Synthesis, structures and fluorescence of nickel, zinc and cadmium complexes with the N,N,O-tridentate Schiff base N-2-pyridylmethylidene-2-hydroxy-phenylamine

Majumder, Arindam; Rosair, Georgina M.; Mallick, Arabinda; Chattopadhyay, Nitin; Mitra, Samiran

doi:10.1016/j.poly.2005.11.029

Cited by 359 publications

(143 citation statements)

References 60 publications

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“…In the title complex, the Zn(II) atom is coordinated by the pyridine N, imine N and amine N atoms of the Schiff base ligand and by two bromide anions, forming a distorted trigonal bipyramidal environment. The ZnN and ZnBr bond lengths are comparable to the values in other similar complexes [10][11][12]. The bond angles subtended at the Zn atom at the basal plane range from 112.35(9)°t o 131.66(9)°, and the bond angle of N1Zn1N3 at the axial positions deviates from the ideal value of 180°by 29.5(1)°, indicating a distorted trigonal bipyramid coordination.…”

Section: Discussionsupporting

confidence: 74%

Crystal structure of dibromo(N-ethyl-N'-pyridinylmethyleneethane-1,2- diamino)zinc(II), ZnBr2(C10H15N3)

Peng¹,

Ping²,

Song³

2007

Zeitschrift Für Kristallographie - New Crystal Structures

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Source of materialAll the chemicals used were of AR grade. N-ethyl-1,2-diaminoethane (8.8 mg, 0.1 mmol) and pyridine-2-carbaldehyde (10.8 mg, 0.1 mmol) were refluxed in 10 ml methanol for 30 min. To the above solution was added ZnBr 2 (23.0 mg, 0.1 mmol) in 10 ml methanol. The mixture was refluxed for 1 h. The mixture was filtered after cooling to room temperature. After keeping the filtrate in air for 10 d, colorless crystals were formed. DiscussionZinc is the second most abundant transition or post-transition metal in biology. It functions as the active site of hydrolytic enzymes, such as carboxypeptidase and carbonic anhydrase, where it is in a hard-donor coordination environment of nitrogen and oxygen [1]. It also has long been recognized as an important cofactor in biological molecules, either as a structural template in protein folding or as a Lewis acid catalyst that can readily adopt four-, fiveor six-fold coordination [2-6]. Recent reports have suggested that zinc is able to play a catalytic role in the activation of thiols as nucleophiles at physiological pH [7,8]. We have reported the structure of a mononuclear Schiff base zinc(II) complex [9] and synthesized a further Schiff base zinc(II) complex and determined its crystal structure.In the title complex, the Zn(II) atom is coordinated by the pyridine N, imine N and amine N atoms of the Schiff base ligand and by two bromide anions, forming a distorted trigonal bipyramidal environment. The ZnN and ZnBr bond lengths are comparable to the values in other similar complexes [10][11][12]. The bond angles subtended at the Zn atom at the basal plane range from 112.35(9)°t o 131.66(9)°, and the bond angle of N1Zn1N3 at the axial positions deviates from the ideal value of 180°by 29.5(1)°, indicating a distorted trigonal bipyramid coordination. The deviation of ÐN1Zn1N3 is result from the steric effects of the five-membered chelate rings Zn1/N1/C2/C1/N2 and Zn1/N2/C7/C8/N3. Atom N8 deviates from the plane defined by Zn1/N2/C7/N3 by 0.644(6) Å.

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Section: Discussionsupporting

confidence: 74%

Crystal structure of dibromo(N-ethyl-N'-pyridinylmethyleneethane-1,2- diamino)zinc(II), ZnBr2(C10H15N3)

Peng¹,

Ping²,

Song³

2007

Zeitschrift Für Kristallographie - New Crystal Structures

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“…In the spectra of complex 5a, bands at 1099 and 622 cm À1 were assigned to non-coordinated perchlorates counter anions [45][46][47] and the presence of these ions was confirmed by elemental analysis and molar conductivity results. In contrast to the other complexes isolated, 5a exhibited a sharp band at 3424 cm À1 which was attributed to the phenolic hydroxyl group.…”

Section: Ir Spectra Of Copper(ii) Complexes (2a-14a)mentioning

confidence: 75%

“…In contrast to the other complexes isolated, 5a exhibited a sharp band at 3424 cm À1 which was attributed to the phenolic hydroxyl group. Therefore, it was concluded that in complex 5a, the mode of coordination of metal ion to the ligand was via the nitrogen of azomethine and the oxygen atom of the phenolic groups, a coordination mode noted in similar Schiff base complexes of Ni(II), isolated by Majumder et al [47].…”

