Fluorescent detection of multiple ions by two related chemosensors: structural elucidations and logic gate applications

Abstract

Two related chemosensors L1 and L2 display selective detection of multiple ions (Cu2+, Al3+, Cd2+ and S2−) as a result of minor variation of functional groups at a remote arene ring.

Selective Detection of Picric Acid and Pyrosulfate Ion by Nickel Complexes Offering a Hydrogen-Bonding-Based Cavity

“…For the detection of nitroaromatics, a solution of nitrobenzene (NB), phenol, benzoic acid (BA) cyclotrimethylenetrinitramine (RDX), 1,3-dinitrobenzene ( The detection limit 35−48 was calculated by using eq 1, where σ is the standard deviation of 10 blank emission measurements of nickel complexes 1−3 and k is the slope of a plot of emission of complexes 1−3 versus [picric acid]. The binding constant (K b ) was determined from the ratio of intercept and slope of the straight line of the Benesi−Hildebrand plot [35][36][37][38][39][40][41][42][43][44][45][46][47][48]93 of 1/(I − I 0 ) versus 1/[PA] (eq 2), where I 0 and I are the emission of complexes 1−3 in absence and in the presence of PA, respectively, and I min is the minimum emission in the presence of PA. (quinine sulfate, Φ st = 0.54). A st and A u denote the absorbance of the standard and the sample, respectively.…”

“…Such detection limits are noteworthy and place the present chemosensors in the category of highly efficient sensors. [35][36][37][38][39][40]48 Similarly, high binding constants (K b ; 10 4 M −1 ) were found from the B−H plots: 2.21, 3.59, and 2.92 for complexes 1−3, respectively. We then evaluated the interaction of all three nickel complexes with S 2 O 7 2− ion by fluorescence spectroscopy (Figure S26).…”

“…However, complex 3 allowed us to calculate the binding constant (K b ) for the S 2 O 7 2− ion which was found to be 1.95 × 10 4 M −1 (Figure S27). [35][36][37][38][39][40]48 Mechanistic Investigations. All three Ni(II) complexes were able to selectively detect PA from various NACs and S 2 O 7 2− ion from assorted anions as confirmed by both absorption and emission spectral studies.…”

Zn‐ and Cd‐based Coordination Polymers Offering H‐Bonding Cavities: Highly Selective Sensing of S2O72− and Fe3+ Ions

“…Notably, a bright yellow colored clear solution was observed in presence of Fe 3+ ion (Figure S27). To check interference from other metal ions during the detection of Fe 3+ ion, an equimolar amount of both Fe 3+ ion and other metal ions was used . Gratifyingly, none of the cations interfered in the detection of Fe 3+ ion (Figure S28).…”

Recent progress in cadmium fluorescent and colorimetric probes

“…19 ) with biphenyl as the fluorophore and carboxylic acid group as the binding site. 68 In CH 3 OH solution, under excitation at 320 nm, sensor 54 emits strong fluorescence at 418 nm. Adding Cd 2+ made the fluorescence emission peak blue-shift of sensor 54 by 25 nm and the fluorescence be quenched.…”