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Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (10): 1510.

• Articles • Previous Articles     Next Articles

Dynamic Nuclear Magnetic Resonance of In(Ⅲ)and Y(Ⅲ)-1,2-Propanediaminetetraacetic Acid

SONG Rui-Fang, QIN Song-Yan, LIU Qun, LIU Guang-Min   

  1. Institute of Theoretical Chemistry, Key Laboratory of Molecular Spectra and Structrue, Jilin University, Changchun, 130023
  • Received:1993-10-15 Revised:1994-03-09 Online:1994-10-24 Published:1994-10-24

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Abstract: The temperature dependence of 1H NMRspectra of the In(Ⅲ)and Y(Ⅲ)complexes of 1, 2-propanediaminetetraacetic acid(1 , 2-PDTA)was observed and investigated.The four different ABquartets reveal that the eight acetate methylenic protons of In(Ⅲ)and Y(Ⅲ)-1, 2-PDTAare in different magnetic environment.The ABinterchange phenomena due to nitrogen inversion were observed in the temperature range of 90-140℃.The rate constants and the activation parameters were derived. The Natom near the methyl group has smaller inversion rate than that a little far away the methyl group.In addition, the linear relation between activation energy(Ea)and metal ion potential(z/r)is established for In(Ⅲ), Y(Ⅲ), Zn(Ⅱ), Mg(Ⅱ)and Cd(Ⅱ)-1, 2-PDTA.

Key words: Intramolecular interchange process, 1,2-PDTA, DNMR

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