Section: Ir Spectra Of Copper(ii) Complexes (2a-14a)mentioning

confidence: 81%

Anticancer and antifungal activity of copper(II) complexes of quinolin-2(1H)-one-derived Schiff bases

Creaven

Duff

Egan

et al. 2010

Inorganica Chimica Acta

207

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a b s t r a c tThe condensation of substituted aromatic aldehydes with 7-amino-4-methyl-quinolin-2(1H)-one (1) has lead to the isolation of quinolin-2(1H)-one derived Schiff bases (2-14). The copper(II) complexes (2a-14a) of the ligands were also prepared, and together with their corresponding free ligands were fully characterised by elemental analyses, spectral methods (IR, 1 H and 13 C NMR, AAS, UV-Vis), magnetic and conductance measurements. The bidentate ligands coordinated to the copper(II) ion through the deprotonated phenolic oxygen and the azomethine nitrogen of the ligands in almost all cases. X-ray crystal structures of two of the complexes, 5a and 8a, confirmed the bidentate coordination mode. All of the compounds were investigated for their antimicrobial activities against the fungus, Candida albicans, and against Gram-positive and Gram-negative bacteria. The compounds were found to have excellent antiCandida activity but were inactive against Staphylococcus aureus and Escherichia coli. Selected compounds (2-8 and 2a-8a) were also screened for their in vitro anticancer potential using the human hepatic carcinoma cell line, Hep-G 2 . Several derivatives were shown to be active comparable to that of cisplatin.

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“…Significant difference in the position of maximum emission of Schiff base and each metal(II) complexes which is due to the coordination of the metal(II) ion to the ligand. Quenching of fluorescence through complexation is much interesting as it opens up the opportunity for photochemical applications of these complexes [23][24][25].…”

Section: Fluorescence Spectral Studiesmentioning

confidence: 99%

Synthesis, physicochemical, thermal, fluorescence and catalytic activity studies of novel Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate (ONS) Schiff base ligand

et al. 2017

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Syntheses and physicochemical studies of Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate Schiff base ligand (E)-2-((1-(thiophen-2-yl)ethylidene)amino)phenol (HL) (ATS) were characterized by elemental analysis, FT-IR, Mass, 1 H NMR, UV-Vis, magnetic moment, thermal analysis (TG and DTG) techniques, molar conductance and fluorescence spectra. The IR spectra showed that complexes were coordinated in metal ions via the imine N, O and S atoms. Magnetic and UV-Vis spectra, indicated that the geometrical structure of Mn(II), Co(II) and Ni(II) complexes are an octahedral while Cu(II) is a tetrahedral. The kinetic thermodynamic parameters such as E*, H*, S* and G* were determined for each thermal degradation stage of TG curves of the metal(II) complexes using Coat-Redfern method. Fluorescence studies indicated that the Schiff base ligand HL (ATS), and its metal(II) complexes can serve as potential photoactive materials as indicated from their characteristic fluorescence properties and study the effect of solvent and pH on it. The catalytic activities of metal(II) complexes were studied using H2O2 solution. KEYWORDSONS donor sites Catalytic activity Thermal analysis Schiff base ligand Metals complexes Fluorescence spectra 2-((1-(Thiophen-2-yl)ethylidene)amino)phenol Cite this: Eur.

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Synthesis, structures and fluorescence of nickel, zinc and cadmium complexes with the N,N,O-tridentate Schiff base N-2-pyridylmethylidene-2-hydroxy-phenylamine

Cited by 359 publications

References 60 publications

Crystal structure of dibromo(N-ethyl-N'-pyridinylmethyleneethane-1,2- diamino)zinc(II), ZnBr2(C10H15N3)

Crystal structure of dibromo(N-ethyl-N'-pyridinylmethyleneethane-1,2- diamino)zinc(II), ZnBr2(C10H15N3)

Anticancer and antifungal activity of copper(II) complexes of quinolin-2(1H)-one-derived Schiff bases

Synthesis, physicochemical, thermal, fluorescence and catalytic activity studies of novel Mn(II), Co(II), Ni(II) and Cu(II) complexes with tridentate (ONS) Schiff base ligand

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