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Journal articles on the topic 'Cu (II) Chelates'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

Krishnankutty, K., Basheer Ummathur, and Perumpalli Ummer. "1-naphthylazo derivatives of some 1,3-dicarbonyl compounds and their Cu (II), Ni(II) and Zn(II) complexes." Journal of the Serbian Chemical Society 74, no. 11 (2009): 1273–82. http://dx.doi.org/10.2298/jsc0911273k.

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The coupling of diazotized 1-aminonaphthalene with 1,3-dicarbonyl compounds (acetylacetone, methylacetoacetate and acetoacetanilide) yielded a new series of bidentate ligand systems (HL). Analytical, IR, 1H-NMR and mass spectral data indicate that the compounds exist in the intramolecularly hydrogen bonded keto-hydrazone form. With Ni(II), Cu(II) and Zn(II), these potential monobasic bidentate ligands formed [ML2] type complexes. The IR, 1H- -NMR and mass spectral data of the complexes are consistent with the replacement of the chelated hydrazone proton of the ligand by a metal ion, thus leadi

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2

Alshater, Heba, Ahlam I. Al-Sulami, Samar A. Aly, Ehab M. Abdalla, Mohamed A. Sakr, and Safaa S. Hassan. "Antitumor and Antibacterial Activity of Ni(II), Cu(II), Ag(I), and Hg(II) Complexes with Ligand Derived from Thiosemicarbazones: Characterization and Theoretical Studies." Molecules 28, no. 6 (2023): 2590. http://dx.doi.org/10.3390/molecules28062590.

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Four new complexes (Ni2+, Cu2+, Ag+, and Hg2+) were prepared from the ligand N-(4-chlorophenyl)-2-(phenylglycyl)hydrazine-1-carbothioamide (H2L). Analytical and spectroscopic techniques were used to clarify the structural composition of the new chelates. In addition, all chelates were tested against bacterial strains and the HepG2 cell line to determine their antiseptic and carcinogenic properties. The Ni(II) complex was preferable to the other chelates. Molecular optimization revealed that H2L had the highest reactivity, followed by Hg-chelate, Ag-chelate, Ni-chelate, and Cu-chelate. Moreover

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3

Wu, Hong Wei, Wan Cui Xie, Xi Hong Yang, Fu Rao Lai, Hui Wu, and Dong Wei Cheng. "Influence of Chelation Rate on the Oligochitosan Preparation by Enzymolysis of CTS-Cu (II)." Advanced Materials Research 962-965 (June 2014): 1252–57. http://dx.doi.org/10.4028/www.scientific.net/amr.962-965.1252.

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To prepare a homogenous low-molecular-weight chitosan oligosaccharide with high solubility and physiological activity, the CTS-Cu (II) chelate was degraded by cellulose, xylanase, semi-cellulase, pectinase, lipase. Cellulose was used to investigate the enzymolysis of the CTS-Cu (II) chelates at various chelation rates. The oligochitosan yields were determined by ultrafiltration and spectrophotometry. The molecular weight distributions of the degradation products were compared by gel column chromatography. Results showed that the generation of the CTS-Cu (II) chelate promoted chitosan degradati

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4

Krishnankutty, Krishnannair, Basheer Ummathur та Kamalakshy Babu. "Benzothiazolylazo derivatives of some β-dicarbonyl compounds and their Cu(II), Ni(II) and Zn(II) complexes". Journal of the Serbian Chemical Society 75, № 5 (2010): 639–48. http://dx.doi.org/10.2298/jsc090816040k.

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The coupling of diazotized 2-aminobenzothiazole with 1,3- dicarbonyl compounds (benzoylacetone, methylacetoacetate and acetoacetanilide) yielded a new series of tridentate ligand systems (HL). Analytical, IR, 1H-NMR, 13C-NMR and mass spectral data indicated that the compounds exist in the intramolecularly hydrogen bonded azo-enol tautomeric form in which one of the carbonyl groups of the dicarbonyl moiety had enolised and hydrogen bonded to one of the azo nitrogen atoms. The compounds formed stable complexes with Ni(II), Cu(II) and Zn(II) ions. The Cu(II) complexes conform to [CuL(OAc)] stoich

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5

V., Sadasivan, and Alaudeen M. "A study on the aryla,. zo coupling reaction of bis-(acetylacetone)ethylenediaminocopper(II) and bis(acetylacetone)ethylenediaminonickei(II)." Journal of Indian Chemical Society Vol. 83, Nov 2006 (2006): 1145–48. https://doi.org/10.5281/zenodo.5832495.

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Department of Chemistry, University College, Thiruvananthapuram-695 034, Kerala, India <em>E-mail </em>: drthanal@rediffmail.com <em>Manuscript received 8 May 2006, revised 17 August 2006, accepted 23 August 2006</em> The electrophilic substitution of aryl diazonium ion on the cu<sup>ll</sup> and Ni<sup>ll</sup> chelates of bisacetylacetone) ethylenediamine [H<sub>4</sub>enacac] in aqueous medium have been studied. The coupling products were isolated and characterized by elemental analysis,magnetic susceptibility measurement and electronic, infrared,<sup>1</sup>H NMR, ESR and mass spectral stu

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6

El-Tabl, Abduo S., S. El-Kousy, M. A. Wahba, and S. M. Khalefa. "Organic Amino Acids Chelates; Preparation, Spectroscopic Characterization and Applications as Foliar Fertilizers." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 2 (2014): 2203–17. http://dx.doi.org/10.24297/jac.v10i2.980.

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Cu(II) complexes of amino acid hydrolyzate soya protein isolate have been prepared. In order to study the mode of coordination in the above chelates and their effect as foliar fertilizer, Mn(II), Co(II), Nil(II), Cu(II), Zn(II) and Cd(II) complexes of L-mino acids have been prepared and characterized by elemental and spectral analyses,( IR, UV-VIS, mass spectra and ESR), electrical conductance, magnetic moments and thermal analyses (DTA and TGA). ESR spectra of copper (II) complexes show isotropic and anisotropic types d(x2-y2) with covalent bond character. The amino acids chelates were evalua

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7

Pérez-González, Adriana, Mario Prejanò, Nino Russo, Tiziana Marino, and Annia Galano. "Capsaicin, a Powerful •OH-Inactivating Ligand." Antioxidants 9, no. 12 (2020): 1247. http://dx.doi.org/10.3390/antiox9121247.

