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Dynamic nuclear magnetic resonance study of intramolecular processes in cyclohexanediaminetetraacetate–metal complexes
Author(s) -
Ba Yong,
Song RuiFang,
Qiu ZuWen
Publication year - 1989
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260271003
Subject(s) - chemistry , intramolecular force , enthalpy , proton nmr , entropy of activation , activation energy , metal , capillary action , nitrogen inversion , analytical chemistry (journal) , nuclear magnetic resonance , nitrogen , thermodynamics , stereochemistry , organic chemistry , kinetics , physics , quantum mechanics , reaction rate constant
The dynamic NMR (DNMR) of the intramolecular acetate scramblings that occur in Ca(II)‐, Sr(II)–, Ba(II)– and La(III)–cyclohexanediaminetetraacetate complexes has been studied. The working temperature range was extended to 430 K by using a sealed thick‐walled capillary sample tube and new DNMR phenomena were thus observed. Information on activation energy, enthalpy, entropy and the free energy of nitrogen inversion of the chelates was obtained by computer analysis.