Acta Crystallographica Section C

Crystal Structure Communications

Volume 64, Part 10 (October 2008)

metal-organic compounds

 

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

A. L. Hector, M. Jura, W. Levason, G. Reid, S. D. Reid and M. Webster

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-Se^tBu bond lengths are small.

Formula: [Nb₂(C₅H₅)₄(C₄H₉Se)₂O]·C₇H₈ and [Nb₂(C₅H₅)₄(C₄H₉Se)₂Se]

	Structure factor file (CIF format) (182.8 kbytes) [ doi:10.1107/S0108270108025055/bm3060Isup2.hkl ] Contains datablock I
	Structure factor file (CIF format) (320.1 kbytes) [ doi:10.1107/S0108270108025055/bm3060IIsup3.hkl ] Contains datablock II

To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.

The download button will force most browsers to prompt for a file name to store the data on your hard disk.

Where possible, images are represented by thumbnails.

Copyright © International Union of Crystallography
IUCr Webmaster