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Oxidative conditions are frequently enhanced by the presence of redox metal ions. In this study, the role of capsaicin (8-methyl-N-vanillyl-6-nonenamide, CAP) in copper-induced oxidative stress was investigated using density functional theory simulations. It was found that CAP has the capability to chelate Cu(II), leading to complexes that are harder to reduce than free Cu(II). CAP fully turns off the Cu(II) reduction by Asc−, and slows down the reduction in this cation by O2•−. Therefore, CAP is proposed as an •OH-inactivating ligand by impeding the reduction in metal ions (OIL-1), hindering

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8

Ibrahim, Said A., Sahar A. El-Gyar, and Mohamed A. El-Gahami. "Metal complexes of nitrogen-oxygen donor ligands as potential drugs." Collection of Czechoslovak Chemical Communications 56, no. 6 (1991): 1333–39. http://dx.doi.org/10.1135/cccc19911333.

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Twelve new complexes of Cu(II), Ni(II), Co(II) and Cd(II) with 5-phenyl, 5-p-tolyl and 5-aminothioacetimide-azo-8-hydroxyquinoline have been synthesized. The ligands act as bidentate (NO) chelating agents forming the bis-chelate complexes. Analytical, conductivity, spectral and thermal data are consistent with six coordinated structure in the case of Cu(II), Ni(II), Co(II) and four coordinate structure in the case of the analogues Cd(II). It is identified that the metal chelates possess enhanced antibacterial and antifungal activities relative to the free ligands.

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9

J., K. VERMA, and S. P. VERMA G. "Potentiometric and Structural Studies on Chromium(II), Manganese(II), lron(II), Cobalt(II), Nickel(II), Copper(II), Zinc(Il) and Cadmium(Il) Complexes with Butan-3- semicarbazone-1-carboxylic Acid." Journal of Indian Chemical Society Vol. 63, May 1996 (1986): 469–71. https://doi.org/10.5281/zenodo.6277453.

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Government College, Daman-396 210 Ranchi University, Ranchi-834 008 <em>Manuscript received 28 August 1984, revised 24 February 1986, accepted 31 March 1986</em> The potentiometric studies on Cr<em><sup>II</sup></em>,Mn<em><sup>II</sup></em>,Fe<em><sup>II</sup></em>,Co<em><sup>II</sup></em>,Ni<em><sup>II</sup></em>,Cu<em><sup>II</sup></em>,Zn<em><sup>II</sup></em>, and Cd<em><sup>II</sup></em> chelates with butan-3-semicarbazone-1-carboxylic acid werecarried out according to Calvin-Bjerrum technique in 75% <em>(viv) </em>dioxane-water medium at 25, 35 and 45°(<em>µ-</em>0.1<em>M

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10

Fouegue Tamafo, Aymard Didier, Julius Numbonui Ghogomu, Nyiang Kennet Nkungli, Désiré Bikélé Mama, and Elie Younang. "Quantum Chemical Investigation on the Antioxidant Activity of Neutral and Anionic Forms of Juglone: Metal Chelation and Its Effect on Radical Scavenging Activity." Journal of Chemistry 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/3281684.

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The chelation ability of divalent Mg, Ca, Fe, Co, Ni, Cu, Zn, and monovalent Cu ions by neutral and anionic forms of juglone has been investigated at DFT/B3LYP/6-31+G(d,p) level of theory in gas and aqueous phases. It is noteworthy that only the 1 : 1 stoichiometry was considered herein. The effects of these metals on the radical scavenging activity of neutral juglone were evaluated via the usual descriptors of hydrogen atom transfer. According to our results, metal chelation by the two forms of juglone was spontaneous and exothermic in both media. Based on the binding energies, Cu(II) ion sho

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11

Chohan, Zahid H. "Ni (II), Cu (II) and Zn (II) Metal Chelates With Some Thiazole Derived Schiff-Bases: Their Synthesis, Characterization and Bactericidal Properties." Metal-Based Drugs 6, no. 2 (1999): 75–80. http://dx.doi.org/10.1155/mbd.1999.75.

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A number of thiazole derived tridentate Schiff-bases (LH) and its metal chelates of the type [M(L)2X] where M=Ni(II), Cu(II) and Zn(II), L=substituted salicylaldehyde (5-H, 5-CH3, 5-OCH3, 5-NO2 and 5-Cl) and X=CI have been synthesized and characterized with the help of elemental analyses, conductivity measurements, magnetic moments, UV-Vis, IR and NMR spectral data. An octahedral structure for Ni(II) and Zn(II) and a distorted octahedral structure for Cu(II) chelates have been proposed. All the Schiff-bases and their metal chelates have been screened for their biological activity against Esche

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12

Perez-Toro, M. Inmaculada, Alicia Dominguez-Martin, Duane Choquesillo-Lazarte, et al. "Lights and shadows in the challenge of binding acyclovir, a synthetic purine-like nucleoside with antiviral activity, at an apical–distal coordination site in copper(II)-polyamine chelates." Journal of Inorganic Biochemistry 148 (July 1, 2015): 84–92. https://doi.org/10.1016/j.jinorgbio.2015.03.006.

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Several nucleic acid components and their metal complexes are known to be involved in crucial metabolic steps. Therefore the study of metal–nucleic acid interactions becomes essential to understand these biological processes. In this work, the synthetic purine-like nucleoside acyclovir (acv) has been used as a model of guanosine recognition with copper(II)-polyamine chelates. The chemical stability of the N9-acyclic arm in acv offers the possibility to use this antiviral drug to deepen the knowledge of metal–nucleoside interactions. Cu(II) chelates with cyclam, cyclen and trien wer

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13

Vashi, R. T., C. D. Shelat, and Himanshu Patel. "Synthesis, Spectroscopic Studies and Antifungal Activity of 2-[(4(3-Chlorophenyl) piperazine-1-yl)methyl]-3-[8-hydroxy quinolin-5-yl]-3(H)-quinazolin-4-one Ligand and its Chelates." E-Journal of Chemistry 7, s1 (2010): S163—S168. http://dx.doi.org/10.1155/2010/701409.

