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International Union of Crystallography, Acta Crystallographica Section C: Crystal Structure Communications, 10(64), p. m321-m323, 2008

DOI: 10.1107/s0108270108025055

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[{Cp2(tBuSe)Nb}2E] (E= O and Se) with bridging oxide or selenide ligands

Journal article published in 2008 by Andrew L. Hector ORCID, Marek Jura, William Levason, Gillian Reid, Stuart D. Reid, Michael Webster
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

The title compounds, -oxido-bis[(tert-butylselenolato)bis(5-cyclopentadienyl)niobium(IV)] toluene solvate, [Nb2(C5H5)4(C4H9Se)2O]·C7H8, and -selenido-bis[(tert-butylselenolato)bis(5-cyclopentadienyl)niobium(IV)], [Nb2(C5H5)4(C4H9Se)2Se], consist of niobium(IV) centres each bonded to two 5-coordinated cyclopentadienyl groups and one tert-butylselenolate ligand and are the first organometallic niobium selenolates to be structurally characterized. A bridging oxide or selenide completes the niobium coordination spheres of the discrete dinuclear molecules. In the oxide, the O atom lies on an inversion centre, resulting in a linear Nb-O-Nb linkage, whereas the selenide has a bent bridging group [Nb-Se-Nb = 139.76 (2)°]. The difference is attributable to strong bonding in the oxide case, although the effects on the Nb-C and Nb-SetBu bond lengths are small.