Grafting {Cp*Rh}(2+) on the surface of Nb and Ta Lindqvist-type POM

摘要

New hybrid POM based on Lindqvist-type polyoxometalates [M6O19](8-) (M = Nb, Ta) and organometallic fragment {Cp*Rh}(2+) have been isolated and characterized. X-ray quality crystals of K-4[(Cp* Rh)(2)Nb6O19]center dot 20H(2)O (1) and Cs-4[(Cp*Rh)(2)Ta6O19]center dot 18H(2)O (2) were obtained from solutions with {Cp*Rh} : [M6O19](8-) stoichiometry 2 : 1. The solution behavior of the hybrid polyoxoanions was studied with ESI-MS and H-1 DOSY NMR. Amongst the poorly investigated chemistry of polyoxotantalates, complex 2 is the first complex bearing a grafted organometallic fragment. The formation of 1 : 1 complexes was detected by ESI-MS techniques.