A Cu fluorescent chemosensor suitable for quantitative detection of tyrosinase in potatoes over a wide pH range.

Cu as an important trace element plays an essential role in various biologic processes due to the unique redox active nature. For this reason, much effort has been made to develop effective methods for Cu detection. In this study, a novel structure fluorescent chemosensor, 1-(6-(((5-(5, 5-difluoro-1, 3, 7, 9-tetramethyl-5H-4λ, 5λ-dipyrrolo[1, 2-c:2', 1'-f][1, 3, 2] diazaborinin-10-yl)quinolin-8-yl)oxy)methyl)pyridin-2-yl)-N, N-bis(pyridin-2-ylmethyl)methanamine (1), was synthesized and characterized by H and C nuclear magnetic resonance spectroscopy, and electrospray ionization mass spectrometry.

A novel fluorescent sensor for specific recognition of GSH based on the copper complex and its bioimaging in living cells.

Given the important role of biothiols in various physiological processes, there is a need to develop novel fluorescent sensors for detecting them. Herein, a novel "on-off-on" fluorescent sensor (E)-N'-((7-(diethylamino)-2-oxo-2H-chromen-3-yl)methylene)-6-((quinolin-8-yloxy)methyl)picolinohydrazide (PQC) was synthesized and its absorbance and fluorescence properties were characterized. The sensor PQC could form a stable complex and showed a significant fluorescence quenching response to Cu with a quenching efficiency of approximately 100%, and the PQC-Cu complex showed a fluorescence enhancement response to GSH with a higher recovery rate of above 80% in a CHOH/HEPES (9:1 v/v, pH = 7.

A simple fluorescent probe for detection of Ag and Cd and its Cd complex for sequential recognition of S.

In this study, we designed and synthesized a simple probe 2-(8-((8-methoxyquinolin-2-yl)methoxy)quinolin-2-yl)benzo[]thiazole (DQT) for detection of Ag and Cd in a CHOH/HEPES (9 : 1 v/v, pH = 7.30) buffer system. Its structure was characterized by NMR, ESI-HR-MS and DFT calculations, and its fluorescence performance was also investigated.

A novel fluorescent chemosensor based on coumarin and quinolinyl-benzothiazole for sequential recognition of Cu and PPi and its applicability in live cell imaging.

In this study, a highly selective fluorescent sensor (E)-2-((2-(benzo[d]thiazol-2-yl)quinolin-8-yl)oxy)-N'-((7-(diethylamino)-2-oxo-2H-chromen-3-yl)methylene)acetohydrazide (TQC) was synthesized from 2-methylquinolin-8-ol and 4-(diethylamino)-2-hydroxybenzaldehyde and its structure was characterized by H NMR, C NMR, ESI-HR-MS and density functional theory (DFT) calculation. Sensor TQC showed an obvious "on-off-on" fluorescence response to Cu and PPi in a DMSO/HEPES (3:2 v/v, pH = 7.4) buffer system.

A BODIPY-Based Water-Soluble Fluorescent Probe for Naked Eye Detection of pH.

In this study, a BODIPY-based water-soluble fluorescent chemosensor BBP has been synthesized using BODIPY as the fluorescence group and quinoline as the recognition group. BBP can be used for naked eye detection of pH in complete aqueous solution and it shows high specificity in a wide range of cations. The pKa value is determined to be 2.

A chemosensor with a paddle structure based on a BODIPY chromophore for sequential recognition of Cu and HSO.

In this study, a highly selective chemosensor ML based on a BODIPY fluorescent chromophore was synthesized for sequential recognition of Cu and HSO in a CHOH/HO (99 : 1 v/v) system, which contained three recognition sites and its structure characterized by H NMR, C NMR and ESI-HR-MS. The sensor ML showed an obvious "on-off" fluorescence quenching response toward Cu and the ML-Cu complex showed an "off-on" fluorescence enhancement response toward HSO . The detection limit of the sensor ML was 0.

A highly sensitive and selective chemosensor for Pb based on quinoline-coumarin.

In this study, a highly sensitive and selective fluorescent chemosensor, ethyl()-2-((2-((2-(7-(diethylamino)-2-oxo-2-chromene-3-carbonyl)hydrazono)methyl)quinolin-8-yl)oxy)acetate (1), was synthesized and characterized by H NMR, C NMR and ESI-MS. Sensor 1 showed an "on-off" fluorescence response to Pb with a 1 : 1 binding stoichiometry in CHCN/HEPES buffer medium (9 : 1 v/v). The detection limit of sensor 1 to Pb was determined to be 0.