Transition metal-chelate complexes as relaxation modifiers in nuclear magnetic resonance

1984 ◽  
Vol 11 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Mark A. Brown ◽  
G. Allan Johnson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Chelate ◽  
Chelate Complexes ◽  
Nuclear Magnetic

scholarly journals A13C NMR study of the interactions of Ag13CN and Ag(CN)2–with thiomalic acid, L-methionine and DL-selenomethionine

2005 ◽  
Vol 19 (5,6) ◽  
pp. 275-281 ◽  
Author(s):  
Anvarhusein A. Isab ◽  
Mohamed I. M. Wazeer
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chelate Complexes ◽  
Neutral Ph ◽  
Nmr Study ◽  
Insoluble Polymer ◽  
C Nmr ◽  
Nuclear Magnetic

Complexation of Ag+as AgNO3, solid AgCN and Ag(CN)2–by labeled and unlabeled L-methionine, DL-selenomethionine and d,l-thiomalate were studied by nuclear magnetic resonance methods. The13C NMR indicates that only Ag+react with the both L-methionine, DL-selenomethionine at neutral and higher pH via CO2–and S or Se atom forming a chelate. The Ag(CN)2–and AgCN do not bind to either of these two ligands at any pH. The Ag13CN, which is an insoluble polymer, can react with thiomalate to form chelate complexes at neutral pH. Various structures for the chelate formations are proposed.

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