Add time:07/21/2019         Source:sciencedirect.com

The carbon-13 relaxation times of a number of amino acids and small peptides have been studied in the presence and absence of the paramagnetic, substitutionally inert complex tris(ethylenediamine)chromium(III) chloride. A metal-complex induced dipolar relaxation pathway is observed, uncomplicated by contact effects. The relaxation time (T1e) for this process can be readily measured. In neutral or basic solution the complex interacts preferentially with the carboxylate or carbonyl moiety. Relaxation times of other carbon nuclei reflect a greater average distance from the complex, providing a basis of distinguishing conformations in aqueous solution. Studies of T1e of the d or l isomers of a given amino acid with either the d or the l isomer of the chromium complex were also carried out and identical T1e values were observed in the cases studied. The use of tris(ethylenediamine)chromium(III) chloride as a relaxation reagent for carbon-13 magnetic resonance spectroscopy in aqueous solution is illustrated and discussed.

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