12166-44-8Relevant articles and documents
R6TT′2, New Variants of the Fe2P Structure Type. Sc6TTe2 (T = Ru, Os, Rh, Ir), Lu 6MoSb2, and the Anti-typic Sc6Te 0.80Bi1.68
Chen, Ling,Corbett, John D.
, p. 436 - 442 (2004)
The Fe2P structure (P62m) features two 3-fold Fe positions and both 2-fold and 1-fold P sites, and variations in occupancies of the latter pair yield the reported diversity of results. The known Sc6TTe 2 examples for T = Fe-Ni are herein extended to four heavier transition metal T derivatives. An attempt to synthesize bismuth analogues led to the novel inverse derivative in which fractional Te (vice T) occupies the smaller tricapped trigonal prismatic (TTP) Sc polyhedron, and Bi rather than Te occurs in the larger TTP of Sc, with parallel reversal of polarity in the bonding. The reported Lu8Te, which is distributed as Lu 6TeLu2, is the only example in which a transition metal occupies the normal 2-fold P or Te non-metal position, with corresponding large effects on the bonding. Lutetium otherwise does not form R6TTe 2 analogues, but the novel Lu6MoSb2 isotype occurs instead. Extended Hueckel calculations are presented for five examples, and the structural and bonding regularities and varieties are discussed further.
Gold derivatives of eight rare-earth-metal-rich tellurides: Monoclinic R7Au2Te2 and orthorhombic R 6AuTe2 types
Chai, Ping,Corbett, John D.
, p. 3548 - 3556 (2012)
Two series of rare-earth-metal (R) compounds, R7Au 2Te2 (R = Tb, Dy, Ho) and R6AuTe2 (R = Sc, Y, Dy, Ho, Lu), have been synthesized by high-temperature techniques and characterized by X-ray diffraction analyses as monoclinic Er7Au 2Te2-type and orthorhombic Sc6PdTe 2-type structures, respectively. Single-crystal diffraction results are reported for Ho7Au2Te2, Lu 6AuTe2, Sc6Au0.856(2)Te2, and Sc6Au0.892(3)Te2. The structure of Ho 7Au2Te2 consists of columns of Au-centered tricapped trigonal prisms (TCTPs) of Ho condensed into 2D zigzag sheets that are interbridged by Te and additional Ho to form the 3D network. The structure of Lu6AuTe2 is built of pairs of Au-centered Lu TCTP chains condensed with double Lu octahedra in chains into 2D zigzag sheets that are separated by Te atoms. Tight binding-linear muffin-tin orbital-atomic sphere approximation electronic structure calculations on Lu6AuTe 2 indicate a metallic property. The principal polar Lu-Au and Lu-Te interactions constitute 75% of the total Hamilton populations, in contrast to the small values for Lu-Lu bonding even though these comprise the majority of the atoms. A comparison of the theoretical results for Lu6AuTe 2 with those for isotypic Lu6AgTe2 and Lu 6CuTe2 provides clear evidence of the greater relativistic effects in the bonding of Au. The parallels and noteworthy contrasts between Ho7Au2Te2 (35 valence electrons) and the isotypic but much electron-richer Nb7P4 (55 valence electrons) are analyzed and discussed.
Two new compounds, Β-ScTe and Y3Au2, and a reassessment of Y2Au
Chai, Ping,Corbett, John D.
, p. i53-i55 (2011)
Two new compounds, Β-ScTe (scandium telluride) and Y 3Au2 (triyttrium digold), have been synthesized by high-temperature solid-state techniques and their crystal structures, along with that of Y2Au (diyttrium gold), have been refined by single-crystal X-ray diffraction methods. Β-ScTe is a superstructure of ScTe (NiAs-type), featuring double hexa-gonal close-packed layers of Te atoms with the octa-hedral cavities filled by Sc atoms. Y3Au2 displays a U 3Si2-type structure and is built from Au 2-centered bitrigonal prisms and centered cubes of Y atoms. The structure of Y2Au is better described as an inverse PbCl 2-type structure rather than a Co2Si-type.
Sc5Ni2Te2: Synthesis, structure, and bonding of a metal-metal-bonded chain phase, a relative of Gd3MnI3
Maggard, Paul A.,Corbett, John D.
, p. 1945 - 1950 (1999)
Sc5Ni2Te2 has been prepared by high-temperature solid-state techniques and the structure determined at 23 °C by single crystal and powder X-ray diffraction methods to be orthorhombic, Pnma (No. 62) with Z = 4, a = 17.862-(1) A?, b = 3.9533(3) A?, c = 10.6398(6) A?. The structure contains pairs of eclipsed zigzag chains of nickel atoms that are sheathed by scandium atoms and demarcated from other chains by tellurium atoms. The structure is isotypic with that of Hf5Co1+xP3-x, but shifted atomic positions and a different ordering of the main group and late transition elements give it a clearly ID character. The differences in dimensionality, ordering, and bonding are discussed, and comparisons are made with GdsMnls and rare-earth-metal cluster halides in general.
Reduced ternary rare-earth-transition metal tellurides for the smaller rare-earth elements. An exploration and an explanation of the marked stability differentiation among the rare-earth elements in these phases
Herzmann, Nina,Gupta, Shalabh,Corbett, John D.
, p. 848 - 854 (2009/10/09)
The existence of further metal-rich condensed cluster compounds in R-Z-Te systems has been synthetically explored for R = Sc, Y, Pr, Dy, Er, Tm, Yb, Lu and, mainly, Z = Ru, Rh, Pd, Ag, Ir, Pt, Au. Ten new examples of orthorhombic Er7Ni2/s