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The novel ligand HL6was synthesized using anthranilic acid and it was undergo the chelating reaction with Cu(II), Ni(II), Co(II), Mn(II) and Zn(II) to prepare transition metal chelates. These chelates were characterized by physicochemical methods such as elemental analysis, conductometric studies, magnetic susceptibility, FT-IR, NMR and electronic spectra. The stoichiometry of the complexes has been found to be 1: 2 (Metal: ligand). An octahedral geometry around Co(II), Ni(II) and Mn(II), distorted octahedral geometry around Cu(II) and tetrahedral geometry around Zn(II) have been proposed. The

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14

Emama, Sanaa M., Saeyda A. AbouEl-Enein, Sanaa A. Othman, and Eman M. El-Mahdey. "Novel metal chelates with thiourea and nicotinic acid: Synthesis, structural characterization, and biological properties." Current Chemistry Letters 12, no. 2 (2023): 317–34. http://dx.doi.org/10.5267/j.ccl.2022.12.007.

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The interaction of nicotinic acid and thiourea with the chloride salts of Ca(II), Mg(II), Co(II), Ni(II), Cu(II), and Fe(III) ions led to the synthesis of a unique series of metal chelates. All formed metal complexes were clarified using a variety of analytical and spectral techniques, besides magnetic moment and thermal tests. The electronic and magnetic measurements indicated that the paramagnetic chelates (3) and (4), as well as the diamagnetic complexes (1) and (2), were responsible for the tetrahedral geometrical structure. The outcomes also led to the production of square-planar, and hig

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15

M. El-Megharbel, Samy, Safa H. Qahl, Khaled Althobaiti, Eman H. Al-Thubaiti, and Reham Z. Hamza. "Antioxidant novel activities of curcumin complexes with Mg(II), Ca(II), Cu(II), Cr(III) and Se(IV) metal ions: synthesis and spectral studies." Bulletin of the Chemical Society of Ethiopia 38, no. 2 (2024): 347–63. http://dx.doi.org/10.4314/bcse.v38i2.6.

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Curcumin (Cur) metal complexes of Mg(II), Ca(II), Cu(II), Cr(III), and Se(IV) were prepared and characterized using elemental analysis, molar conductance, IR, UV-spectra, 1H NMR, SEM, TEM, and X-ray diffraction. The very low values of molar conductance confirm that Cl- ions are absent inside or outside the chelation sphere confirming their non-electrolytic nature, while for Cr(III) Cur is high compared to other curcumin complexes, confirming that Cl- ions are inside the complexation sphere. Based on IR and electronic spectra, the Cur C=O group in enol form chelated to Mg(II), Ca(II), Cu(II), C

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16

Oktavec, Drahomír, Jozef Lehotay, Viktor Vrábel, and Elena Korgová. "Extraction of Dithiocarbamate Chelates of Ni(II), Cu(II), Zn(II)." Collection of Czechoslovak Chemical Communications 61, no. 5 (1996): 673–80. http://dx.doi.org/10.1135/cccc19960673.

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Extraction has been investigated of chelates of alkali salts of dithiocarbamic (DTC) acids derived from (R-) dimethyl-, diethyl-, dipropyl-, diisopropyl-, dibutyl-, diisobutyl-, dipentyl-, and dihexylamine, piperidine, and morpholine with Ni(II), Cu(II), and Zn(II) from aqueous solutions of various pH values into chloroform for various time intervals. The optimum conditions have been determined for the maximum extraction yields of the metal connected with the minimum extraction yields of excess DTC ligand. The extraction of DTC chelates of Ni(II), Cu(II), and Zn(II) is best accomplished in a r

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17

P., Venugopalan, and Krishnankutty K. "Metal chelates of 6-aryl-5-hexene-2,4-diones." Journal of Indian Chemical Society Vol. 78, Sep 2001 (2001): 472–73. https://doi.org/10.5281/zenodo.5883838.

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Department of Chemistry, University of Calicut, Kerala-673 635, India <em>Manuscript received 17 November 2000, revised 12 March 2001, accepted 24 March 2001</em> A series of 6-aryl-5-hexene-2,4-diones and their Ni<sup>II</sup>, Cu<sup>II</sup>, Zn<sup>II</sup> and Pd<sup>II</sup> chelates of composition ML<sub>2 </sub>have been synthesised. The metal ion replaces the enol proton of the ligands with the formation of a stable six-membered metal chelate ring involving the dicarbonyl function.

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18

Joice, M. Vimala, and P. Metilda Metilda. "Investigation of Metal(II)-Curcumin-Glycine Complexes : Preparation, Structural Characterization and Biological Activities." Oriental Journal Of Chemistry 37, no. 2 (2021): 397–404. http://dx.doi.org/10.13005/ojc/370219.

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A novel Schiff base obtained from curcumin and glycine was prepared and it was reacted with Co, Ni, Cu and Zn metals in order to form the stable metal complexes and characterized by elemental analysis, magnetic, molar conductance, IR, UV-Vis.,1H NMR and PXRD. The data shows that the complexes have the structure [M(II)-(cur-gly)H2O] system Electronic and magnetic data suggest a tetrahedral geometry for Co, Ni and Zn except Cu complex has a square planar geometry. The antimicrobial activity of cur-gly and its metal chelates were confirmed against the bacterial species as E. coli, P. aeruginosa,

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19

O. Sobola, A., G. M. Watkins, R. O. Shaibu, S. Adewuyi, and S. A. Amolegbe. "Synthesis, characterization and antimicrobial activity of copper(II) Schiff base adducts of some p-substituted aniline Schiff bases." Bulletin of the Chemical Society of Ethiopia 35, no. 1 (2021): 33–42. http://dx.doi.org/10.4314/bcse.v35i1.3.

