Platinum bronzes. II. Crystal structures of calcium platinum oxide (CaPt2O4) and cadmium platinum oxide (Cd0.3Pt3O4)

David Cahen, James A. Ibers, Melvin H. Mueller

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The crystal structures of CaPt2O4 and Cd0.3Pt3O4have been determined from X-ray and neutron diffraction powder data. Refinement of both X-ray and neutron intensity data led to final weighted and unweighted agreement indices of 24.6 and 16.0% for CaPt2O4and 6.8 and 9.8% for the simpler Cd0.3Pt3O4. CaPt2O4has a structure that is the two-dimensional analog of the general platinum bronze structure. It crystallizes in space group D4h 9-P42/mmc of the tetragonal system with two formula units in a cell of dimensions a = 5.7786 (5) Å and c = 5.5989 (7) Å. The structure appears to be a unique one involving nonintersecting Pt chains in the x and y directions. Pt chain compounds in one and three dimensions are known and CaPt2O4 forms the missing two-dimensional link. Cd0.3Pt3O4 possesses the NiPt3O4 structure involving Pt chains in the x, y, and z directions. It crystallizes in space group Oh3-Pm3n of the cubic system with two formula units in a cell with a cell edge of 5.6423 (4) Å. The unusual formal oxidation states of Pt in both compounds are explained by extensive metallic bonding between the Pt atoms.

Original languageEnglish (US)
Pages (from-to)110-115
Number of pages6
JournalInorganic chemistry
Volume13
Issue number1
DOIs
StatePublished - Jan 1 1974

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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