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The affinity of azacryptands towards perrhenate has been investigated by potentiometric, 1H NMR spectroscopic and ITC studies in aqueous solutions. The association constants could only be determined for the p‐xylyl and m‐xylyl azacryptands in the hexaprotonated form. The experimental results showed the outstanding affinity of the p‐xylyl cryptand for perrhenate, attributable to the geometric complementarity...
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