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The synthesis, characterization and antimicrobial activity of Cu(II) complexes of some p-substituted aniline Schiff base ligands have been carried out. The Schiff bases were obtained from salicylaldehyde and o-vanillin. The Cu(II) complexes have been characterized by elemental analysis, conductivity measurement, infrared and electronic spectral data. The complexes were obtained either as metal chelates [Cu(L)2] or Schiff base adducts (CuCl2.2LH).xH2O. The metal chelates were non-electrolytes while the Schiff base adducts exhibited 1:1 or 2:1 electrolytes in methanol. The Cu(II) complexes exhib

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20

Mir, M. Amin, and Mohammad Waqar Ashraf. "TG, DTA Pyrolytic Analysis of Cobalt, Nickel, Copper, Zinc, and 5,8-Dihydroxy-1,4-Naphthoquinone Chelate Complexes." Journal of Chemistry 2021 (May 4, 2021): 1–13. http://dx.doi.org/10.1155/2021/6691137.

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The solid state reactions identified on the TG traces with correspondence to DTG peaks consequent to the nonisothermal decomposition of polymetallic chelates of the naphthazarin with Zn (II), Co (II), Ni (II), and Cu (II) over the temperature range ambient at 800°C have been studied kinetically following the Dave and Chopra method as these solid state reactions exhibited their resemblance with the Freeman recommended reaction for kinetic studies. The solid state reactions as described followed first order kinetics. The kinetic data showed the very low value of Z for each of the solid state rea

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21

Chandan, Kumar. "Synthesis, characterization and biological evaluations of heterobinuclear complexes of CuII and NiII Schiff base of ethylenediamine and o-hydroxyacetophenone with alkali metal salts of o-nitrophenol." Journal of Indian Chemical Society Vol. 94, Aug 2017 (2017): 857–61. https://doi.org/10.5281/zenodo.5595126.

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Department of Chemistry, S. P. College, S. K. M. University, Dumka-814 101, Jharkhand, India <em>E-mail</em> : chandankumar78@yahoo.com <em>Manuscript received 12 November 2016, revised 29 April 2017, accepted 15 May 2017</em> Novel heterobinuclear alkali metal complexes have been synthesized by the interaction of stable Cu<sup>II</sup> and Ni<sup>II</sup> metal chelate of ethylenediamine and <em>o</em>-hydroxyacetophenone with alkali metal salts. The structures of these complexes have been discussed on the basis of elemental analysis, IR and UV-Vis spectral data and magnetic measurement. The

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22

Terhemba, S. Iningev, and J. Gbertyo Aondoaver. "Chelation Effect of 2,4-Pentadione with Ni(II) and Cu(II) Ions." Chemistry Research Journal 6, no. 2 (2021): 48–57. https://doi.org/10.5281/zenodo.11621609.

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<strong>Abstract </strong>Synthesis of inorganic compounds with medical application is the aspect this work set to contribute. Ni(II) and Cu(II) chelates of2,4-pentadione (acetylacetone) were obtained from the reaction of hydrated divalent metal chloride salts with acetylacetone in aqueous ammonical medium. The complexes were prepared in order to examine the effect of chelation of 2,4-pentadione with metal ions, and antimicrobial activity on some pathogens. The compounds were characterised by infrared spectrophotometry. The absorption bands of the carbonyl group after coordination with Ni(II)

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23

Spînu, C., M. Pleniceanu, and C. Tigae. "Biologically active new Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes of N-(2-thienylmethylene)methanamine." Journal of the Serbian Chemical Society 73, no. 4 (2008): 415–21. http://dx.doi.org/10.2298/jsc0804415s.

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Iron(II), cobalt(II), nickel (II), copper (II), zinc(II) and cadmium(II) complexes of the type ML2Cl2, where M is a metal and L is the Schiff base N- -(2-thienylmethylene)methanamine (TNAM) formed by the condensation of 2- -thiophenecarboxaldehyde and methylamine, were prepared and characterized by elemental analysis as well as magnetic and spectroscopic measurements. The elemental analyses suggest the stoichiometry to be 1:2 (metal:ligand). Magnetic susceptibility data coupled with electronic, ESR and M?ssbauer spectra suggest a distorted octahedral structure for the Fe(II), Co(II) and Ni(II)

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24

Bach, A., L. Beyer, T. Gelbrich, et al. "Metallkomplexe von N-(Pyrrol-l-yl)salicylaldiminen und deren Strukturbestimmung mittels Röntgendiffraktometrie und Röntgenabsorptionsspektroskopie (XANES) / Metal Chelates of N -(Pyrrol-l-yl)salicylaldim ines and their Structure D eterm ination by X-Ray Structure Analysis and X -R ay Absorption Spectroscopy (XANES)." Zeitschrift für Naturforschung B 51, no. 6 (1996): 757–64. http://dx.doi.org/10.1515/znb-1996-0601.

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Abstract A series of three N-(pyrrol-l-yl)salicylaldim ines 1-3 has been prepared an d characterized. Their metal chelate complexes with Cu, Ni and Co are described. The molecular structures of bis[N-(pyrrol-l-yl)salicylaldim inato]copper(lI) la, bis{N-[3-(pyrrol-l-yl)propyl]- salicylaldiminato}nickel(II) 2b and tris{N-[3-(pyrrol-l-yl)propyl]salicylaldiminato}cobalt(III) 2d were determined by X-ray structure analysis. The chelates with tetracoordinated copper and nickel show a square planar coordination with the characteristic trans configuration. The chelate with hexacoordinated cobalt has a

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25

El-Ghamry, Hoda A., Mohamed Gaber, Fatmah M. Alkhatib, Hossa F. Al Shareef, Khadiga M. Takroni, and Shaimaa K. Fathalla. "Insight into the synthesis, structure affirmation and catalytic efficiency of divalent and trivalent metal chelates of mandelic acid hydrazone derivative." RSC Advances 14, no. 42 (2024): 30673–86. http://dx.doi.org/10.1039/d4ra05769d.

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Cr(iii), Mn(ii), Co(ii), Ni(ii) and Cu(ii) chelates of the hydrazone ligand have been synthesized and their structure have been confirmed. Phenoxazinone synthase like efficacy afforded high activity for Mn(ii) complex with TOF number of 169.89 h−1.

