Speciation study of an imidazolate-bridged copper(II)–zinc(II) complex in aqueous solution

Szilágyi, István; Labádi, I.; Hernádi, Klára; Pálinkó, István; Nagy, Nóra Veronika; Korecz, L.; Rockenbauer, Antal; Kele, Zoltán; Kiss, Tamás

doi:10.1016/j.jinorgbio.2005.05.001

Cited by 39 publications

(31 citation statements)

References 47 publications

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“…Riboflavin, present in Citrullus lanatus Juice, contains polyphenol which might be responsible for the stabilization of AgNP. (Huang et al 2010;Prakash and Prakash 2011) and the peptide linkage (-CONH-) for formation of coordination complex with Cu ?2 (Garland 1973;Szilágyi et al 2005).…”

Section: Optimization Of Synthesized Agnpmentioning

confidence: 99%

Detection of heavy metals (Cu+2, Hg+2) by biosynthesized silver nanoparticles

2015

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Here, we are reporting two methods for detection of Cu ?2 ion and Hg ?2 ions using biosynthesized silver nanoparticles. The detection of Cu ?2 ion was based on changes in absorbance resulting from complex formation of the metal ion. Various concentrations of Cu ?2 ion were used to test the linearity and sensitivity of the method. A new peak at around 770 nm, in addition to the peak of the AgNP at 406 nm, was observed in each case (above 20 lM). With the increase of concentration of Cu ?2 ion solution, the absorbance at 406 nm peak decreased and that of 770 nm increased gradually. The calibration curve obtained from the ratio of the absorption coefficients of these two peaks (Ex 770/406 ) versus concentration of Cu ?2 ions enables one to estimate quantitatively the amount of Cu ?2 ions present in water in lM levels. This AgNP was further functionalized with 3-mercapto-1, 2-propanediol (MPD) for detection of Hg ?2 present in water by colorimetric method. As soon as Hg ?2 solution was added in MPDfunctionalized AgNP (MPD-AgNP), a new peak at around 606 nm appeared along with the peak at 404 nm. The new peak might be due to the aggregations occurred by the recognition of heavy metal ion Hg ?2 by MPD-AgNP through dipropionate ion. A calibration curve between the ratios of the absorption coefficients of these two peaks (Ex 404/606 ) and concentration of Hg ?2 was drawn for quantitative estimation of Hg ?2 present in water at lM level.

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Section: Optimization Of Synthesized Agnpmentioning

confidence: 99%

Detection of heavy metals (Cu+2, Hg+2) by biosynthesized silver nanoparticles

2015

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“…We have published on the equilibrium structure of the Cu,Zn complex and its subspecies in aqueous solution of various acidities recently [24]. In that paper the properties of the complex were investigated by pH potentiometric titration (determination of the complexes formed and their stability constants), UV-Visible and EPR spectroscopies (characterisation of the structure of the evolved complexes), mass spectrometry (determination of the molecular weight of the Cu,Zn complex).…”

Section: Characterisation Of the Catalysts Cuzn Complex And Its Immomentioning

confidence: 99%

“…The montmorilloniteimmobilised version of the Cu,Zn and Cu-tren complexes was also prepared and investigated. The properties of the non-supported Cu,Zn and Cu-tren complexes in aqueous solution have been studied by pH potentiometry, visible and EPR spectroscopy, mass spectrometry, cyclic voltammetry and published in one of our previous works [24]. The superoxide dismutase activities of these unsupported complexes have also been investigated [24].…”

Section: Introductionmentioning

confidence: 99%

“…The properties of the non-supported Cu,Zn and Cu-tren complexes in aqueous solution have been studied by pH potentiometry, visible and EPR spectroscopy, mass spectrometry, cyclic voltammetry and published in one of our previous works [24]. The superoxide dismutase activities of these unsupported complexes have also been investigated [24]. EPR and FT-IR spectroscopic characterisation and the investigation of thermal behaviour and superoxide dismutase activities of the silica-(immobilisation oc-curred via hydrogen bonds) and montmorillonite-supported Cu,Zn complex have been published as well [25].…”

Section: Introductionmentioning

confidence: 99%

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Mimicking catalase and catecholase enzymes by copper(II)-containing complexes

et al. 2006

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An imidazolate-bridged copper(II)-zinc(II) complex (Cu(II)-diethylenetriamino-µ-imidazolato-Zn(II)-tris (2-aminoethyl)amine perchlorate (denoted as "Cu,Zn complex") and a simple copper(II) complex (Cu(II)-tris(2-aminoethyl) amine chloride ( "Cu-tren") were prepared and immobilised on silica gel (by hydrogen or covalent bonds) and montmorillonite (by ion exchange). The immobilised substances were characterised by FT-IR spectroscopy and their thermal characteristics were also studied. The obtained materials were tested in two probe reactions: catalytic oxidation of 3,5-di-tert-butyl catechol (DTBC) (catecholase activity) and the decomposition of hydrogen peroxide (catalase activity). It was found that the catecholase activity of the Cu,Zn complex increased considerably upon immobilization on silica gel via hydrogen bonds and intercalation by ion exchange among the layers of montmorillonite. The imidazolate-bridged copper(II)-zinc(II) complex and its immobilised versions were inactive in hydrogen peroxide decomposition. The Cu(II)-tris(2-aminoethyl)amine chloride complex displayed good catalase activity; however, immobilisation could not improve it.

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“…In general porphyrin based mimics were the best catalysts, while nitroxides were weak SOD mimics [33]. Imidazolate-bridged Cu(II)-Zn(II) complex with three multidentate ligands showed higher SOD activity than the Cu(II) complex from which it was built up, although it was about two magnitude lower than the native Cu,ZnSOD enzyme [34]. The SOD activity of 1:1 and 1:2 Cu(II) complexes of curcumin were examined.…”

Section: Sod Mimicking Complexesmentioning

confidence: 99%

Redox-active bioinspired catalysts – syntheses, characterisation and an application

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Speciation study of an imidazolate-bridged copper(II)–zinc(II) complex in aqueous solution

Cited by 39 publications

References 47 publications

Detection of heavy metals (Cu+2, Hg+2) by biosynthesized silver nanoparticles

Detection of heavy metals (Cu+2, Hg+2) by biosynthesized silver nanoparticles

Mimicking catalase and catecholase enzymes by copper(II)-containing complexes

Redox-active bioinspired catalysts – syntheses, characterisation and an application

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