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