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26

Chohan, Zahid H., and S. K. A. Sherazi. "Synthesis, Characterization and Role of Anions (Nitrate, Sulphate, Oxalate and Acetate) \in the Biological Activity of Hydrazine Derived Compounds and Their Metal Chelates." Metal-Based Drugs 4, no. 6 (1997): 327–32. http://dx.doi.org/10.1155/mbd.1997.327.

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Hydrazine derived compounds and its Co(II), Cu(II) and Ni(II) chelates having the same metal ion but different anions (e.g., nitrate, sulphate, oxalate and acetate) have been synthesised and characterised by their physical, spectral and analytical data. In order to evaluate the participating role of anions in the antibacterial activity, these synthesised ligands and its metal chelates have been screened against bacterial species such as Staphylococcus aureous, pseudomonas aeruginosa, Klebsiella pneumonae and Proteus vulgarus, and the results are reported.

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27

Sudhakar, P., K. Rajasekar, S. Balasubramaniyan, R. Selvarani, C. Veeravel, and S. Narasimhavarman. "Microwave-Assisted Synthesis, Spectral and Biopotential Characterization of Cr(III), Cu(II) and Zn(II) Complexes with 4-Aminothiophenol and Benzoate Ion." Asian Journal of Chemistry 34, no. 9 (2022): 2235–40. http://dx.doi.org/10.14233/ajchem.2022.23800.

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Bioactive metal complexes of Cr(III), Cu(II), and Zn(II) were synthesized with 4-aminothiophenol and benzoate ion under microwave irradiation. The synthesized metal chelates were characterized by physical, spectral, biological studies. The geometry and magnetism of all the complexes were monitored by electronic spectra and magnetic studies. The metal complexes possess the metal-ligand ratios is in the order of 1:3:3 metal:ligand1:ligand2 for Cr(III), 1:2:2 metal: ligand1:ligand2 for Cu(II) and Zn(II) complexes were predicted based on the elemental analysis and metal estimation. The synthesized

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28

B., ANANDAM, and LINGAIAH P. "A Study on Metal Chelates of Substituted Hydroxyphenylpyrazoles with some Bivalent Transition Metal Ions." Journal of Indian Chemical Society Vol. 70, Jan 1993 (1993): 8–10. https://doi.org/10.5281/zenodo.5902578.

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Department of Chemistry, C. K. M. Arts and Science College, Warangal-506 009 Department of Chemistry, Kakaliya University, Warangal-506 009 <em>Manuscript received 2 September 1991, revised 1 September 1992, accepted 17 September 1992</em> The stability constants of metal chelate & of substituted hydroxyphenylpyrazoles, viz. 3(5)-(2· hydroxyphenyl)· -(3)-phenylpyrazole (OHPPPz), 3(5)<em>·</em>(2·hydroxyphenl)-5(3)-(4·chlororphenl) pyrazole (OHPCPPz) and 3·(2-bydroxyphenyl)-1 ,5-diphenylpyrazole (OHPDPPz) with Co<sup>II</sup> Ni<sup>II</sup>. C

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29

Saha, Sanjoy, Dhiraj Brahman, and Biswajit Sinha. "Cu(II) complexes of an ionic liquid-based Schiff base [1-{2-(2-hydroxy benzylidene amino) ethyl}-3-methylimidazolium]Pf6: Synthesis, characterization and biological activities." Journal of the Serbian Chemical Society 80, no. 1 (2015): 35–43. http://dx.doi.org/10.2298/jsc140201078s.

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Two Cu(II) complexes of an ionic liquid based Schiff base 1-{2-(2-hydroxybenzylideneamino) ethyl}-3-methylimidazolium hexaflurophosphate, were prepared and characterized by different analytical and spectroscopic methods such as elemental analysis, magnetic susceptibility, UV-Vis, IR, NMR and mass spectroscopy. The Schiff base ligand was found to act as a potential bidentate chelating ligand with N, O donor sites and formed 1:2 metal chelates with Cu(II) salts. The synthesized Cu(II) complexes were tested for biological activity.

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30

Yousaf, Mariyam, Muhammad Imran, Zunaira Zulfiqar, et al. "Stabilization of Sunflower Oil Using Corn Silk Extract and Its Metal Chelates." Romanian Agricultural Research 36 (2019): 221–29. http://dx.doi.org/10.59665/rar3625.

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Antioxidants are wisely employed in various food products, physiology and pathology for controlling different oxidative routes. Natural antioxidants should replace synthetic ones since they are destructive for human’s health. In this regard, corn silk extract (CSEE) was obtained and subsequently screened for antioxidant potential by different assays (DPPH, β-carotene, FRAP, ABTS, total phenol CSE and flavonoids content). Cu(II) and Zn(II) chelates of this extract were also prepared to compare their antioxidant potential with uncomplexed extract. Stabilization of sunflower oil by CSEE and its r

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31

El-Ghamry, Hoda A., Rajaa O. Al-Ziyadi, Fatmah M. Alkhatib, Khadiga M. Takroni, and Abdalla M. Khedr. "Metal Chelates of Sulfafurazole Azo Dye Derivative: Synthesis, Structure Affirmation, Antimicrobial, Antitumor, DNA Binding, and Molecular Docking Simulation." Bioinorganic Chemistry and Applications 2023 (April 22, 2023): 1–20. http://dx.doi.org/10.1155/2023/2239976.

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A series of divalent and one trivalent metal chelates of the azo ligand resulting from coupling of sulfafurazole diazonium chloride with resorcinol have been designed and synthesized. Structure investigation of the isolated chelates have been achieved by applying spectroscopic and analytical tools which collaborated to assure the formation of the metal chelates in the molar ratios of 1L: 1M for Ni(II), Co(II), and Fe(III) chelates, where Cu(II) and Zn(II) complexes formed in the ratio 2L : 1M. The geometrical arrangement around the metal canters was concluded from UV-Vis spectra to be octahedr

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32

Ibrahim, S. A., M. A. El-Gahami, R. M. Mahfouz, and K. A. Farghali. "Preparation, Spectral Properties and Biological Activity of Cu(II), Zn(II) and Cd(II) Chelates of 8-Hydroxyquinoline-5-sulfonamides." Zeitschrift für Naturforschung B 44, no. 12 (1989): 1488–92. http://dx.doi.org/10.1515/znb-1989-1203.

