The urea and thiourea groups in these compounds are capable of forming strong hydrogen bonds with various anions, such as fluoride (F-), chloride (Cl-), bromide (Br-), iodide (I-), and sulfate (SO4^2-). The specific choice of functional groups can be tuned to enhance selectivity for particular anions.
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(R)-N-(1-phenylpentyl)benzamide
5,5’-methylene-bis-(3-methoxy-salicylaldehyde)
