BIS(PHTHALOCYANINATO)NIOBIUM(IV) - A NEW SANDWICH-TYPE MOLECULE STAPLED BY TWO INTER-LIGAND C-C SIGMA BONDS

摘要

Bis(phthalocyaninato)niobium(IV), [Pc2Nb], a new sandwich-type molecule of unusual light-brown colour, has been obtained from the reaction of PcNbCl2 with PcNa2 in alpha-chloronaphthalene. Information at hand, including IR and UV-Vis spectral data, strongly suggests the presence in the complex of highly distorted Pc fragments 'stapled' by interligand C-C sigma bonds, a peculiar feature so far observed only in its Ti(IV) analogue, [Pc2Ti]. [References: 10]