Grafting {Cp*Rh}2+ on the surface of Nb and Ta Lindqvist-type POM. Issue 5 (18th December 2014) - Abramov, P. A.
Abstract : Structure of a new hybrid organometallic-pom complex [ trans -{Cp*Rh}2 M6 O19 ] 4− (M = Nb, Ta). Abstract : New hybrid POM based on Lindqvist-type polyoxometalates [M6 O19 ] 8− (M = Nb, Ta) and organometallic fragment {Cp*Rh} 2+ have been isolated and characterized. X-ray quality crystals of K4 [(Cp*Rh)2 Nb6 O19 ]·20H2 O (1 ) and Cs4 [(Cp*Rh)2 Ta6 O19 ]·18H2 O (2 ) were obtained from solutions with {Cp*Rh} : [M6 O19 ] 8− stoichiometry 2 : 1. The solution behavior of the hybrid polyoxoanions was studied with ESI-MS and 1 H DOSY NMR. Amongst the poorly investigated chemistry of polyoxotantalates, complex2 is the first complex bearing a grafted organometallic fragment. The formation of 1 : 1 complexes was detected by ESI-MS techniques.