CRCU

Chemical Research in Chinese Universities ›› 1991, Vol. 7 ›› Issue (3): 148-155.

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A Further Investigation into Intramolecular Process of Mg(Ⅱ)-, Sc(Ⅲ)-, Y(Ⅲ)-, In (Ⅲ)-and Pb(Ⅲ)-CyDTA Complexes by the Method of Dynamic NMR

Song Ruifang, Ba Yong, Qiu Zuwen   

  1. Institute of Theoretical Chemistry, Jilin .University, Changchun
  • Received:1990-01-08 Online:1991-08-24 Published:2011-09-09
  • Supported by:

    Supported by the National Natural Science Foundation of China

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Abstract: The intramolecular process of Mg (Ⅱ) -, Sc (Ⅲ) -, Y (Ⅲ) -, In(Ⅲ)-and Pb (Ⅱ)-trans-1,2-cyclohexanediaminetetraacetic acid (CyDTA) complexes was studied by the method of proton dynamic NMR(DNMR). The top limit of. the experimental temperature range of deuterium oxide solutions was extended from 100℃ to 167 ℃ instead of the previous 100 ℃ by using sealed, thick-walled tubes to observe experimental phenomena further. It was found that another intramolecular process, i. e. B, R (Bonded State, Rotational State) conversion, exists in these complexes formed by polyaminepolycarboxylic ligands in addition to △,A conversion and nitrogen inversion. A quantitative treatment was proposed to estimate the relative populations of acetate groups in B and Rstates.

Key words: Dynamic NMR, Mg-、 Sc-、 Y-、 In-and Pb-CyDTA complexes, Intramolecular process of B,R conversion