Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Fluoride Binding Properties of Tris-pyridinium Borane

  • Lee, Kang Mun (Department of Chemistry, KAIST) ;
  • Kim, Yejin (Department of Chemistry and EHSRC, University of Ulsan) ;
  • Do, Youngkyu (Department of Chemistry, KAIST) ;
  • Lee, Junseong (Department of Chemistry, Chonnam National University) ;
  • Lee, Min Hyung (Department of Chemistry and EHSRC, University of Ulsan)
  • Received : 2013.03.23
  • Accepted : 2013.04.03
  • Published : 2013.07.20
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Abstract

A novel multi-cationic borane, tri-N-methylpyridinium substituted triarylborane, $[BAr^N_3]I_3$ ($[2]I_3$) ($Ar^N=4-(4-C_5H_4N-Me)-2,6-Me_2-C_6H_2$) was prepared from the corresponding neutral tris-pyridyl borane, $BAr_3$ (2a) ($Ar=4-(4-C_5H_4N)-2,6-Me_2-C_6H_2$). The crystal structure of 2a determined by X-ray diffraction study reveals the presence of tri-coordinate boron center with peripheral pyridyl moieties. The fluoride ion affinity of the cationic borane, $[2]I_3$ was investigated by UV-vis absorption titrations and was compared with that of neutral 2a. While 2a binds fluoride with the binding constant of $1.9{\times}10^2\;M^{-1}$ in $THF/H_2O$ (9:1 v/v) mixture, $[2]I_3$ shows a very high binding constant ($K=1.0{\times}10^8\;M^{-1}$) that is greater by six orders of magnitude than that of 2a in the same medium. This result indicates that the fluorophilicity of triarylborane can be drastically enhanced by multiple pyridinium substitutions.

Keywords

References

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