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The complexes of some quinolinol sulfonamides with Cu(II), Zn(II), and Cd(II) have been synthesized and formulated as [Cu(L)2(H2O)2] and [M(L)2]nH2O, M = Zn(II), or Cd(II), n = 0—3 and L = anion of the corresponding ligand. Their structures have been suggested by elemental analysis, electronic and IR spectroscopy, and conductivity measurements. It was found that the sulfonamide ligands are monobasic bidentate ON donors of the quinolinol group. Consequently, the Zn(II) and Cd(II) complexes are formulated as tetrahedral, whereas in Cu(II) complexes a distorted octahedral environment of the metal

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33

Torabi, S. Ali Asghar, Fahimeh Jamali, George A. Koutsantonis, Ali Morsali, Brian W. Skelton, and Allan H. White. "4,4′-Bithiazoles as Ligands: Crystal and Molecular Structure of bis(O,O′-Nitrato)(2,2′-diphenyl-4,4′-bithiazole)copper(II) (Two Polymorphs)." Australian Journal of Chemistry 56, no. 9 (2003): 949. http://dx.doi.org/10.1071/ch03016.

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A low-temperature single-crystal X-ray structure determination of the 1 : 1 adduct of copper(II) nitrate with 2,2′-diphenyl-4,4′-bithiazole (L) shows it to be a molecular complex with L behaving as a symmetrical N,N′ chelate, and the nitrate groups as unsymmetrical O,O′ chelates: [LCu(O2NO)2]. Two polymorphs, both monoclinic P21/c, have been obtained from acetonitrile (‘α’) and methanol (‘β’), respectively, with one molecule, devoid of crystallographic symmetry, in the asymmetric unit of each structure. The copper environments are distorted planar four-coordinate, cis-N2CuO2 (Cu–N 2.011(1), 1.

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34

ALOTHMAN, ASMA A., MUNIRAH D. ALBAQAMI, and RAZAN A. ALSHGARI. "Spectral Characterization, Thermal and Antimicrobial Studies of Some Divalent Metal Chelates of 7-((3-Phenyl-4,5-dihydroisoxazol-5-yl)methyl)quinolin-8-ol." Asian Journal of Chemistry 32, no. 9 (2020): 2356–64. http://dx.doi.org/10.14233/ajchem.2020.22746.

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A series of Cu(II), Ni(II) and Co(II) azo chelates (AZC1-AZC3) of 7-((3-phenyl-4,5-dihydroisoxazol-5-yl)methyl)quinolin-8-ol have been designed and obtained. Thermal measurements, molar conductance, magnetic moment, elemental analyses, spectral (IR, UV-Vis, 1H and 13C NMR, ESR, mass) were used to characterize insulated solid complexes. The metal complexes were assumed to be non-electrolytic by molar conductance values. Thermal properties and decomposition kinetics of the metal chelates are investigated using Coats-Redfern method. The kinetic parameters like activation energy (E*), pre-exponent

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35

Brückner, Christian, Veranja Karunaratne, Steven J. Rettig, and David Dolphin. "Synthesis of meso-phenyl-4,6-dipyrrins, preparation of their Cu(II), Ni(II), and Zn(II) chelates, and structural characterization of bis[meso-phenyl-4,6-dipyrrinato]Ni(II)." Canadian Journal of Chemistry 74, no. 11 (1996): 2182–93. http://dx.doi.org/10.1139/v96-245.

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meso-Phenyldipyrromethanes can be oxidized by 2,6-dicyano-3,5-dichloro-para-benzoquinone (DDQ) to the corresponding meso-phenyldipyrrins. As expected, these novel, stable bipyrrolic pigments readily form metal chelates with copper(II), nickel(II), and zinc(II). Their UV–VIS spectra are compared with a series of known alkyl-substituted dipyrrin chelates and, based on the UV–VIS spectral analysis, the dihedral angle between the two ligands in the bis[meso-phenyldipyrrinato]Ni(II) complex was calculated to be 42°. The molecular structure of this complex was determined by X-ray crystallography, es

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36

Al-Radadi, Najlaa S., Ehab M. Zayed, Gehad G. Mohamed, and Hayam A. Abd El Salam. "Synthesis, Spectroscopic Characterization, Molecular Docking, and Evaluation of Antibacterial Potential of Transition Metal Complexes Obtained Using Triazole Chelating Ligand." Journal of Chemistry 2020 (February 24, 2020): 1–12. http://dx.doi.org/10.1155/2020/1548641.

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Mononuclear chelates of Ni(II), Co(II), Fe(III), Cd(II), and Cu(II) derived from triazole novel tridentate ligands were prepared and characterized by different spectroscopic methods. The metal to ligand ratio was 1 : 2, which was revealed by elemental analysis. All the complexes were electrolytic in nature as suggested by the conductivity measurements. IR pointed out that the coordination of the triazole ligand toward the metal ions was carried out through N amino and S thiophenolic atoms. The complexes were found to have octahedral geometry, and their thermal stability was also studied. The X

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37

Kurtoglu, Nurcan. "Synthesis, characterization, chelation with transition metal ions, and antibacterial and antifungal studies of the 4-[(E)- -phenyldiazenyl]-2-[(E)-(phenylimino)methyl]phenol dye." Journal of the Serbian Chemical Society 74, no. 8-9 (2009): 917–26. http://dx.doi.org/10.2298/jsc0909917k.

