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-1 for the dimethyl tartrate and 70.4 M-2 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.
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    Author List

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

  • 2977
  • End Page

  • 2981
  • Volume

  • 362
  • Issue

  • 9