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The structures of 18-crown-6 (18C6) complexes with K+ and Rb+ in methanolic solutions have been studied by X-ray absorption fine structure (XAFS) at the Br K-edge as well as at the K and Rb K-edges. The XAFS spectrum at the K or Rb K-edge has indicated that either Br− or solvent (methanol) molecules are present in the first coordination shell of K+ or Rb+ complexed by 18C6. However, the spectra obtained...
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