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Updated: Jun 29, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
Published on: December 29, 2016
[{Cp2(tBuSe)Nb}2E] (E = O and Se) with bridging oxide or selenide ligands
Andrew L Hector1, Marek Jura, William Levason
1School of Chemistry, University of Southampton, Southampton SO17 1BJ, England. a.l.hector@soton.ac.uk
Abstract:
The title compounds, mu-oxido-bis[(tert-butylselenolato)bis(eta(5)-cyclopentadienyl)niobium(IV)] toluene solvate, [Nb(2)(C(5)H(5))(4)(C(4)H(9)Se)(2)O] x C(7)H(8), and mu-selenido-bis[(tert-butylselenolato)bis(eta(5)-cyclopentadienyl)niobium(IV)], [Nb(2)(C(5)H(5))(4)(C(4)H(9)Se)(2)Se], consist of niobium(IV) centres each bonded to two eta(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) degrees]. The difference is attributable to strong pi bonding in the oxide case, although the effects on the Nb-C and Nb-Se(t)Bu bond lengths are small.
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