Abstract
Abstract The crystals of R-α-cyanoethyl(S-α-methylbenzylamine)cobaloxime exhibit abnormally anisotropic thermal expansion coefficients. The racemization of the cyanoethyl group in the crystalline state by X-ray exposure [Ohashi and Sasada, Nature, 267, 142 (1977)], is no longer observed below 173K. From structure analyses at 173K and room temperature, the mechanism of the racemization has been made clear.
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