Basicity of para-substituted tetraphenylporphyrins studied by two-phase spectropotentiometric titration

Autor:	A. A. Starikova, A. B. Valiotti, A. A. Pendin
Rok vydání:	2014
Předmět:	chemistry.chemical_compound chemistry Hammett equation Phase (matter) Inorganic chemistry chemistry.chemical_element Titration General Chemistry Electrolyte Nitrogen Acid dissociation constant Pyrrole Dication
Zdroj:	Russian Journal of General Chemistry. 84:98-102
ISSN:	1608-3350 1070-3632
DOI:	10.1134/s1070363214010150
Popis:	The basicity constants of a series of para-substituted tetraphenylporphyrins have been determined by two-phase spectrophotometric titration with pH monitoring in the chloroform-aqueous electrolyte solution system; the pH ranges of prevailing of the dication and the neutral forms of the porphyrins have been estimated. With introducing the donor substituents at the para-position of phenyl fragments of porphyrins, the compound basicity increases. Ionization constant of the pyrrole nitrogen atoms depends on the donor-acceptor properties of the substituents according to the Hammett equation. Basing on the derived dependence, theoretical basicity constants of the para-substituted porphyrins bearing strongly donor groups have been predicted.
Databáze:	OpenAIRE
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