An efficient sensor for relay recognition of Zn2+ and Cu2+ through fluorescence ‘off–on–off’ functionality

A fluorescent sensor based on bicarboxamidoquinoline for highly selective relay recognition of Zn2+ and citrate with ratiometric response

“…Importantly, 1 could distinguish Zn 2+ from Cd 2+ , which was well known to be a major obstacle [22][23][24]. The enhancement emission might arise from the occurrence of the chelation-enhanced fluorescence (CHEF) process upon binding to Zn 2+ [19,25,26]. And the red-shift might result from the ICT process which was promoted by the deprotonation of amide NH after binding to Zn 2+ [17].…”

“…Based on the strategy, a ratiometric sensor for a metal ion is necessary, and then the metal ion bonded with the sensor can be exactly captured by citrate while a reverse spectrum change appears. In consideration of our previous work about ratiometric zinc sensor [16,17] and some related researches [18][19][20], a new sensor was designed and synthesized as shown in Scheme 1. The sensor is based on bicarboxamidoquinoline groups which are connected to the binaphthol scaffold through ethylenediamine linkers.…”

A selective and sensitive fluorescent sensor for cysteine detection based on bi‐8‐carboxamidoquinoline derivative and Cu2+ complex

“…[29,30] Bi-8-carboxamidoquinoline derivatives containing O, N, N coordinating sites exhibit high affinity to metal ions. [31] Furthermore, they exhibit good photostability and can be synthesized easily. [32,33] Consequently, the bi-8-carboxamidoquinoline derivatives seem to be ideal ligands in company with metal ions to form the high selectivity sensing ensemble system for Cys.…”

Synthesis of a BINOL Derivative Fluorescent Sensor S-N,N'-(2,2'-dimethoxy-[1,1'-binaphthalene] -6,6'-diyl)bis (ethane-1,2-diamine)

“…As the advantages of highly sensitivity, highly selectivity and convenient operation, fluorescent probe is widely used for detecting of cation, anion and neutral molecule [1][2][3][4][5][6]. Optically active fluorescent sensors are also having increased attentions because they can provide real time analysis for the enantiomeric composition of chiral compounds and enhance the sensitivity in the detection of chiral substrates [7][8][9][10][11][12][13][14][15].1-(2-hydroxynaphthalen-1-yl)naphthalen-2-ol, popularly known as BINOL, has the phenomenon of atropisomerism, one stereoisomerism finding in systems where the rotation around a single bond which is restricted to yield different stereoisomers. Among the enantioselective fluorescent sensors synthesized, which based on chiral structure of 1,10-bi-2-naphthol (BINOL) have been highly investigated, and a few highly enantioselective fluores-cent sensors have been found for the recognition of R-hydroxycarboxylic acids, chiral amines, amino acids and amino alcohols.…”