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A series of disubstituted urea, thiourea and dansyl amide calix[4]arene based anion receptors have been prepared and characterised by X-ray crystallography. The structures show a fine balance of intramolecular urea α-tape, and urea⋯calixarene phenolic oxygen atom hydrogen bonding patterns. Both motifs are in competition with the anion binding behaviour of the compounds in solution.
N. Qureshi, D. S. Yufit, K. M. Steed, J. A. K. Howard and J. W. Steed, CrystEngComm, 2014, 16, 8413 DOI: 10.1039/C4CE01240B
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