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New Ni(II), Cu(II) and Co(II) complexes were synthesized with the bidentate azo-azomethine dye, 4-[(E)-phenyldiazenyl]-2-[(E)-(phenylimino)methyl] phenol (dmpH), which was prepared by the reaction of 2-hydroxy-5-[(E)- phenyldiazenyl]benzaldehyde with aniline in EtOH. The syntheses of the metal chelates of the azo-azomethine dye were realized by the precipitation technique. The synthesized metal complexes were characterized by elemental analysis, molar conductance measurements, as well as infrared and UV-Vis spectral data. Based on these characterizations, the metal complexes of the transition

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38

ONOFREI, TINCA, CECILIA ARSENE, and CARMEN MITA. "SORPTION AND SEPARATION OF Cu(II), Co(II) AND Ni(II) ON 1(4-AZOBENZYLCELLULOSE)-2-NAPHTOL." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 5, no. 5 (1997): 79–85. http://dx.doi.org/10.48141/sbjchem.v5.n5.1997.79_1997.pdf.

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The mechanism of Cu(ll), Co(ll), and Ni(ll) sorption on 1(4-azobenzylcellulose)-2-naphthol has been investigated along with the possible chromatographic separation of the three elements on this chelating sorbent. The data obtained from the dependence of the distribution coefficients on pH and from isotherms, as well, have evidenced that physical sorption of the three elements is accompanied by chemical sorption, adsorption being predominant for Co(ll) and chemosorption for Ni(ll) and Cu(ll) being much more pronounced for the last element. The modifications in IR and diffuse reflectance spectra

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39

Chohan, Zahid H., S. K. A. Sherazi, M. Praveen, and M. S. Iqbal. "Synthesis, Ligational and Biological Properties of Cobalt(II), Copper(II), Nickel(II) and Zinc(II) Complexes With Pyrazinedicarboxaimide Derived Furanyl, Thienyl and Pyrrolyl Compounds." Metal-Based Drugs 5, no. 6 (1998): 347–54. http://dx.doi.org/10.1155/mbd.1998.347.

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Preparation, ligational and biological properties of some pyrazinedicarboxaimide derived furanyl, thienyl and pyrrolyl compounds with Co(ll), Cu(ll), Ni(ll) and Zn(ll) metals are described. Magnetic moments, electronic, infrared, nuclear magnetic resonance spectra and elemental analysis data indicate that co-ordination of the ligands with the metal ions take place through the pyrazine ring nitrogen, azomethine nitrogen and heteroatom of heterocyclic ring system. The compounds are all novel and are proposed to possess an octahedral geometry for Co(ll) and Ni(ll), and a distorted octahedral geom

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40

Liu, Wengang, Hao Duan, Dezhou Wei, Baoyu Cui, and Xinyang Wang. "Stability of diethyl dithiocarbamate chelates with Cu(II), Zn(II) and Mn(II)." Journal of Molecular Structure 1184 (May 2019): 375–81. http://dx.doi.org/10.1016/j.molstruc.2019.02.009.

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41

D., Prakash, Kumar Chandan, and R. R. P. Singh K. "Binuclear complexes of CuII and NiII Schiff base of 2-hydroxy-1-naphthaldehyde and o-phenylenediamine with alkali metal salts of oxygen and nitrogen containing organic acids." Journal of Indian Chemical Society Vol. 85, Apr 2008 (2008): 371–75. https://doi.org/10.5281/zenodo.5814736.

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Department of Chemistry, Patna University, Patna-800 005, Bihar, India <em>Manuscript received 1 October 2007, accepted 12 December 2007</em> A number of stable heterobinuclear alkali metal complexes of general formula M<sub>a</sub>PhN.MbL, where M8 Cu<sup>ll</sup> or Ni<sup>ll</sup>; Mb = Li, Na or K; PhN = <em>N,N'</em>-1,2-phenylene-bis(2-hydroxy-1-naphthaldimine); L = deprotonated onitrophenol (ONP), 2,4-dinitrophenol (DNP), 2,4,6-trinitrophenol (TNP) or 1-nitroso-2-naphthol (1N2N) have been synthesized using Cu<sup>II</sup> or Ni<sup>II</sup> metal chelates of Schiff base and alkali m

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42

Indira Priyadarshini and Dr. Rajesh Ranjan Pandey. "Synthesis, Characterization and Antimicrobial Activity of Homonuclear Cu(II) and Ni(II) Schiff Base Complexes." Journal of Advances in Science and Technology 20, no. 2 (2024): 96–100. http://dx.doi.org/10.29070/cp5vsm97.

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The current study aimed to synthesise, characterise, and investigate the antimicrobial activity of homonuclear Cu(II) and Ni(II) Schiff base complexes. Homonuclear Schiff Base Complexes chelates of Cu(II) and Ni(II) were synthesised. It appears that the complex is a potential metallo-ligand. It forms binuclear complexes when it reacts with two different metal salts, Ni and Cu. Using a Schiff base ligand made from 4-chloro-o-phenylenediamine and 3,5-dichloro-2-hydroxyacetophenone, the homo and hetero binuclear oxygen bridging Cu(II) and Ni(II) complexes were synthesized. Numerous common physico

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43

Chandra, Sulekh, and R. Singh. "Bis(thiosemicarbazonato) chelates of Co(II), Ni(II), Cu(II), Pd(II) and Pt(II)." Spectrochimica Acta Part A: Molecular Spectroscopy 41, no. 9 (1985): 1109–12. http://dx.doi.org/10.1016/0584-8539(85)80013-1.

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44

McCann, Malachy, Majella Geraghty, Michael Devereux, Denis O'Shea, James Mason, and Luzveminda O'Sullivan. "Insights Into the Mode of Action of the Anti-Candida Activity of 1,10-Phenanthroline and its Metal Chelates." Metal-Based Drugs 7, no. 4 (2000): 185–93. http://dx.doi.org/10.1155/mbd.2000.185.

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Metal complexes of malonie acid (metal = Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Ag(I)) were prepared and only the Ag(I) complex inhibited the growth of Candida albicans. Malonate complexes incorporating the chelating 1,10-phenanthroline (1,10-phen) ligand showed a range of activities: good (Mn(II), Cu(II), Ag(I)); moderate (Zn(II)); poor (Co(II), Ni(II)). Metal-free 1,10-phen and Ag(CH3CO2) were also highly active. The metal-free non-chelating ligands 1,7- phenanthroline and 4,7-phenanthroline were inactive and the Cu(II), Mn(II) and Zn(II) complexs of 1,7-phen displayed only marginal activit

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45

S., B. KHATAVKAR, S. SADANA G., and A. DESHMUKH A. "Structural Investigations of Copper(II), Nickel(II) and Cobalt(II) Complexes of Phenylazobenzoylacetone." Journal of Indian Chemical Society Vol. 65, Aug 1988 (1988): 529–31. https://doi.org/10.5281/zenodo.6024376.

