Mixed ligand five coordinate cobalt(II) complexes of a polymer-bound schiff base derived from 2-aminobenzimidazole

The complexes resulting from the interaction of a new Schiff base ligand derived from crosslinked polystyrene bound benzaldehyde and 2-aminobenzimidazole with a square planar complex Co(TPP)] (where TPP = meso-tetraphenylporphyrin), and also with tetrahedral complexes Co(BPBI)₂X₂] (where BPBI = 1-benzyl-2-phenylbenzimidazole, X = Cl, Br, or NCS) have been isolated and characterized. The percentages of cobalt and nitrogen in the complexes show that only one Schiff base unit is coordinated to cobalt. Infrared spectra suggest that the bonding of the polymer ligand to cobalt is through the N-3 atom of the benzimidazole moiety. The EPR spectra indicate that all the complexes are in the low-spin state and have a square pyramidal environment around cobalt(II). © 1992 John Wiley & Sons, Inc.