Exchange Reaction Mechanism of $Pb(II)-N_2O_m$ Macrocyclic Complexes by $^{207}Pb-NMR$ Spectroscopy

$^{207}Pb-NMR$ 분광법에 의한 $Pb(II)-N_2O_m$계 거대고리 리간드 착물형성 반응의 교환 메카니즘

  • 김정 (서남대학교 화학과) ;
  • 윤창주 (성심여자대학 화학과) ;
  • 유한준 (고려대학교 이과대학 화학과) ;
  • 김건 (고려대학교 이과대학 화학과) ;
  • 김시중 (고려대학교 이과대학 화학과)
  • Published : 19940100

Abstract

Exchange reaction mechanisms of the Pb(II) ion for the complexes between Pb(II) ion and nitrogen oxygen donor macrocyclic ligands, such as 1,13-diaza-3,4 : $1011-dibenzo-59-dioxacyclohexa-decane(NtnOtnH_4)$, 1,15-diaza-3,4 : $1213-dibenzo-5811-trioxacycloheptadecane(NenOdienH_4)$, and 1,15-diaza-3,4 : $1213-dibenzo-5811-trioxacyclooctadecane(NtnOdienH_4)$, were studied by $^{207}Pb-NMR$ spectroscopy in N,N'-dimethylformamide(DMF) solutions. The associative-dissociative mechanism dominated in $NtnOtnH_4-Pb(II)$ and $NtnOdienH_4-Pb(II)$ system. For $NenOdienH_4-Pb(II)$ system, the bimolecular exchange mechanism prevailed below $-5^{\circ}C$, and both bimolecular exchange and associative-dissociative mechanism dominated above $+5^{\circ}C.$ The order of activation energies for dissociation was $NtnOdienH_4\;<\;NtnOtnH_4\;<\;NenOdienH_4$ which was reverse to the order of stabilities.

Keywords

References

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