D. B. Berezina and M. B. Berezinb
a Ivanovo State University of Chemical Technology, Ivanovo, Russia
b Institute of the Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia
e-mail: berezin@isuct.ru
Received March 25, 2008
Abstract—The energy characteristics of complex formation between porphyrins in saddlelike nonplanar con-
formations and copper(II) and cadmium(II) acetates and acetylacetonates in N,N-dimethylformamide were
determined calorimetrically. The enthalpies of the reactions linearly correlated with the parameters character-
izing the nonplanar structure of aromatic macrorings in the solid state and solution. The propensity of porphy-
rins in nonplanar saddle conformations for forming complexes with cadmium(II) decreased as their nonplanar-
ity increased. Complex formation between porphyrins and [Zn(II), Cu(II)] d metal salts was shown to be highly
probable in nonpolar benzene according to the mechanism of salt coordination sphere contraction.
DOI: 10.1134/S0036024409050057
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