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Series of strapped calix[4]pyrroles designed to bind chloride and the crystal X-ray diffraction structures of the Cl− complex. The key CH···Cl− interaction is clearly depicted in the 3·Cl− crystal structure (bottom). The added aryl CH hydrogen bond interaction available in the phenyl-strapped system 3 binds Cl− stronger than an unsubstituted calix[4]pyrrole and the furan-strapped system 5.
