Deuterium Discrimination in P--H/P--D Exchange of Phosphorous Acid

Deuterium discrimination in P--H/P--D exchange is first reported. Quantitative 1 H and 31 P NMR analyses of the phosphorous acid in H 2 O/D 2 O solutions indicate that there is a strong discrimination against deuterium bonding with phosphorus. The ([PD]/[PH]) nmr ratio, where [PD] nmr and [PH] nmr a...

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Bibliographic Details
Published in:Phosphorus, sulfur, and silicon and the related elements sulfur, and silicon and the related elements, 2002-10, Vol.177 (10), p.2409-2414
Main Authors: Zhang, Yong-Hong, Mao, Xi-An
Format: Article
Language:English
Subjects:
Deuterium Discrimination
Isotope Exchange
Phosphorous Acids
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Summary:Deuterium discrimination in P--H/P--D exchange is first reported. Quantitative 1 H and 31 P NMR analyses of the phosphorous acid in H 2 O/D 2 O solutions indicate that there is a strong discrimination against deuterium bonding with phosphorus. The ([PD]/[PH]) nmr ratio, where [PD] nmr and [PH] nmr are the NMR determined concentration of phosphorus attached to deuterium and proton, respectively, is only 67% of the stoichiometrical D/H ratio in the studied solutions. The very strong isotope discrimination should originate from the isotope effect in tautomerization involving an intermediate having the structure of P(OH) 3 where the three OH's are equivalent.
ISSN:1042-6507
1563-5325
DOI:10.1080/10426500214304