Neuhausen Jörg, Finckh E. Wolfgang, Tremel Wolfgang
Institut für Anorganische Chemie und Analytische Chemie der Johannes Gutenberg-Universität Mainz, Becherweg 24, D-55128 Mainz, Germany.
Inorg Chem. 1996 Sep 11;35(19):5622-5626. doi: 10.1021/ic9508379.
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 R&thremacr; 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.
通过在抽真空的石英安瓿中于高温下使化学计量的元素混合物反应，制备了Nb(x)()Ru(6)(-)(x)()Te(8)的组成相。使用Rietveld方法从X射线粉末数据中精修了Nb(3.33)Ru(2.67)Te(8)的结构。Nb(3.33)Ru(2.67)Te(8)在菱面体空间群R&thremacr;中与Mo(6)Q(8)（Q = S、Se、Te）同型结晶，六方晶格参数为a = 10.34106(5) Å，c = 11.47953(7) Å，Z = 3。其结构由M(6)Te(8)混合金属簇（M = Nb、Ru）组成，这些簇通过簇间M-Te键相连形成三维网络。根据鲍林键级对这些相中金属-金属键进行了分析，发现与相关簇化合物相比其键较弱。Nb(x)()Ru(6)(-)(x)()Te(8)是Mo被其他金属完全取代的 Chevrel 型簇相的首批代表。讨论了这种取代所带来的化学前景。
