Observation of kinetic tritium isotope effects by dynamic NMR. The tautomerism of porphyrin

Journal Article · Wed Jul 31 00:00:00 EDT 1996 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja954146n· OSTI ID:380915

Braun, J; Limbach, H H ^[1]; Williams, P G; Morimoto, Hiromi; Wemmer, D E ^[2]

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1. Freie Universitaet Berlin (Germany)
2. Lawrence Berkeley National Lab., CA (United States)

As the knowledge of tritium isotope effects is desirable from a theoretical standpoint, we have applied {sup 3}H NMR in order to study these effects in the case of the double-hydron tautomerism of {sup 15} N-labeled porphyrin. In conclusion, the determination of kinetic tritium isotope effects is a powerful application of dynamic {sup 3}H NMR. In the case of the tautomerism of porphyrin, these effects support the stepwise hydron-tunneling mechanism and can serve to test multidimensional tunneling models in the future. 10 refs., 2 figs.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 380915
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 30 Vol. 118; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
ISOMERS
ISOTOPE EFFECTS
KINETICS
NMR SPECTRA
PORPHYRINS
TRITIUM