A series of trinuclear zinc(<scp>ii</scp>) complexes with reduced Schiff base ligands: turn-off fluorescent chemosensors with high selectivity for nitroaromatics

Karmakar, Mainak; Roy, Sasanka; Chattopadhyay, Shouvik

doi:10.1039/c9nj02060h

Cited by 52 publications

(19 citation statements)

References 72 publications

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“…12 It is also known, that the d 10 conguration of the zinc(II) cation results of the occurrence only MLCT, LMCT or p / p* ligand based transitions regarding the spectroscopy and photochemistry of zinc(II) compounds. [13][14][15][16][17] Moreover, the type of an amine used 22 and signicance of the rst coordination sphere of the central atom are responsible for the emission properties of the isolated compounds. 18,19 Therefore the main factor, which allows to control the luminescence properties of complexes can be design of the Schiff bases part of the complexes.…”

Section: Introductionmentioning

confidence: 99%

New dinuclear zinc(ii) complexes with Schiff bases obtained from o-phenylenediamine and their application as fluorescent materials in spin coating deposition

et al. 2021

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Section: Introductionmentioning

confidence: 99%

New dinuclear zinc(ii) complexes with Schiff bases obtained from o-phenylenediamine and their application as fluorescent materials in spin coating deposition

et al. 2021

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“…[11][12][13] To show strong uorescence is a typical behaviour of any zinc(II) complex, and the uorescence intensity usually decreases in presence of different nitroaromatic compounds. [14][15][16][17] So, many zinc(II) complexes have been used for the detection of nitroaromatic explosives by turn off uorescence response. [18][19][20] The d 10 electronic conguration of zinc(II) also favours a variety of coordination geometries, e.g.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a mononuclear zinc(ii) Schiff base complex: on the importance of C–H⋯π interactions

2021

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“…Hence, a sensing methodology based on weak interactions in the second coordination sphere would be more appropriate. 82,83 However, there are many examples of metal–organic frameworks showing excellent sensitivity toward nitroaromatics. 79 The examples of small metal complexes to do so are relatively less.…”

Section: Resultsmentioning

confidence: 99%

Copper(II), Zinc(II), and Cadmium(II) Formylbenzoate Complexes: Reactivity and Emission Properties

2019

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Synthesis, characterization, reactivity, and sensing properties of 4-formylbenzoate complexes of copper(II), zinc(II), and cadmium(II) possessing the 1,10-phenanthroline ancillary ligand are studied. The crystal structures of the (1,10-phenanthroline)bis(4-formylbenzoate)(aqua)copper(II) and (1,10-phenanthroline)bis(4-formylbenzo-ate)zinc(II) and a novel molecular complex comprising an assembly of mononuclear and dinuclear species of (1,10-phenanthroline)bis(4-formylbenzoate)cadmium(II) are reported. These zinc and cadmium complexes are fluorescent; they show differentiable sensitivity to detect three positional isomers of nitroaniline. The mechanism of sensing of nitroanilines by 1,10-phenanthroline and the complexes are studied by fluorescence titrations, photoluminescence decay, and dynamic light scattering. A plausible mechanism showing that 1,10-phenanthroline ligand-based emission quenched by electron transfer from the excited state of 1,10-phenanthroline to nitroaniline is supported by density functional theory calculations. In an anticipation to generate a fluorescent d10-copper(I) formylbenzoate complex by a mild reducing agent such as hydroxylamine hydrochloride for similar sensing of nitroaromatics as that of the d10-zinc and cadmium 4-formylbenzoate complexes, reactivity of d9-copper(II) with hydroxylamine hydrochloride in the presence of 4-formylbenzoic acid and 1,10-phenanthroline is studied. It did not provide the expected copper(I) complex but resulted in stoichiometry-dependent reactions of 4-formylbenzoic acid with hydroxylamine hydrochloride in the presence of copper(II) acetate and 1,10-phenanthroline. Depending on the stoichiometry of reactants, an inclusion complex of bis(1,10-phenanthroline)(chloro)copper(II) chloride with in situ-formed 4-((hydroxyimino)methyl)benzoic acid or copper(II) 4-(hydroxycarbamoyl)benzoate complex was formed. The self-assembly of the inclusion complex has the bis(1,10-phenanthroline)(chloro)copper(II) cation encapsulated in hydrogen-bonded chloride-hydrate assembly with 4-((hydroxyimino)methyl)benzoic acid.

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A series of trinuclear zinc(ii) complexes with reduced Schiff base ligands: turn-off fluorescent chemosensors with high selectivity for nitroaromatics

Abstract: A series of trinuclear zinc(ii) complexes have been synthesized and characterized by X-ray crystallography. The ability of the complexes to act as sensors for the detection of nitroaromatics in DMF has been assessed.

Cited by 52 publications

References 72 publications

New dinuclear zinc(ii) complexes with Schiff bases obtained from o-phenylenediamine and their application as fluorescent materials in spin coating deposition

New dinuclear zinc(ii) complexes with Schiff bases obtained from o-phenylenediamine and their application as fluorescent materials in spin coating deposition

Synthesis and characterization of a mononuclear zinc(ii) Schiff base complex: on the importance of C–H⋯π interactions

Copper(II), Zinc(II), and Cadmium(II) Formylbenzoate Complexes: Reactivity and Emission Properties

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