Chemical Equilibria of Lanthanides{Ln(III)=Pr, Sm, Gd, Dy}-Macrocyclic Complexes with Monodentate Ligands in $CH_3$OH(Part I)

$CH_3$OH용매에서 란탄족 원소{Ln(III)=Pr, Sm, Gd, Dy}-거대고리 착물과 한자리 리간드 간의 화학평형(제1보)

  • 변종철 (Department of Chemistry, Cheju National University) ;
  • 박유철 (Department of Chemistry, Kyungpook National University) ;
  • 박신복 (Department of Chemistry, Cheju National University)
  • Published : 19990600

Abstract

Ln-macrocyclic([20]DOTA) complexes, [Ln([20]DPTA)(NO_{3})(H_{2}O)](NO_{3})_{2} \cdotxH_{2}O{Ln(III)=Pr, Sm, Gd, Dy}, which had been synthesized from 2, 6-diformyl-p-cresol(DFPC), was placed in methanol for 2 days, and $[Ln([20]DPTA)(NO_{3})(CH_{3}OH)]^{2+}$ was formed. The equilibrium constants(L) for the substitution of coordinated $CH_{3}OH$ in the Ln-[20]DOTA complexes by various auxiliary ligands, $L_{a}(=monodentate ligands; pyridine, imidazole, triethylamine, diethylamine, piperidine) were determined spectroscopically at $25^{\circ}C$ and 0.1M. The pKa of auxiliary ligand is in the order of pyridine < imidazole < triethylamine < diethylamine < piperidine, however the K has shown the trend of pyridine < imidzole < diethylamine < piperidine < triethylamine.

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