Abstract
Enthalpy—entropy compensation upon the coordination of zinc ions by porphyrins with various structural organizations of peripheral substitution in solutions at 298 K was studied. The same compensation temperature Tc was found for both free bases and doubly deprotonated porphyrin macrocycles. The data obtained indicate that the coordination of the metal ion in the tetrapyrrole macrocycle core by the free bases and doubly coordinated forms of porphyrins is characterized by the same promoting vibrational modes.
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Dedicated to Academician of the Russian Academy of Sciences I. L. Eremenko on the occasion of his 70th birthday.
This study was carried out using the equipment of the Center for Collective Use “The Upper Volga Regional Center for Physical and Chemical Research” at the G. A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences.
This work was financially supported by the Russian Foundation for Basic Research (Project No. 19-03-00214 A) and the State Program of Scientifi c Research of the Belarus Republic “Photonics” (Grant No. 1.3.01, supervisor M. M. Kruk).
Published in Russian in Izyestiya AkademiiNauk. Seriya Khimicheskaya, No. 6, pp. 1072–1075, June, 2020.
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Kruk, M.M., Pukhovskaya, S.G., Ivanova, Y.B. et al. Enthalpy—entropy compensation upon metal ion coordination with porphyrins: generalization for the free bases and doubly deprotonated macrocycles. Russ Chem Bull 69, 1072–1075 (2020). https://doi.org/10.1007/s11172-020-2868-6
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DOI: https://doi.org/10.1007/s11172-020-2868-6