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Author: search.filters.author.Lin, CCSubject: search.filters.subject.hetero-association

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    Graphical method for the determination of the complex NMR shift and equilibrium constant for a hetero-association accompanying self-associations
    (1997-08-01)
    Lin, CC
    ;
    Fang, CY
    ;
    Kao, DY
    ;
    Chen, JS
    ;
    應用化學系
    We describe a novel graphical method which, in conjunction with the previously proposed graphical determination of mono;ner shift, dimer shift, and dimerization constant for self-association, allows us to determine the complex shift and equilibrium constant for a hetero-association, A + B reversible arrow AB, accompanying self-associations, A + A reversible arrow A(2), and B + B reversible arrow B-2. The merit of the new method includes the removal of the restrictions imposed on the conventional Benesi-Hildebrand (B-H) plot: (1) that the concentration of one component must be much less than that of the other; (2) that there be no accompanying self-association, The simultaneous equilibrium of the self-association of 2-pyrrolidone (A) and that of 4-methyl-alpha-pyrrolidone (B) and the hetero-association between A and B in acetonitrile-d(3) at 25 degrees C is studied. The inappropriateness of the B-H plot in dealing with this case is also pointed out.
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    NMR study of hetero-association accompanying self-association of 2-hydroxyl-4-methyl-pyridine and 2-pyrrolidone in acetonitrile
    (2000-12-01)
    Luo, WC
    ;
    Lin, CC
    ;
    Lin, JA
    ;
    Kao, DY
    ;
    Chen, JS
    This work investigated not only the equilibrium of self-association of 2-pyrrolidone (A) and that of 2-hydroxyl-4-methyl-pyridine (B), but also the hetero-association between A and B in [H-2(3)]acetonitrile through hydrogen bonding using high-resolution nuclear magnetic resonance spectroscopy. Dilution shift data for the protons of the NW group of A and OH group of B were measured over a wide range of temperatures and concentrations. In addition, the monomer shifts, dimer shifts and dimerization constants of self-association and hetero-association were evaluated using a graphic method operating on the dilution chemical shift data. The enthalpy and entropy of dimerization of self-association and hetero-association were also obtained from the van't Hoff plot.
  • Thumbnail Image
    Item type:Item,
    Graphical method for the determination of the complex NMR shift and equilibrium constant for a hetero-association accompanying self-associations
    (1997-08-01)
    Lin, CC
    ;
    Fang, CY
    ;
    Kao, DY
    ;
    Chen, JS
    ;
    交大名義發表
    We describe a novel graphical method which, in conjunction with the previously proposed graphical determination of mono;ner shift, dimer shift, and dimerization constant for self-association, allows us to determine the complex shift and equilibrium constant for a hetero-association, A + B reversible arrow AB, accompanying self-associations, A + A reversible arrow A(2), and B + B reversible arrow B-2. The merit of the new method includes the removal of the restrictions imposed on the conventional Benesi-Hildebrand (B-H) plot: (1) that the concentration of one component must be much less than that of the other; (2) that there be no accompanying self-association, The simultaneous equilibrium of the self-association of 2-pyrrolidone (A) and that of 4-methyl-alpha-pyrrolidone (B) and the hetero-association between A and B in acetonitrile-d(3) at 25 degrees C is studied. The inappropriateness of the B-H plot in dealing with this case is also pointed out.