Raman spectroscopic characteristics of octa-substituted bis(phthalocyaninato) rare earth complexes peripherally substituted with (4-methoxy)phenoxy derivatives

Abstract The Raman spectroscopic data in the range 500–1800 cm −1 for a series of 15 rare earth double-deckers with tervalent rare earths M III [Pc(MeOPhO) 8 ] 2 (M = Y, La, …, Lu, except Ce, Pr and Pm), reduced state HPr[Pc(MeOPhO) 8 ] 2 and intermediate-valent cerium Ce[Pc(MeOPhO) 8 ] 2 have been collected using laser excitation source emitting at 632.8 nm. With excitation at 632.8 nm, which is in close resonance with the main Q absorption band of the phthalocyanine ligand, typical Raman marker bands of the monoanion radical [Pc(MeOPhO) 8 ] − were observed at 1500–1528 cm −1 as very strong bands resulting from the coupling of pyrrole C C and aza C N stretchings. For Ce[Pc(MeOPhO) 8 ] 2 and HPr[Pc(MeOPhO) 8 ] 2 , a very strong band at 1499 cm −1 with contributions from both pyrrole C C and aza C N stretchings and also isoindole stretching was the marker Raman band of [Pc(MeOPhO) 8 ] 2− . In addition, the influence of ionic radius of the rare earth metal and substituent species on the Raman scatting characteristics of sandwich-type compounds has also been tentatively studied.