A novel cryptand-like anion receptor was synthesized in reasonable yield by a one-step condensation reaction. The UV-vis spectroscopic titrations indicated that cryptand bound AcO in preference to other monovalent anions (including its competing F and HPO) in CHCN, generating a 1:1 binding complex with = 51,000 M. Moreover, the crystal structures revealed that the acetate ion was encapsulated inside the cryptand's cavity in a 1:1 manner, through multiple N-H···O hydrogen bonds (although having two different crystal forms).
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