A coumarin based fluorescent probe enabling nanomolar detection of Zn2+ and Cu2+

Interrogating the nature of aggregates formed in a model azine based ESIPT coupled AIE active probe: stark differences in photodynamics in the solid state and aggregates in water

“…As discussed, the low quantum yield value of BNHMP in the two organic solvents was an outcome of the free rotation of the azine linkage, thereby activating non-radiative decay channels. [45][46][47] Since the viscosity of water (Z = 0.80 mPa) is considerably higher than either DCM (Z = 0.44 mPa) and THF (Z = 0.46 mPa), the freezing of the free rotation of the azine linkage in water could trigger the observed increment of the emission intensity of BNHMP in water only by bringing about the Restriction of Intramolecular Rotation (RIR) without any AIE. 4 To verify each probability, steady state emission spectra were recorded in two other solvents, viz ethanol and polyethylene glycol-400 (ESI, † Fig.…”

Imidazole-assisted film-based fluorescent sensor for the ultrasensitive detection of hydrazine

“…Considering the above facts and taking advantage of our past research interest and experience towards the sensing of volatile compounds, 53,54 environmentally important analytes 55,56 and stimuli responsive gels, a successful attempt has been made to design and synthesize fluorescent probes 2-(4- (5,6-…”

“…Considering the above facts and taking advantage of our past research interest and experience towards the sensing of volatile compounds, 53,54 environmentally important analytes 55,56 and stimuli responsive gels, a successful attempt has been made to design and synthesize fluorescent probes 2-(4-(5,6-dichloro-1 H -benzo[ d ]imidazol-2-yl)-benzylidene)malononitrile ( R-1 ) and ethyl( E )-2-cyano-3-(4-(5,6-dichloro-1 H -benzo[ d ]imidazole-2yl)phenyl) acrylate ( R-2 ) for their sensing behaviours towards hydrazine (Scheme 1).…”

A benzimidazole-derived fluorescent chemosensor for Cu(ii)-selective turn-off and Zn(ii)-selective ratiometric turn-on detection in aqueous solutions

“…Hence, it is of great significance to develop highly selective and sensitive fluorescent chemosensor to quantitatively detect Cu 2+ and Zn 2+ in biological and environmental fields. In this regard, fluorescent sensors for Cu 2+ and Zn 2+ detection have been designed based on various coordination scaffolds [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. For example, a naphthalene Schiff-base has been designed as a fluorescent sensor for Cu 2+ and Zn 2+ , where the fluorecence of sensor was quenched by Cu 2+ or enhanced by Zn 2+ over other metal cations in DMSO, respectively [11].…”

“…In this regard, a number of fluorescent sensors for Cu 2+ and Zn 2+ detection have been designed based on various coordination scaffolds. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] For example, a naphthalene Schiff-base system was designed as a fluorescent sensor for Cu 2+ and Zn 2+ , where the fluorescence of the sensor was quenched by Cu 2+ or enhanced by Zn 2+ over other metal cations in DMSO, respectively. 11 Kim et al reported a phenanthrene-based multifunctional chemosensor that showed a slightly enhanced and blue-shifted (45 nm) fluorescence emission in the presence of Zn 2+ , whereas Cu 2+ caused a serious quenching of the original fluorescence.…”