Bulletin of the Korean Chemical Society

  • 제15권9호
  • /
  • Pages.782-785
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  • 1994
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  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Dissociation Kinetics of Linear polyaminopolycarboxylate Complexes of Lanthanides(III)

  • Ki-Young Choi (Department of Chemistry, Mokwon University) ;
  • Ki Sung Kim (Department of Chemistry, Mokwon University) ;
  • Choon Pyo Hong (Department of Chemical Education, Kongju National University)
  • 발행 : 1994.09.20
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초록

The dissociation kinetics of linear polyaminopolycarboxylate complexes of lanthanide ions (L$n^{3+}: Ce^{3+},\;Eu^{3+}\;and\;Yb^{3+}$) has been studied in an aqueous solution of 0.10 M (NaCl$O_4$) at 25.0${\pm}0.1^{\circ}C$ using Cu(II) ions as a scavenger. The dissociation rates of acid-catalyzed pathway decrease in the order Ln(EPDTA$)^- > Ln(DPOT)^- > In(TMDTA)^- > Ln(MPDTA)^- > Ln(EDTA)^- > Ln(PDTA)^- > Ln(DCTA)^-$ according to the present and literature data. An increase in the N-Ln-N chelate ring from 5 to 6 and substitution of two methyl groups, one ethyl and hydroxyl group on a chelate ring carbon of these ligands leads to a decrease in kinetic stabilities of the complexes. The substitution of one methyl group and cyclohexyl ring on a ring carbon, however, results in a significant increase in the kinetic stability of the resulting $Ln^{3+}$ complexes. Individual reaction steps taking place for each system, with different copper, acetate buffer concentration and pH dependence, are also discussed.

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참고문헌

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피인용 문헌

  1. Formation and dissociation kinetics of triaza-crown-alkanoic acid complexes of transition metal(II) and lanthanide (III) vol.44, pp.4, 1994, https://doi.org/10.1016/s0039-9140(96)02052-8
  2. Complexation of 1,3-Diamino-2-hydroxypropane-N,N,N',N'-tetraacetic Acid (DHPTA) with Heavy Lanthanides (Tb3+, Ho3+, Lu3+) in Aqueous Solution vol.49, pp.2, 1994, https://doi.org/10.1007/s10953-020-00950-y