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

Chinese Journal of Applied Chemistry ›› 1989, Vol. 0 ›› Issue (3): 21-25.

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

Ren Jimin, Pei Fengkui, Wang Wenyun

Changchun Institute of Applied Chemistry, Academia Sinica

Received:1988-07-01 Revised:1988-10-04 Published:1989-06-10 Online:1989-06-10

Abstract

Abstract: Lanthanide-induced shifts have been measured for ¹³C nuclei of methionine in thepresence of seven lanthanide cations (La, P₁, Nd, Dy, Ho,Er, Tm) in aqueous solution.The simulation for conformation of lanthanide complexes with methionine shows that theligand is coordinated to lanthanide ion through oxygen atoms of carboxyl group and thebend length of Ln-O is 2.7Å. In the complexes,methionine is in extended state,the favor- able 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_δin gauche. The conformation established for methionine complex by lanthanide-inducedshift method is in agreement with the results of vicinyl proton coupling constants and ¹³Cparamagnetic relaxation rate determinations.

Key words: ¹³C NMR, Methionine, Lanthanide-induced shift, Conformation

Ren Jimin, Pei Fengkui, Wang Wenyun. ¹³C-NMR STUDY ON CONFORMATION OF LANTHANIDE COMPLEXES WITH METHIONINE[J]. Chinese Journal of Applied Chemistry, 1989, 0(3): 21-25.

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

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