Mouml;ssbauer resonance experiments have been carried out at 4.2deg;K on CsI3and the trihyphen;iodide complexes of benzamide and amylose. The data unambiguously demonstrate the existence of inequivalent iodine atoms in the trihyphen;iodide ions of each species. For all three compounds, the quadrupole couplings of the central iodines are similar and indicate a small positive charge on the atom. The terminal iodine atoms are negatively charged, and in CsI3are significantly different from those in the benzamide and amylose complexes. The close relationship between the Mouml;ssbauer spectra of benzamidendash;HI3and amylosendash;I3supports a similar configuration of the trihyphen;iodide ions in these helical complexes, as predicted by a previous model of the blue starchndash;iodine complex.
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