Pyrene-appended, benzimidazoliums-urea-based ratiometric fluorescent chemosensor for highly selective detecting of H2PO4−

Recent advances in H2PO4− fluorescent sensors

“…21) bearing benzimidazolium and urea groups was achieved. 66 This sensor was able to distinguish H 2 PO 4 À from other anions in CH 3 CN by displaying ratiometric uorescent sensing behaviour. Even though there are two pyrene rings per sensor molecule, the pyrene excimer was formed through an intermolecular pattern as illustrated in Fig.…”

“…Taking advantage of the strategy of anion-induced intermolecular p-p stacking, recently, in our group we also synthesised a series of acyclic and macrocyclic H 2 PO 4 À ratiometric uorescent sensors bearing benzimidazolium and urea groups as binding sites built on pyrene, acridine or anthracene uorophore. [66][67][68][69] Initially, the synthesis of a exible pyrene-based uorescent sensor 37 (Fig. 21) bearing benzimidazolium and urea groups was achieved.…”

Anion Recognition Employing ‐NH Linked Organic Moieties

“…Such binding is attributed to the simultaneous interplay of NÀ HÀ O and CÀ HÀ O hydrogen bonds as well as the complementary structure between H 2 PO 4 À and organic receptor. [46] Yong et al reported 2-thiohydantoin based organic receptor 21 bearing À NH and À OH functional groups. Receptor showed selective response towards Fions where color of solution changed from colorless to yellow.…”

“…A ratiometric response was recorded for 0–10 μM of H 2 PO 4 − ions and the limit of detection was calculated as 50 μM in CH 3 CN. Such binding is attributed to the simultaneous interplay of N−H−O and C−H−O hydrogen bonds as well as the complementary structure between H 2 PO 4 − and organic receptor [46] . Yong et al .…”

Imidazolium Based Probes for Recognition of Biologically and Medically Relevant Anions

“…Gao et al reported a probe 110 with pyrene as appended units for the selective detection of H 2 PO 4 − over other anions. The emission spectrum of 110 in acetonitrile showed the structured monomer emission (λ em 380 and 400 nm) and a strong excimer emission at 493 nm.…”