A fluorescence enhancement-based sensor for hydrogen sulfate ion

Abstract

Sugar-aza-crown ether-based cavitand 1 can act as a selective turn-on fluorescence sensor for hydrogen sulfate ion in methanol among a series of tested anions. Spectroscopic studies, particularly NMR spectroscopy, revealed that the C-H hydrogen bonding between 1,2,3-triazole ring of cavitand 1 and hydrogen sulfate ion is crucial for the high selectivity of the receptor for hydrogen sulfate.

Substitution Pattern Reverses the Fluorescence Response of Coumarin Glycoligands upon Coordination with Silver (I)

“…For DT1 , two triazolyl coumarin arms that belong separately to two FG molecules coordinate with one silver ion through both the carbonyl groups of coumarin and nitrogen atoms of triazole, leading to a CHEF (chelation-enhanced fluorescence)-like mechanism. This is similar to a chelation mode recently described between a triazolyl coumarin-based chemo-probe and a heavy metal36, as well as to some other simulated motifs including constrained glycoligands in complex with heavy metals3738. In contrast, as only the triazole groups are in coordination with silver, the FL quenching of DT3 could be possibly ascribed to a heavy metal effect1539.…”

RETRACTED: Synthesis and studies of selective chemosensor for naked-eye detection of anions and cations based on a new Schiff-base derivative

“…The synthesis of chemosensors for the recognition of harmful and toxic ions is very important challenge, nowadays [24][25][26][27][28][29][30][31][32][33]. Cation receptors have been studied extensively, whereas anion receptors have received less attention.…”

Fluorescence Chemosensor for HSO4 − Ion Based on Pyrrole-Substituted Salicylimine Zn2+ Complex: Nanomolar Detection

“…A maximum emission was reached when the molar . Moreover, a minimum detection limit of 40 nM was achieved for HSO 4 − by receptor 4, which was much lower than the maximum allowable our previous reported detection limit [17,18]. All optimization studies were carried out by using B3LYP/ 631G basis set on Gaussian 09 program [19][20][21].…”