Na(I) binding by tartaric acid derivatives

Academic Article

Abstract

  • A study of the binding of Na by two readily available tartaric acid derivatives, dimethyl tartrate and dipyrrolidine tartramide, has been carried out. These binding studies reveal binding stoichiometries of 1:1 for the dimethyl tartrate and 2:1 for the dipyrrolidine tartramide, and binding affinities (association constants) of 6.61 M for the dimethyl tartrate and 70.4 M for the dipyrrolidine tartramide indicating weak binding of Na in both cases. An X-ray crystal structure of a NaI complex of dipyrrolidine tartramide has also been determined. The binding stoichiometry is 1:1 in the solid state as opposed to the 2:1 binding stoichiometry that is observed in solution. The 1:1 binding in the solid state results in a coordination polymer in which half of the carbonyl oxygens and half of the hydroxy oxygens of the dipyrrolidine tartramide ligand bridge between adjacent Na cations. This allows each Na cation to achieve an octahedral coordination geometry. The iodides are ordered in a linear fashion, and each column of iodides is separated from the other columns by the coordination polymer and by linear columns of water molecules. © 2009 Elsevier B.V. All rights reserved. + -1 -2 + + +
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    Author List

  • Owens SB; Freeman JL; Gray GM
  • Start Page

  • 2977
  • End Page

  • 2981
  • Volume

  • 362
  • Issue

  • 9