Chemical state detection of dibutyl phosphate using 31P NMR chemical shift change

Autor:	Naohito Uetake
Rok vydání:	1991
Předmět:	Tetramethylammonium Organic Chemistry Inorganic chemistry General Chemistry Ion-association Catalysis Acid dissociation constant Ion chemistry.chemical_compound Chemical state chemistry Moiety Polar Tributyl phosphate
Zdroj:	Canadian Journal of Chemistry. 69:322-326
ISSN:	1480-3291 0008-4042
Popis:	Chemical shift changes of 31P NMR were investigated for dibutyl phosphate (DBP) in several polar solvents and compared with tributyl phosphate (TBP). The chemical shift differences between DBP and TBP in the same solvents were found to reflect only the intermolecular interaction on P—OH in DBP, a moiety that is not present in TBP. Acid dissociation constants, Ka, in several polar solvents were determined using such chemical shift differences of DBP. The Ka determined in pure water is in good agreement with the literature value. The intermolecular interaction between alkaline ions and DBP was also investigated using a similar method. No interactions with Na+ ion and K+ ion were detected from chemical shift change. However, ion association between the tetramethylammonium ion and the DBP− ion was detected and the complex formation constant was determined as Kc = 0.49 ± 0.02 M−1. Key words: Fourier transform nuclear magnetic resonance spectrometry, dibutyl phosphate, chemical shift, acid dissociation, intermolecular interaction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::656431a64f1e4429db4d0bc9987de779 https://doi.org/10.1139/v91-049 Zobrazit plný text záznamu