Benzimidazolium-based flexible tripodal fluorescent chemosensor for selective sensing of dihydrogenphosphate and ATP

A new anthracene-coupled benzimidazolium-based tripodal, tricationic fluorescent chemosensor 1 was designed and synthesised. Receptor 1 exhibits high degree of selectivity towards in CH3CN through anion-induced quenching of emission along with the formation of a weak excimer complex in the excited states. Furthermore, receptor 1 shows selective sensing of ATP over ADP and AMP by exhibiting an increase in emission in aqueous CH3CN (CH3CN:H2O = 3:2 v/v). The electrostatic charge–charge interaction along with both conventional (N–H…X; X = O, halides) and unconventional (C+–H…X; X = O, halides) hydrogen bonding between the host and the guest molecule synergistically interplays in the complexation. The anion-binding properties of receptor 1 were understood by 1H NMR, UV–vis and fluorescence spectroscopic methods.

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