scholarly journals Site lifetime temperature variations in intermolecular exchange processes characterized by a two-term rate law

1982 ◽  
Vol 35 (4) ◽  
pp. 839
Author(s):  
DL Pisaniello ◽  
SF Lincoln ◽  
T Kurucsev
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Temperature Dependence ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Temperature Variations ◽  
Rate Law ◽  
First Order ◽  
Exchange Processes

The temperature dependence of the site lifetimes, tA and tB, characterizing the intermolecular exchange of X between sites A and B through simultaneous first-order and second-order processes as expressed in the rate law 1/tA = XB/XAtB = k1 + k2[B] and the treatment of such data determined by nuclear magnetic resonance spectroscopy are discussed.

The structures of some cobalamins in solution

1976 ◽  
Vol 273 (924) ◽  
pp. 353-357 ◽  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Temperature Dependence ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Crystalline State ◽  
Resonance Spectroscopy ◽  
Nuclear Magnetic

Nuclear magnetic resonance spectroscopy has been used to examine the conformations of cobalamins in solution. The perturbation of the resonances in the n.m.r. spectra by lanthanide probes provided particularly valuable information. Except for minor details the conformations are the same as those in the crystalline state. The temperature dependence of the conformation has been reassessed.

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