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

Acta Cryst. (2008). C64, m321-m323 (doi.org/10.1107/S0108270108025055)

Two dinuclear, oxide- or selenide-bridged, niobium(IV) bis(cyclopentadienyl) tert-butylselenolates have been obtained. These are the first organometallic niobium selenolates to be structurally characterised. In the oxide, the O atom lies on an inversion centre and the Nb-O-Nb linkage is linear, whereas in the selenide (see figure) the Nb-Se-Nb angle is 139.76 Å. This difference can be attributed to π bonding in the oxide.

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