Novel benzimidazolium–urea-based macrocyclic fluorescent sensors: synthesis, ratiometric sensing of H2PO4− and improvement of the anion binding performance via a synergistic binding strategy

Abstract

A modular approach to obtain benzimidazolium-urea-based, fluorophore-appended macrocyclic receptors was developed. This class of receptors could be used as selective ratiometric fluorescent sensors for H2PO4(-) due to the synergistic binding effect of benzimidazolium and urea moieties.

A benzimidazolium-based organic trication: a selective fluorescent sensor for detecting cysteine in water

“…In this context, benzimidazolium and imidazolium cations are aptly suited to act as receptors. [30][31][32] These organic cations have acidic hydrogens that are readily available for hydrogen bonding.…”

An Elaborate Supramolecular Assembly for a Smart Nanodevice for Ratiometric Molecular Recognition and Logic Gates

“…Chem.E ur.J. 2016,22,[8339][8340][8341][8342][8343][8344][8345] www.chemeurj.org been successfully functionalized with SC4A based on supramolecular interactions ( Figure S7 in the Supporting Information).…”

“…[21] Developing selective and cost-effective phosphate recognition probes that work under physiological conditions is important for phosphate-related biomedical diagnosis and environmental remediation. [22] In bio-systems (pH 7.4), H 2 PO 4 À and HPO 4 2À commonly coexisted and are at ad ynamic equilibrium state. Thus, we chose H 2 PO 4 À as an example to illustrate the detecting ability of our nanoprobe.F igure 3a shows that the green fluorescence of Tb 3 + is quenched in the presence of H 2 PO 4 À ,b ut the blue fluorescenceo ft he CDots (l em = 440 nm) remains constant.T he other anions (AcO À ,B F 4 À ,P F 6 À ,B r À ,C 2 O 4 2À ,C F 3 SO 3 À ,C lO 4 À ,C O 3 2À ,F À , HCO 3 À ,H SO 4 À ,I À ,S CN À ,a nd SO 4 2À ,2 5 mm)t ested in this system do not exert significant quenching effects on the fluorescence intensity of the nanoprobe (Figure3b, dark-colored bars).…”

A benzimidazolium-based mixed organic–inorganic polymer of Cu(II) ions for highly selective sensing of phosphates in water: applications for detection of harmful organophosphates

“…The resulting mixture was refluxed for 5 h, and the solution was cooled to room temperature. The pH of the solution was adjusted to 2e3, resulting in precipitation of white solids: 1 H NMR (DMSO-d 6 Binding studies were performed at 25AE1 C, and solutions were shaken for a sufficient time before recording emission spectra. All recognition studies were carried out in water.…”