Coordinating Properties of Co(II) and Zn(II) Complexes with Sterically Hindered Porphyrins
摘要:
Cobalt(II) and zinc(II) complexes with 5,15-di(o-methoxyphenyl)-3,7,13,17-tetramethyl-2,8,12,18-tetra-n-buthylpotphyrin and its capped analogues, where the MN4 reaction site is shielded by bridging a groups containing m-phenylene and dimethoxy-substituted p-phenylene fragments, were synthesized. Equilibrium constants of additional coordination of pyridine and N-methylimidazole by these metalloporphyrins were determined at 298 K. It was found that steric distortion of the porphyrin core destabilizes extra complexes.