Abstract
A bisporphyrinocalix[4]arene was prepared, and its basicity was examined spectrophotometrically. The protonation of tetrapyrrole fragments of the porphyrinocalixarene conjugate in the ethanol-sulfuric acid system occurs in two steps and is described by the Hammett equation. The ionization constants and the concentration intervals of the formation of the mono-and dicationic forms of the bisporphyrinocalixarene were determined.
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Original Russian Text © Yu.B. Ivanova, Yu.I. Churakhina, N.Zh. Mamardashvili, 2008, published in Zhurnal Obshchei Khimii, 2008, Vol. 78, No. 4, pp. 691–695.
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Ivanova, Y.B., Churakhina, Y.I. & Mamardashvili, N.Z. Synthesis and basic properties of bisporphyrinocalix[4]arene. Russ J Gen Chem 78, 673–677 (2008). https://doi.org/10.1134/S1070363208040269
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DOI: https://doi.org/10.1134/S1070363208040269