Synthesis and characterization of polymer supported vitamin B-12 model compounds

A series of polymer supported cobalt complexes have been synthesized by the reaction of Co(II)-SALEN (salicylaldehyde ethylenediimine) and other varia tions thereof with the chelating resin containing vinyl pyridine. The polym er supported complexes have been characterized by electronic and infrared s pectra. The presence of polymer supports has a marked influence on the UV-v isible bands observed in the electronic spectra of cobalt complexes. These polymer supported complexes are also investigated by cyclic voltammetry. Th e electronic spectral data and cyclic voltammetric data for free complexes and polymer supported complexes are compared. The discernible differences i n the spectral and electrochemical data suggest the presence of pentacoordi nate cobalt in the polymer matrix.(C) 2000 Society of Chemical Industry.