The preparation and infra-red spectra of phthalocyanine derivatives of the platinum-group metals

Abstract

The i.r. spectra of phthalocyanine derivatives of Pd, Pt, Rh, Ir, Ru, Os in the region 220–5000 cm −1 are reported. The mono (1,2-dicyanobenzene) adducts, PcCl. Ir(III) Cl·C 6H 4 (CN) 2, Pc ∗ ∗ Pc, the phthalocyanino residue, C 32H 16N 8 PcCl, the monochlorophthalocyanino group, C 32H 15ClN 8 MCl·C 6H 4 (CN) 2 (MRu(III), Os(III), are found to be the main reaction products of Ir, Ru, Os chlorides and 1,2-dicyanobenzene at ca. 280°C. Osmium tetroxide, OsO 4, and 1,2-dicyanobenzene give, at the same reaction temperature, the (phthalocyanino) dioxo-osmium(VI)-1,2-dicyanobenzene adduct, PcOsO 2·C 6H 4(CN) 2. Bands relatively sensitive to and characteristic of the platinum-group metals in their phthalocyanines are observed. One possible tentative assignment of the weak band varying between 910–918 cm −1 is as a rocking vibration of the metal-phthalocyanine nucleus.