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Citation: Ren Jimin, Pei Fengkui, Wang Wenyun. ¹³C-NMR STUDY ON CONFORMATION OF LANTHANIDE COMPLEXES WITH METHIONINE[J]. Chinese Journal of Applied Chemistry, ;1989, 6(3): 21-25. shu

¹³C-NMR STUDY ON CONFORMATION OF LANTHANIDE COMPLEXES WITH METHIONINE

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 1 July 1988
Available Online: 4 October 1988

Lanthanide-induced shifts have been measured for ¹³C nuclei of methionine in the presence of seven lanthanide cations (La, P_1, Nd, Dy, Ho,Er, Tm) in aqueous solution.The simulation for conformation of lanthanide complexes with methionine shows that the ligand is coordinated to lanthanide ion through oxygen atoms of carboxyl group and the bend length of Ln-O is 2.7Å. In the complexes,methionine is in extended state,the favorable conformation of C_ο-C_α-C_β-C_γ-S and C_α-C_β-C_γ-S is in trans, while that of C_β-C_γ-S-C_δ in gauche. The conformation established for methionine complex by lanthanide-induced shift method is in agreement with the results of vicinyl proton coupling constants and ¹³C paramagnetic relaxation rate determinations.
- ¹³C NMR,
- Methionine,
- Lanthanide-induced shift,
- Conformation
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¹³C-NMR STUDY ON CONFORMATION OF LANTHANIDE COMPLEXES WITH METHIONINE