6533b836fe1ef96bd12a0922

RESEARCH PRODUCT

NbxRu6-xTe8, New Chevrel-Type Clusters Containing Niobium and Ruthenium,

E. W. FinckhWolfgang TremelJörg Neuhausen

subject

Inorganic ChemistryCrystallographychemistryGroup (periodic table)NiobiumCluster (physics)chemistry.chemical_elementHexagonal latticePhysical and Theoretical ChemistryType (model theory)Bond orderStoichiometryRuthenium

description

Phases of composition Nb(x)()Ru(6)(-)(x)()Te(8) were prepared by reacting stoichiometric mixtures of the elements at high temperature in evacuated silica ampules. The structure of Nb(3.33)Ru(2.67)Te(8) was refined from X-ray powder data using the Rietveld method. Nb(3.33)Ru(2.67)Te(8) crystallizes isotypic with Mo(6)Q(8) (Q = S, Se, Te) in the rhombohedral space group Rthremacr; with the hexagonal lattice parameters a = 10.34106(5) Å, c = 11.47953(7) Å, and Z = 3. Its structure consists of M(6)Te(8) mixed-metal clusters (M = Nb, Ru) which are connected by intercluster M-Te bonds to form a three-dimensional network. Metal-metal bonding in these phases is analyzed in terms of Pauling bond orders and found to be weaker compared to that in related cluster compounds. Nb(x)()Ru(6)(-)(x)()Te(8) are the first representatives of Chevrel-type cluster phases with complete substitution of Mo by other metals. The chemical perspectives arising from this substitution are discussed.

yearjournalcountryeditionlanguage
1996-09-11Inorganic Chemistry
https://doi.org/10.1021/ic9508379