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- Title
Basicity of octa- and dodecamethyl-substituted tetraphenylporphyrins by phase-transfer spectral potentiometric titration.
- Authors
Starikova, A.; Pendin, A.; Valiotti, A.
- Abstract
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.
- Subjects
BASICITY; AROMATIC compounds spectra; PHENYL compounds; POTENTIOMETRY; CHLOROFORM; ELECTROLYTES; PORPHYRINS spectra
- Publication
Russian Journal of General Chemistry, 2014, Vol 84, Issue 3, p545
- ISSN
1070-3632
- Publication type
Article
- DOI
10.1134/S1070363214030220