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

Prabha, D.; Singh, Devender; Kumar, Pramod; Gupta, Rajeev

doi:10.1021/acs.inorgchem.1c02479

Cited by 23 publications

(22 citation statements)

References 97 publications

(285 reference statements)

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“…In contrast, L2 exhibited the emission peak centred at 520 nm after being excited at λ ex = 340 nm (Figure S10b). Quantum yields for chemosensors L1 and L2 were found to be 0.15 and 0.02, respectively using quinine sulphate as a reference (Φ st =0.54) [38,61,62] . A comparison of quantum yields suggests that introduction of methylene spacer (‐CH 2 ‐) between the imine and pyrene ring has significantly decreased the quantum yield of L2 as compared to L1 .…”

Section: Resultsmentioning

confidence: 98%

“…Any chemosensor should also exhibit strong and stable fluorescence so that it can be used for the practical applications including biological and environmental monitoring. Thus, the fluorescence stability of both L1 and L2 as well as solution‐generated species, L1 ‐Cu and L2 ‐Zn, was evaluated upto 6 h. In all cases, insignificant emission intensity change with time asserted their stable nature (Figure S17) [62] …”

Section: Resultsmentioning

confidence: 99%

“…Similarly, a large quenching constant (K SV ) of 3.46 × 10 5 M À 1 was calculated from the Stern-Volmer plot of L1 with the Cu 2 + ion (Figure S11). [62] The limit of detection (LOD) for L1 towards the Cu 2 + ion was found to be ChemistrySelect 120 nM. [38,66] On the other hand, binding constant and LOD of L2 towards the Zn 2 + ion was found to be 0.43 × 10 4 M À 1 and 130 nM, respectively (Figure S12).…”

Section: Detection Of Cu 2 + and Zn 2 + Ionsmentioning

confidence: 99%

“…Quantum yields for chemosensors L1 and L2 were found to be 0.15 and 0.02, respectively using quinine sulphate as a reference (Φ st = 0.54). [38,61,62] A comparison of quantum yields suggests that introduction of methylene spacer (-CH 2 -) between the imine and pyrene ring has significantly decreased the quantum yield of L2 as compared to L1. It is clear that the introduction of the -CH 2 -group breaks the conjugation between the coumarin and pyrene rings in case of L2.…”

Section: Photophysical Properties Of Chemosensors L1 and L2mentioning

confidence: 99%

“…Thus, the fluorescence stability of both L1 and L2 as well as solutiongenerated species, L1-Cu and L2-Zn, was evaluated upto 6 h. In all cases, insignificant emission intensity change with time asserted their stable nature (Figure S17). [62] pH Effect…”

Section: Selectivity and Sensitivitymentioning

confidence: 99%

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Methylene Spacer Mediated Detection Switch Between Copper and Zinc Ions by Two Coumarin‐Pyrene Based Chemosensors

Singh

Annan

Kumar³

et al. 2022

ChemistrySelect

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Pyrene linked‐coumarin based fluorescent chemosensors L1 and L2 are utilized for the selective detection of Cu2+ and Zn2+ ions, respectively. Both chemosensors differed by a methylene spacer that connects the coumarin and pyrene rings through an imine group. The inclusion of methylene spacer dramatically changed the detection profiles of two chemosensors. While L1 showed fluorescence “turn‐off” response towards the Cu2+ ion; L2 showed “turn‐on” emission enhancement with the Zn2+ ion. Both chemosensors illustrated nano‐molar detection limits and were selective even in the presence of other competing metal ions. The 1 : 1 stoichiometry between a chemosensor and Cu2+/Zn2+ ion was supported by the binding studies, Job's plot, NMR spectral titrations, mass spectra and density functional theory (DFT) studies. The detection ability of both chemosensors was utilized by fabricating the filter paper test‐strips as well as polystyrene films for quick and visual monitoring of these ions in different water samples. Chemosensor L2 was further utilized for the “turn‐on” detection of Zn2+ ion in HepG2 cells whereas solution generated L2‐Zn species functioned as a secondary chemosensor for the detection of cystine, an important amino acid.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Detection Of Cu 2 + and Zn 2 + Ionsmentioning

confidence: 99%

Section: Photophysical Properties Of Chemosensors L1 and L2mentioning

confidence: 99%

Section: Selectivity and Sensitivitymentioning

confidence: 99%

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Methylene Spacer Mediated Detection Switch Between Copper and Zinc Ions by Two Coumarin‐Pyrene Based Chemosensors

Singh

Annan

Kumar³

et al. 2022

ChemistrySelect

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Benzo‐γ‐pyrone‐based diorganotin (IV) chelates as fluorescent probes for the detection of picric acid from soil and aqueous samples

Kaur

Gupta

Singh³

et al. 2022

Applied Organom Chemis

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Four chelates of diorganotin (IV) from benzo-γ-pyrone ligands have been derived and their structural features are investigated. Benzo-γ-pyrone ligands (L 1 -L 2 ) behave as bidentate chelating agents and form [L 2 SnR 2 ] type of chelates (1-4; where L = ligand, R = C 4 H 9 , CH 3 ) with "skew-trapezoidal bipyramidal" arrangement. The fluorescent nature, electron-rich sites, and photostability of the test diorganotin (IV) chelate 1 make it a suitable probe for the recognition of picric acid (PA). The optimized analytical protocol demonstrates the detection limit of 45.19 nM of PA with a linear range of 0.49-12.66 μM and a quick response time of 10 s. Moreover, soil and aqueous sample analysis along with fabrication of SiO 2 @Al strips for the visual response display the real-time application of the synthesized chelate. The high recovery rate of 92.5% to 100.4% with significant precision of 0.36%-3.63% in real samples makes the probe a good chemosensor for the PA. Further stability of the synthesized compounds in water explored the tendency of the probe to detect PA in real aqueous samples.

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Coumarin‐Based Reversible Fluorescent Chemosensors for the Sequential Detection of Copper and Citrate Ions

2022

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Two novel coumarin-based Schiff-base chemosensors are presented. Courtesy to an extended conjugation between the coumarin ring and the attached π-containing groups, both chemosensors display noteworthy photo-physical properties including emission maxima at > 550 nm. Both chemosensors function as the selective sensors for the 'turn-off' detection of copper ion with the significant nanomolar detection limits. The sensing event was investigated through proton NMR and mass spectroscopy; pH studies; life-time and quantum yield measurements and DFT studies. The solution-generated [chemosensor-Cu] species illustrated remarkably selective secondary 'turn-on' detection of the citrate ion. The sequential detection of the copper and citrate ions have been utilized for the construction of logic gates as well as several low-cost detection methods.

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

Cited by 23 publications

References 97 publications

Methylene Spacer Mediated Detection Switch Between Copper and Zinc Ions by Two Coumarin‐Pyrene Based Chemosensors

Methylene Spacer Mediated Detection Switch Between Copper and Zinc Ions by Two Coumarin‐Pyrene Based Chemosensors

Benzo‐γ‐pyrone‐based diorganotin (IV) chelates as fluorescent probes for the detection of picric acid from soil and aqueous samples

Coumarin‐Based Reversible Fluorescent Chemosensors for the Sequential Detection of Copper and Citrate Ions

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