Abstract
Abstract The Co K-edge XANES (X-ray Absorption Near-Edge Structure) of [Co(edta)]− (edta4−=ethylenediamine-N,N,N′,N′-tetraacetate) complex in crystal varies with the kind of counter cations and it also varies with the kind of solvents when it is dissolved. The amplitude of the oscillation in its EXAFS (Extended X-ray Absorption Fine Structure), or the peak height in its Fourier transform, also varies as much as threefold depending on the kind of counter cations or solvents. The most plausible cause for the variations is the difference in the thermal disorder of the bonds which is enhanced by the formation of hydrogen bonding between carboxylato groups in the complex and the water molecules in crystal or the solvent molecules in solution.
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