Influence of the Ligand’s Basicity on the Kinetics of Complexation of 5,10,15,20-Tetra(trifluoromethyl) and 5,10,15,20-Tetra(iso-butyl)porphine with Copper Acetate

Svetlana G. Pukhovskaya,^a@ Yulia B. Ivanova,^b Aleksander S. Semeikin,^a and Oleg A. Golubchikov^a

^aIvanovo State University of Chemistry and Technology, 153000 Ivanovo, Russia

^bG.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 153045 Ivanovo, Russia

^@Corresponding author E-mail: svetlana.puhovskaya@mail.ru

DOI: 10.6060/mhc180167p

Macroheterocycles 2018 11(1) 73-78

Spectrophotometric researches of base and complexation properties of 5,10,15,20-tetra(trifluoromethyl)porphine and 5,10,15,20-tetra(iso-butyl)porphine in systems acetonitrile–HClO₄and CH₃COOH–Cu(ОАc)₂ were carried out. It was found that consistent protonating of nitrogen atoms of pyrrolic rings with formation of mono- and dicationic forms is occurred during titration of ligands by perchloric acid. Electron absorption spectra may be obtained for these cationic forms. Total basicity constants and concentration intervals of existing of ligands ionized forms in acetonitrile are found out. Kinetic parameters of copper(II) complex formation are determined. The influence of nature of meso-position substituents of porphyrin macrocycle on reactivity of tetrapyrrolic macrocycle is discussed.

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Influence of the Ligand’s Basicity on the Kinetics of Complexation of 5,10,15,20-Tetra(trifluoromethyl) and 5,10,15,20-Tetra(iso-butyl)porphine with Copper Acetate

References: