Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
권호 표지

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
Download PDF
⟨ Previous Next ⟩

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.

2,6-diformyl-p-creso1(DFPC)로부터 합성한 Ln-거대고리([20]DOTA) 착물, [Ln([20]DOTA)(NO3)(H2O)](NO3)2 xH2O{Ln(III)=Pr, Sm, Gd, Dy}를methanol용매에 2일정도 정치함으로써 [Ln([20]DOTA)(NO3)(CH3OH)]2+을 얻을 수 있다. 이 lanthanide-거대고리 착물에서 배위 된 CH3OH이 주게원자가 N인 보조리간드,La(=한자리 리간드;pyidine, imidazole, triethylamine, diethylamine, piperidine)에 의해 치환될 때 평형상수(K)를 25 oC, ㅒ=0.1M에서 분광학적 방법으로 결정하였다. 보조리간드의 pKa는 pyridine

Keywords

References

  1. Biochem. Biophys. Acta v.1204 Tiraya, T.;Miyoshi, S;Mori, M.;Wada, K.
  2. Proc. R. Soc. London. Ser. A. v.303 Lenhert, P. G.
  3. Acta Crystallogr. v.B49 Bouqiere, J. P.;Lehmann, M.S.
  4. Biochemistry v.34 Marsh, E. G. N.
  5. J. Chem. Soc. Dalton Trans. Asperger, S.;Orhanovic, M.
  6. J. Am. Chem. Soc. v.114 Safo, M. K.;Gupta, G. P.
  7. Inorg. Chem. v.35 Asperger. S.
  8. Photochem. Photobiol. v.52 Balzami, V.;Ballardini, R.
  9. Photochem. Photobiol. v.52 Davidson, R. S.;Hilchembach, M.M.
  10. Pure Appl. Chem. v.64 Desvergne, J. P.;Fages, F.;Marsau, P.
  11. Bull. Chem. Soc. Jpn. v.57 Shozo, T.
  12. J. Inorg. Chim. Acta. v.118 Kahwa, A.;Laine, P. A.;Selbin, J.
  13. Inorganica Chemica Acta. v.238 Suresh Kumar, D;Alexander, V.
  14. Inorg. Chem. v.33 Karen, D. M.;Kahwa, I. A.
  15. J. Chem. Educ. v.47 Moeller, T.
  16. Inorganic Chemistry Bowser, J. R.
  17. Concise Inorganic Chemistry(4th Ed.) Lee. J. D.
  18. J. Chem. Soc. Dalton Trans. Mohamed, S. A. H.;John, M. P.
  19. Inorg. Chem. v.34 Gisselbrecht, J. P.;Vogel, E.