Synthesis, Structure, and Transport Properties of Ta2NiSe7 and Ta2PtSe7

Steven A. Sunshine, James A. Ibers

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The new layered ternary chalcogenides Ta2NiSe7 and Ta2PtSe7 have been prepared and characterized. These compounds crystallize in the monoclinic space group with four formula units in the cell (for Ta2NiSe7a = 13.827 (3) A, b = 3.482 (1) A, c = 18.577 (4) A, and β = 108.80 (1)° and for Ta2PtSe7a = 13.954 (13) Å, b- 3.530 (3) A, c = 18.694 (17) A, and β = 109.28 (3)°, both at -150 °C). The layers are comprised of Ta atoms in octahedral and bicapped-trigonal-prismatic chalcogen environments and Ni or Pt atoms in octahedral sites. Each Ni or Pt atom is shifted from the center of the octahedron toward one apex, resulting in square-pyramidal coordination. The structure contains one Se-Se pair (d = 2.549 (3) A for Ta2NiSe7 and d = 2.597 (4) A for Ta2PtSe7) in each trigonal prism of Se atoms. The transport properties of Ta2NiSe7 reveal that this material is metallic (σrt= 310 Ω-1 cm-1) and diamagnetic (xrt = -1.54X 10-7emu g-1).

Original languageEnglish (US)
Pages (from-to)4355-4358
Number of pages4
JournalInorganic chemistry
Issue number24
StatePublished - 1986

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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