Influence of the Structure of the Organic Moiety of Copper(II) Porphyrins on Their Reactivity toward Acids
作者:O. V. Kosareva、M. E. Klyueva、T. N. Lomova、E. E. Suslova
DOI:10.1007/s11176-005-0250-x
日期:2005.3
acid-induced dissociation of copper(II) porphyrin complexes with a high degree of meso - and β-substitution in the ligand was studied. The copper(II) complexes with octaethylporphyrins containing 0, 1, 2, 3, and 4 meso -phenyl substituents were ranked with respect to the stability. Octaβ-alkyl and unsymmetrical meso -phenyl substitution affects not only the quantitative characteristics of dissociation of the
作者:E. M. Kuvshinova、D. L. Kuz'min、N. S. Dudkina、S. G. Pukhovskaya、A. S. Semeikin、O. A. Golubchikov
DOI:10.1023/a:1015322118490
日期:——
The dissociation kinetics of the cobalt and copper complexes with octaethylporphyrin, its 5-phenyl, 5,15-diphenyl, and 5,10,15,20-tetraphenyl derivatives, and dodecaphenylporphyrin in acetic acid with small additions of trifluoroacetic acid were studied. In this series of complexes, the steric distortion of the tetrapyrrole macrocycle sequentially increases, which results in a regular decrease in the kinetic stability of the metal porphyrins: The dissociation rate increases by three orders of magnitude.
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作者:E. M. Kuvshinova、D. L. Kuz'min、S. G. Pukhovskaya、A. S. Semeikin、O. A. Golubchikov
DOI:10.1023/a:1025673427341
日期:——
Octaethyl-, 5-phenyloctaethyl-, 5,15-diphenyloctaethyl-, 5,10,15,20-tetraphenyloctaethyl, and dodecaphenylporphyrins were prepared, and their geometries were optimized by the method of molecular mechanics. The deformation of the porphyrin macroring grows as the number of phenyl groups is increased. The dissociation kinetics of the manganese, cobalt, and copper complexes of the porphyrins in solutions of sulfuric acid in acetic acid were studied. The kinetic parameters of the dissociation of metal porphyrins were analyzed in relation to the porphyrin structure and nature of the metal.