Coordinating Properties of Co(II) and Zn(II) Complexes with Sterically Hindered Porphyrins

Author： Pukhovskaya S. G.   Guseva L. Zh.   Semeikin A. S.   Kumeev R. S.   Golubchikov O. A.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1070-3284

Source： Russian Journal of Coordination Chemistry, Vol.29, Iss.11, 2003-11, pp. : 805-809

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Abstract

Cobalt(II) and zinc(II) complexes with 5,15-di(o-methoxyphenyl)-3,7,13,17-tetramethyl-2,8,12,18-tetra-n-buthylporphyrin and its capped analogues, where the MN4 reaction site is shielded by bridging 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.

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