31P and 1H NMR study of the preotonation of trimethyl and tributyl phosphates

Abstract

A 31P and 1H NMR study was made of the protonation of Me3PO4 (TMP), infinitely miscible with water. The chem. shifts (2.95 and 2.65 ppm) and equilibrium constants [0.90/mol.dm-3 and 0.12/(mol.dm-3)2] of the 2 complexes (H2O.TMP and H2O.2TMP) were obtained from the 31P chem. shift variation with concentration The variation of the 1H chem. shift of water in the system was analyzed. When the 1H chem. shifts of the 2 complexes are 4.58 and 2.20 ppm, resp., the chem. shift of the free water in the system is related linearly to its concentration: dH2O = 2.71 + 0.54 ln [H2O]eq. This formula also fits well in the case of the protonation of TBP when the chem. shifts and equilibrium constants of H2O.TBP and H2O.2TBP are 4.41 and 2.52 ppm, 3.0/mol.dm-3 and 2.25/(mol.dm-3)2, resp.

Key words: CONCENTRATION, PHOSPHORIC ACID TRIBUTYL ESTER, PROTON MAGNETIC RESONANCE SPECTROMETRY, METHYL ESTER, CHEMICAL SHIFT, PHOSPHORIC ACID ESTER

CLC Number:

O627
O657

Cite this article

DU YOURU;PENG HAOBO;YUAN HANZHEN;CHEN LIMIN. 31P and 1H NMR study of the preotonation of trimethyl and tributyl phosphates[J]. Acta Chimica Sinica, 1987, 45(3): 279-282.

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磷酸三甲(丁)酯质子化的^3^1P和1HNMR研究