Synthesis, Structure, and Transport Properties of Ta2NiSe7 and Ta2PtSe7

Steven A. Sunshine; James A. Ibers

doi:10.1021/ic00244a014

Synthesis, Structure, and Transport Properties of Ta₂NiSe₇ and Ta₂PtSe₇

Steven A. Sunshine, James A. Ibers

Chemistry

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Abstract

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 (σ_rt= 310 Ω^-1 cm^-1) and diamagnetic (x_rt ⁼ ^-1.54X 10^-7emu g^-1).

Original language	English (US)
Pages (from-to)	4355-4358
Number of pages	4
Journal	Inorganic chemistry
Volume	25
Issue number	24
DOIs	https://doi.org/10.1021/ic00244a014
State	Published - 1986

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Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "Synthesis, Structure, and Transport Properties of Ta2NiSe7 and Ta2PtSe7",

abstract = "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) {\AA}, 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).",

author = "Sunshine, {Steven A.} and Ibers, {James A.}",

year = "1986",

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N2 - 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).

AB - 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).

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Synthesis, Structure, and Transport Properties of Ta₂NiSe₇ and Ta₂PtSe₇

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