ESR Study of Stereospecific Proton Transfer in Irradiated Crystals of l -Alanine

Crystals of l-alanine irradiated at 80°K were studied with ESR technique. It was found that the proton transfer, which had originally been proposed by Sinclair and Hanna, was stereospecific: The produced species was found to be O(1)−/CH3HCNH3+—Ċ\O(2)–H, and no evidence for its chemically equivalent...

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Bibliographic Details
Published in:The Journal of chemical physics 1969-01, Vol.51 (8), p.3520-3528
Main Authors: Miyagawa, Ichiro, Tamura, Naoyuki, Cook, J. W.
Format: Article
Language:English
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Summary:Crystals of l-alanine irradiated at 80°K were studied with ESR technique. It was found that the proton transfer, which had originally been proposed by Sinclair and Hanna, was stereospecific: The produced species was found to be O(1)−/CH3HCNH3+—Ċ\O(2)–H, and no evidence for its chemically equivalent species O(1)–H/CH3HCNH3+—Ċ\O(2)− was detected. This stereospecific proton transfer was interpreted on the basis of a quantum-tunneling model, which was found to account for the observed result satisfactorily. A new sample cavity was developed. This cavity has a device which enables one to orient an irradiated crystal to any desired direction, even at 80°K.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1672542