An unprecedented tetranuclear niobium aqua ion with a capping mu4-sulfido ligand |
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| Authors: | Ooi Bee-Lean Søtofte Inger Bendtsen Maja F Munch Astrid Nielsen Loa C Henriksen Jonas |
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| Institution: | Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800 Kgs. Lyngby, Denmark. obl@kemi.dtu.dk |
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| Abstract: | The aqueous solution chemistry of niobium is rather unexplored, and well characterized aqua complexes are scarce. In this work, a new niobium aqua ion is obtained upon treatment of Zn-reduced ethanolic solutions of NbCl5 with HCl in the presence of a sulfide source. The red aqua ion, obtained upon cation-exchange chromatography, forms readily the thiocyanate complex which has been crystallized as Cs(4.26)Na(1.74)Nb4SO5(NCS)10] . 0.33H2O. X-ray crystallography revealed an unprecedented metal-metal bonded tetranuclear Nb4(mu4-S)(mu2-O)5(4+) core with a capping mu4-S ligand. |
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