Synthesis and Crystal Structure of Cs3nb2br9, a Dinuclear Niobium Cluster
نویسنده
چکیده
SYNTHESIS AND CRYSTAL STRUCTURE OF CS3NB2BR9, A DINUCLEAR NIOBIUM CLUSTER. The niobium bromide cluster compound, Cs3Nb2Br9, was obtained by solid-state synthesis techniques in reaction of stoichiometric amounts of CsBr, Nb powder and NbBr5. It crystallizes in the hexagonal system with unit cell parameters a = 7.7183(2) Å, c = 18.3396(7) Å, space group P63/mmc, Z = 2. Its crystal structure was determined by single crystal X-ray diffraction techniques. The full-matrix least squares refinement against F converged to R1 = 0.036 (Fo > 4σ(Fo)), wR2 = 0.088 (all data). The structure is based on a dinuclear cluster unit Nb2(μ2-Br)3Br6, separated by Cs cation. This compound exhibits the electron counts of four in metal-metal bonding state.
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