Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Kinetics of Complexation of Alkali Earth Metal Ions with 18-Crown-6-Ether in Methanol

  • Yun, Sock-Sung (Department of Chemistry and Department of Physics, Chungnam National University) ;
  • Kim, Seong-Heon (Quality control Department, korea Explosives Co., LTD) ;
  • Yang, Joon-Mook (Department of Chemistry and Department of Physics, Chungnam National University) ;
  • Choi, Ki-Young (Department of Chemistry, Mokwon College)
  • Published : 1989.04.20
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Abstract

The rates of complexation of the 18-C-6 (1,4,7,10,13,16-hexaoxacyclooctadecane) with $K^+,\;Ca^{2+},\;Sr^{2+},\;and\;Ba^{2+}$ in methanol solution have been determined at 25$^{\circ}C$ by a pressure-jump technique. The Eigen Winkler mechanism has been applied to interprete the kinetic data. The results suggest that the rate determining step of the complexation in methanol is the rearrangement of the ligand in the outer sphere ion-dipole pair to form a stable encapsulated complex of the metal ion by the crown ether.

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