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KMID : 1059519920360030345
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Journal of the Korean Chemical Society
1992 Volume.36 No. 3 p.345 ~ p.350
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1H-NMR Studies on Ln3+-DMF Systems (Ⅰ). Exchange Rates and Proton Chemical Shifts of CHO Group
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Lee Mi-Kyung
Yoon Chang-Ju
Choi Young-Sang
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Abstract
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Proton lineshapes and chemical shifts of paramagnetic solutions of Ln(NO3)3 in DMF have been measured over the temperature range 240K to 3807K. Solvation sphere exchange rates and the thermodynamic exchange parameters for CHO group of the DMF molecules have been extracted from these data. The results were established through a detailed analysis and discussion of the temperature depending data of the 1/T2 and △ω data were analyzed in detail, and it has been found that delocalization of the unpaired electron spin from some Ln3+ ion to DMF molecules beyond the first solvation shell would occur, giving rise to a scalar relaxation contribution in the bulk solvent.
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KEYWORD
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