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Department of Chemistry, G. N. Khalsa College, Matunga, Bombay-400 019 <em>Manuscript received 14 April 1986, revised 11 April 1988, accepted 1 June 1988</em> Complexes of copper(II), nickel(II) and cobalt(II) of phenylazobenzoylacetone (PABA) have been isolated in solid state and characterised on the basis of elemental analysis, magnetic, uv-visible and it spectral data. Physicochemical data provide evidences for the existance of octahedral Cu.HR<sub>2</sub>.CI.H<sub>2</sub>O, Cu(HR)<sub>2</sub>,(ClO<sub>4</sub>)<sub>2</sub> Cu(HR)<sub>2</sub>,(NO<sub>2</sub>)<sub>2</sub> Ni(HR)<sub

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46

I., Rama, and Selvameena R. "Manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) complexes of sulfathiazole functionalised Schiff base: Synthesis, characterization, redox behavior, antioxidant and antimicrobial activities." Journal of Indian Chemical Society Vol. 97, No. 11a, Nov 2020 (2020): 2144–54. https://doi.org/10.5281/zenodo.5653011.

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P.G. and Research Department of Chemistry, Seethalakshmi Ramaswami College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli-620 002, Tamil Nadu, India <em>E-mail</em>: rama14jai@yahoo.co.in <em>Manuscript received online 01 October 2020, revised and accepted 27 November 2020</em> Metal chelates of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) acetates with Schiff base ligand obtained from sulfathiazole and 5–nitro salicylaldehyde (HL) have been synthesized. The structural traits of the ligand and its complexes have been construed by microanalytical data, electrical condu

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47

R., B. Mohod, V. Wasu R., and S. Aswar A. "Synthetic, structural and electrical studies of some polychelates derived from bis(mercaptoacetamido)-3,3' -dimethoxybenzidene." Journal of Indian Chemical Society Vol. 78, Jan 2001 (2001): 34–36. https://doi.org/10.5281/zenodo.5849847.

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Department of Chemistry, Amravati University, Amravati-444 602, India <em>Manuscript received 17 April 2000. revised 17 July 2000, accepted 26 August 2000</em> The polychelates of Mn<sup>II</sup>, Co<sup>II</sup> , Ni<sup>II</sup> Cu<sup>II</sup>, Zn<sup>II</sup> and Cd<sup>II</sup>-bis(mercaptoacetamido)dimethoxybenzidene (BMADMB) have been prepared. In these chelates, the ligand BMADMB exhibits bis-bidentate character and coordinates symmetrically with the metal through nitrogen of amido and sulfur of mercapto groups. Thermogravimetric studies indicate a two-stage decompositio

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48

Shevchenko, O. V., and K. V. Burenkova. "CHELATES OF 3-ALLYLPENTAN-2,4-DIONE FOR THE SYNTHESIS OF BRANCHED THERMOSTABLE POLYMETHYL METHACRYLATE." Odesa National University Herald. Chemistry 27, no. 3(83) (2023): 76–84. http://dx.doi.org/10.18524/2304-0947.2022.3(83).268935.

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Radical polymerization of methyl methacrylate with the addition of Cu(II), Ni(II), Co(II) 3-allylpentan-2,4-dione chelates was carried out. It is shown that in the case of the cobalt complex, the process occurs at rates comparable to those of the traditional radical initiator, benzoyl peroxide. The resulting polymethyl methacrylate has large molecular weights and contains fragments of β-diketonates in the polymer, which graft side chains. The branched structure of the polymer is proven based on the calculation of the Zimm-Stockmeier factor. It has been established that the branched polymethyl

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49

Dominguez-Martin, Alicia, Ángel García-Raso, Catalina Cabot, et al. "Structural insights on the molecular recognition patterns between N6-substituted adenines and N-(aryl-methyl)iminodiacetate copper(II) chelates☆." Journal of Inorganic Biochemistry 127 (October 20, 2013): 141–49. https://doi.org/10.1016/j.jinorgbio.2013.02.002.

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For a better understanding of the metal binding pattern of N6-substituted adenines, six novel ternary Cu(II) complexes have been structurally characterized by single crystal X-ray diffraction: [Cu(NBzIDA)(HCy5ade)(H2O)] · H2O (1), [Cu(NBzIDA)(HCy6ade)(H2O)] · H2O (2), [Cu(FurIDA)(HCy6ade)(H2O)] · H2O (3), [Cu(MEBIDA)(HBAP)(H2O)] · H2O (4), [Cu(FurIDA)(HBAP)]n (5) and {[Cu(NBzIDA)(HdimAP)] · H2O}n (6). In these compounds NBzIDA, FurIDA and MEBIDA are N-substituted iminodiacetates with a non-coordinating aryl-methyl pendant arm (benzyl in NBzIDA, p-tolyl in MEB

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50

Castañeda-Arriaga, Romina, Adriana Perez-Gonzalez, Tiziana Marino, Nino Russo, and Annia Galano. "Antioxidants into Nopal (Opuntia ficus-indica), Important Inhibitors of Free Radicals’ Formation." Antioxidants 10, no. 12 (2021): 2006. http://dx.doi.org/10.3390/antiox10122006.

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Nopal (Opuntia ficus indica) belonging to the Cactacea family has many nutritional benefits attributed to a wide variety of phenolic and flavonoid compounds. Coumaric acid (COA), ferulic acid (FLA), protocatechuic acid (PRA), and gallic acid (GAA) are the phenolic acids (PhAs) present in nopal. In this study, the role of these PhAs in copper-induced oxidative stress was investigated using the density functional theory (DFT). The PhAs form 5 thermodynamically favorable complexes with Cu(II), their conditional Gibbs free energies of reaction (ΔG’, at pH = 7.4, in kcal/mol) are from −23 kcal/mol

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