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Cyclophanes based on imidazolium or benzimidazolium groups were synthesized as anion recognition motifs by quaternarization of the bridged imidazole or benzimidazole compounds with dibromides in acetonitrile under reflux with high dilution. X-Ray analysis showed that C-H...Br - hydrogen bonds connected the hydrogen atoms of the cationic imidazolium rings, the m-xylene ring and the spacer of...
Synthesis and anion recognition properties of 2,2′-binaphthalene derivatives bearing two thiourea (1) and urea (2) groups at 8- and 8′-positions were studied. The structure of receptor 1 was determined by X-ray crystallography. UV–vis spectra of the receptors showed characteristic changes around 300–400nm through isosbestic points upon the addition of biologically relevant anions such as acetate,...
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