Basicity of octa- and dodecamethyl-substituted tetraphenylporphyrins by phase-transfer spectral potentiometric titration

Autor:	A. A. Starikova, A. A. Pendin, A. B. Valiotti
Rok vydání:	2014
Předmět:	chemistry.chemical_compound Chemistry Phase (matter) Potentiometric titration Ph control Inorganic chemistry Ph range chemistry.chemical_element General Chemistry Electrolyte Porphyrin Nitrogen Dication
Zdroj:	Russian Journal of General Chemistry. 84:545-549
ISSN:	1608-3350 1070-3632
DOI:	10.1134/s1070363214030220
Popis:	Phase-transfer potentiometric titration with potentiometric pH control in the system chloroform-aqueous electrolyte solution was used to determine basicity constants for octamethyl-substituted tetraphenylporphyrins. The pH ranges were determined, where the dicationic form of octa- and dodecamethylsubstituted tetraphenylporphyrins is prevailing. It was shown that the basicity of tetraphenylporphyrins is increased by methyl substitution of β-hydrogens (formation of octamethyl-substituted tetraphenylporphyrins). Further methylation of the four central nitrogen atoms of the porphyrin (formation of dodecamethyl-substituted tetraphenylporphyrins) extends the dication stability pH range to 12.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b232f52c220b624be75c857ac7a6a319 https://doi.org/10.1134/s1070363214030220 Zobrazit plný text záznamu Plný text ve formátu PDF