Thermodynamic characteristics, mechanism, and spectral manifestations of consecutive reactions between (5,10,15,20-tetraphenylporphyrinato)(chloro)indium(III) ((Cl)InTPP) and organic base 2'-(4-pyridyl)-1'-methylpyrrolidinyl-[60]fullerene (PyF) in chloroform were studied using spectrophotometric titration and physicochemical analysis of intermediate forms. The consecutive coordination of two PyF molecules (K 1 = 6.9. 10 4 , K 2 = 9.3. 10 3 l/mol at 298 K) with the formation of (Cl)(PyF)InTPP and (Cl)(PyF) 2 InTPP, and addition of three other PyF molecules on complex periphery producing (Cl)(PyF) 2 InTPP. 3(PyF) (K 3 = 2.3 l 3 /mol 3) were observed at the first, second, and third steps. The third reaction stage most likely corresponds to π-π complex formation equilibrium between the aromatic complex and PyF with a 1:3 stoichiometry. Perspectives for use of PyF-metalloporphyrin complex as a photovoltaic material are considered.
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