Binding Interaction of Captopril with Metal Ions: A Fluorescence Quenching Study

Siddiqi, K. S.; Bano, Shaista; Mohd, Ayaz; Khan, Aftab Aslam Parwaz

doi:10.1002/cjoc.200990295

Cited by 20 publications

(14 citation statements)

References 17 publications

(11 reference statements)

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“…As shown in table 2, the fluorescence intensity decreases in the order, Ni 2þ 4 Cu 2þ 4 Zn 2þ 4 Cd 2þ , in contrast with the order reported [33]. Probably, collisional quenching differences between the four complexes may be related to the structure of the complexes.…”

Section: Ir Spectracontrasting

confidence: 78%

Prolonging luminescent lifetimes by introducing bis(maleonitriledithiolato)metalate anions with a fluorescent organic cation

Wang

Chen

Liu

et al. 2011

Journal of Coordination Chemistry

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2012) Prolonging luminescent lifetimes by introducing bis(maleonitriledithiolato)metalate anions with a fluorescent organic cation, Journal of Coordination Chemistry, 65:1, 87-103, A new organic fluorescent ionic compound [MOBIP]I (1) (MOBIP þ ¼ 1-methyl-2-oxo-3 -(1H-benzimidazol-2(3H)-ylidene)-2,3-dihydropyridinium) was synthesized and used to prepare seven maleonitriledithiolate metal complexes [MOBIP] n [M(mnt) 2 ] by substitution of the iodide ion with [M(mnt) 2 ] nÀ (M ¼ Cu 2þ (2), Ni 2þ (3a), Ni 3þ (3b), Zn 2þ (4), Cd 2þ (5), Pd 2þ (6), and Pt 2þ (7)). An investigation of fluorescence properties shows that these complexes are a new series of solution luminescent complexes of maleonitriledithiolate derivatives with strong blue light fluorescence in daylight by irradiation with UV light with high quantum yields. They display similar symmetric emissions with em at the deep blue region of $426 nm upon excitation at $364 nm in DMF, caused by L-L transition of MOBIP þ . Existence of [M(mnt) 2 ] nÀ anions in the solution prolongs the fluorescent lifetimes. For all these compounds in the solid state, the fluorescent emission is blue-shifted and more narrow than that in solution. Based on their crystal structure analysis, the weak stacking interactions in compounds cause the difference of their fluorescence spectrum. Investigations of variable-temperature magnetic susceptibility indicate that 2 has weak antiferromagnetic coupling, while 3b exhibits stronger antiferromagnetic coupling.

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Section: Ir Spectracontrasting

confidence: 78%

Prolonging luminescent lifetimes by introducing bis(maleonitriledithiolato)metalate anions with a fluorescent organic cation

Wang

Chen

Liu

et al. 2011

Journal of Coordination Chemistry

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“…Among these thermodynamic parameters, the negative DG value implies that the interaction process between BPP and nickel(II) ion is spontaneous [25]. The positive DH value indicates that their interaction is an endothermic process, and the positive DS value also reveals the chelating characteristic of the chemosensor BPP with nickel(II) ion [26].…”

Section: Thermodynamic Parametersmentioning

confidence: 98%

A highly selective chemosensor for nickel(II) based on fluorescence quenching of a bispyrazole derivative

Yan

et al. 2016

Res Chem Intermed

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A novel bispyrazole, 2,6-bis(5-phenyl-1H-pyrazol-3-yl)-pyridine, was designed and synthesized. The bispyrazole showed extreme selectivity for Ni 2? over other metal ions such as ? in MeOH-H 2 O solution. The sensing sensitivity and binding properties of the bispyrazole for nickel(II) ion were investigated by fluorescent spectroscopic techniques. It was found that the bispyrazole possessed high selectivity and sensitivity toward Ni 2? over other metal ions. The binding stoichiometry was confirmed as 1:1 (bispyrazole/Ni 2? ) by Job plot experiment and the linearity of the Benesi-Hildebrand plot. The binding constants K and thermodynamic parameters (DH, DG, and DS) at different temperatures were obtained. Meanwhile, the detection limit of the bispyrazole for Ni 2? was determined to be 3.25 9 10 -7 mol L -1 .

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“…If the K SV decreased with increased temperatures, it could be concluded that the quenching process is not a dynamic quenching but a static quenching. [11][12][13] For dynamic quenching, the mechanism can be described by the Stern-Volmer equation:…”

Section: Fluorescence Quenching Spectra and Quenchingmentioning

confidence: 99%

“…The phase modulation method was used to obtain fluorescence lifetime. [11] The UV-vis absorption spectra were recorded with a UV-169 spectrophotometer (Elico Ltd., India). All potentiometric measurements were done with Elico-LI-120 pH meter.…”

Section: Apparatus and Reagentsmentioning

confidence: 99%

“…[10] Ultraviolet (UV)-visible spectroscopy have been widely used to study the interactions between the small molecules and biomacromolecules. [11] From the measurements and analyses of the fluorescence emission spectra, the fluorescence lifetime, fluorescence polarization, etc., a vast amount of information can be procured about the structural fluctuations and the microenvironment changes surrounding the fluorophore in the macromolecule. [12] In this study, the interaction of CFZ with metal ions has been investigated by using fluorescence emission spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Interaction of Clofazimine with Divalent Metal Ions: A Fluorescence Quenching Study

Mohd

Khan

Bano

et al. 2011

Journal of Dispersion Science and Technology

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The interaction of clofazimine (CFZ) with divalent metal cations was studied by measuring fluorescence quenching spectra, synchronous fluorescence spectra and ultraviolet spectra. The fluorescence quenching spectra of CFZ in the presence of metal ions showed that metal ions quenched the fluorescence of CFZ. The quenching constants were determined using the Stern-Volmer equation. The binding constants (log K) and binding site were obtained. The thermodynamic parameters obtained in this study revealed that the interaction between CFZ and metal ions was mainly driven by a hydrophobic force. The conformational changes of CFZ were investigated by synchronous spectrum studies.

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Binding Interaction of Captopril with Metal Ions: A Fluorescence Quenching Study

Cited by 20 publications

References 17 publications

Prolonging luminescent lifetimes by introducing bis(maleonitriledithiolato)metalate anions with a fluorescent organic cation

Prolonging luminescent lifetimes by introducing bis(maleonitriledithiolato)metalate anions with a fluorescent organic cation

A highly selective chemosensor for nickel(II) based on fluorescence quenching of a bispyrazole derivative

Interaction of Clofazimine with Divalent Metal Ions: A Fluorescence Quenching Study

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