Protolytic properties of aminomethylated calix[4]resorcinol, hydroxyethylidene diphosphonic acid and their composition in aqueous micellar solutions

The constants of protolytic equilibria for hydroxyethylidene diphosphonic acid (HEDP), aminomethylated calix[4]resorcinol (AMC), and the composition based on them (AMC-HEDP) in a solution of nonionic surfactant-polyoxyethylated dodecanol Brij-35 have been determined by pH-metric titration with subse...

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Published inUchenye zapiski Kazanskogo universiteta. Serii͡a︡ Estestvennye nauki Vol. 160; no. 2; pp. 185 - 199
Main Authors E.A. Burilova, T.V. Nikitina, L.I. Vagapova, Z.A. Nasirova, A.N. Solodov, J.R. Shaiymova, R.R. Amirov
Format Journal Article
LanguageEnglish
Russian
Published Kazan Federal University 01.01.2018
Subjects
amc-hedp composition
aminomethylated calixresorcinol
hydroxyethylidene diphosphonic acid
ph-metric titration
protolytic properties
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Summary:The constants of protolytic equilibria for hydroxyethylidene diphosphonic acid (HEDP), aminomethylated calix[4]resorcinol (AMC), and the composition based on them (AMC-HEDP) in a solution of nonionic surfactant-polyoxyethylated dodecanol Brij-35 have been determined by pH-metric titration with subsequent mathematical processing of the data. In addition to monomeric forms, the existence of several dimeric forms of different extent of protonation has been also found in the solutions of AMC and HEDP. For the composition based on AMC-HEDP in the pH range from acid to neutral, the formation of mixed forms of the following composition has been established: H16YL40, H15YL41–, H14YL42–, H13YL43–, H12YL44–, H7YL2–, H6YL22–.
ISSN:2542-064X
2500-218X