) (A = K and Rb): New quaternary copper palladium polyselenides with unusual metal-selenium coordination

Xuean Chen, Kieran J. Dilks, Xiaoying Huang, Jing Li

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Abstract

Two novel metal polyselenides, KPdCu(Se2)(Se3) (I) and RbPdCu(Se2)(Se3) (II), have been synthesized from solvothermal reactions in superheated ethylenediamine at 160 °C. The isostructural compounds crystallize in the monoclinic space group P21/m, Z = 2, with a = 6.145(1) Å, b = 7.268(1) Å, c = 8.865(2) Å, β = 102.41(3)° for I, and a = 6.253(1) Å, b = 7.267(1) Å, c = 8.993(2) Å, β = 102.28(3)° for II. Their crystal structures are two-dimensional networks with 2[PdCu(Se2) (Se3)]- anionic layers built from one-dimensional 1[Pd(Se2) (Se3)]2- "chains" that are "stitched" together by tetrahedrally coordinated Cu atoms. The DSC data show that I and II are stable up to 400 °C and decompose at ca. 436 and 424 °C, respectively. Both compounds are narrow band-gap semiconductors with estimated band gaps of about 0.7 eV (I) and 0.8 eV (II), respectively. They are the first structurally characterized quaternary copper palladium polychalcogenides with a (Se2)2- and a (Se3)2- fragment, both exhibiting interesting and unusual metal-selenium coordination.

Original languageEnglish
Pages (from-to)3723-3727
Number of pages5
JournalInorganic Chemistry
Volume42
Issue number12
DOIs
Publication statusPublished - Jun 16 2003

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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