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Journal articles on the topic 'Schiff Base Chelates'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Varshney, Anshita, and A. P. Mishra. "Novel Ni(II) and Zn(II) Schiff base metal chelates as promising DNA binder, Antioxidant and Antifungal agents." Mediterranean Journal of Chemistry 14, no. 2 (2024): 94. http://dx.doi.org/10.13171/mjc02405211777varshney.

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<p>Schiff base ligands and their 3d-metal chelates have gained significant attention due to various applications in various scientific platforms. Due to their chelating propensity, they possess a wide range of biological, biochemical, catalytic, clinical, dying, and pharmacological properties.<strong> </strong>Here, in present studies,<strong> </strong>two novel Ni(II) and Zn(II) transition metal chelates have been synthesized by condensing their metal salts with Schiff base ligand 4-chloro-2-(2,5-dimethoxybenzylideneamino)-5-nitrophenol<strong> </strong&

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2

Okada, Chiaki, Noriyuki Hatae, and Eiko Toyota. "Structural study of the Schiff base copper(II) chelates as thrombin inhibitor." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1665. http://dx.doi.org/10.1107/s205327331408334x.

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Thrombin is a trypsin-like serine protease that plays a critical role in the blood coagulation cascade. Thus, studies on thrombin-specific inhibitor are useful for the design of clinical useful compounds. We have previously reported of the Schiff base metal chelates carrying benzamidine and amino acid moieties. More than 50 kinds of Schiff base copper(II) chelates were synthesized fromp- orm-amidinosalicylaldehyde and various L- or D-amino acids. These chelates have effective inhibitory activity for trypsin and thrombin (Ki= 10-5~ 10-6M). In this series of inhibitors, the copper(II) chelate de

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3

El-ajaily, M. M., H. A. Abdullah, Ahmed Al-janga, E. E. Saad, and A. A. Maihub. "Zr(IV), La(III), and Ce(IV) Chelates with 2-[(4-[(Z)-1-(2-Hydroxyphenyl)ethylidene]aminobutyl)-ethanimidoyl]phenol: Synthesis, Spectroscopic Characterization, and Antimicrobial Studies." Advances in Chemistry 2015 (February 1, 2015): 1–15. http://dx.doi.org/10.1155/2015/987420.

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La(III), Zr(IV), and Ce(IV) chelates of 2-[(4-[(Z)-1-(2-hydroxyphenyl)ethylidene]aminobutyl)-ethanimidoyl]phenol were synthesized and characterized by using several physical techniques. The Schiff base was obtained by refluxing of o-hydroxyacetophenone with 1,4-butanediamine in 2 : 1 molar ratio. The CHN elemental analysis results showed the formation of the Schiff base and the chelates has been found to be in 1 : 1 [M : L] ratio. The molar conductance measurements revealed that all the chelates are nonelectrolytes. Structural elucidations of the ligand and its chelates were based on compatibl

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4

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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5

Hamil, Abdusalam, Marei El-ajaily, Lila Basher, Asma ramli, Miloud Miloud, and S. A. Saad. "Synthesis, Characterization and Antimicrobial evaluation of some mixed ligand chelates using 2-aminobenzoic acid as a secondary ligand." Libyan Journal of Medical Research 18, no. 1 (2024): 18–27. http://dx.doi.org/10.54361/10.26719/ljm18-1.02.

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The present work deals with the preparation of four mixed ligand chelates that resulted from the reaction of Schiff base[coupling of 2-hydroxyacetophenone and 2,4-dinitrophenylhydrazine (HL1) and 2-aminobenzoic acid (L2)]. The Schiff base, 2-aminobenzoic acid and their mixed ligand chelates were offered to several physicochemical tools; CHN elemental analyses, molar conductivity, magnetic moments, thermogravimetric analysis, IR and 1HNMR, Basis on the obtained results, the mixed ligand chelates appeared in the 1:1:1 [M:L1:L2] ratio as found from the elemental analysis data and found to have th

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6

Veeravel C, Rajasekar K, Balasubramanian S, and Selvarani R. "Green Route Synthesis of Bio-active Cd(II) and Hg(II) Complexes With ‘N’ Donor Novel Schiff base and Oxalate ion." International Journal of Research in Pharmaceutical Sciences 12, no. 2 (2021): 1689–94. http://dx.doi.org/10.26452/ijrps.v12i2.4768.

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Green route synthesis of bio-active diamagnetic Cd(II) and Hg(II) complexes with Schiff base and oxalate ion were synthesized using water as a solvent and characterized by using electronic spectra (UV-visible), Fourier transforms infrared (FT-IR), 1H and 13C-NMR spectroscopy, mass spectra and physical characterization such as CHN analysis, metal estimation and molar conductivity. 1H- and 13C-NMR spectra of ligand complex compared with Schiff base. The complexes have the general formula of ML2X (M= Cd(II) & Hg(II), L-C15H13N, X-C2O4 ) confirmed based on the results of elemental analysis, me

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7

Cai, Wen-Xuan, Qi-Wei Zhang, Hong Su та Yun-Long Feng. "catena-Poly[[bis(μ-3-dimethylamino-N-salicylidenepropylamine)isothiocyanatodicadmium(II)]-μ-isothiocyanato]". Acta Crystallographica Section E Structure Reports Online 62, № 7 (2006): m1572—m1574. http://dx.doi.org/10.1107/s160053680602085x.

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The deprotonated 3-dimethylamino-N-salicylidenepropylamine Schiff base chelates to a Cd atom in the polymeric title compound with a dinuclear building block, [Cd2(NCS)2(C12H17N2O)2] n . The O atom of the Schiff base also engages in bridging. The bridging NCS group links adjacent dinuclear entities into a helical chain that runs along the b axis of the monoclinic unit cell.

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8

Mohamed, Amira A., Fatma M. Ahmed, Wael A. Zordok, Walaa H. El-Shwiniy, Sadeek A. Sadeek, and Hazem S. Elshafie. "Novel Enrofloxacin Schiff Base Metal Complexes: Synthesis, Spectroscopic Characterization, Computational Simulation and Antimicrobial Investigation against Some Food and Phyto-Pathogens." Inorganics 10, no. 11 (2022): 177. http://dx.doi.org/10.3390/inorganics10110177.

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Condensation of the reaction between enrofloxacin and ethylenediamine in the existence of glacial acetic acid produced a new N,N-ethylene (bis 1-cyclopropyl-7-(4-ethylpiperazin-1-yl)-6-fluoro-1,4-dihydroquinoline-3-carboxylic acid Schiff base (H2Erx-en). H2Erx-en was used as a tetra-dentate ligand to produce novel complexes by interacting with metal ions iron(III), yttrium(III), zirconium(IV), and lanthanum(III). The synthetic H2Erx-en and its chelates had been detected with elemental analysis, spectroscopic methods, mass spectrometry, thermal studies, conductometric and magnetic measurements

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9

Hamil, Abdusalam, Marei El-ajaily, Lila Basher, Asma Ramli, Miloud Miloud, and S. A. Saad. "Mixed ligand chelates using Schiff base and 2-aminobenzoic acid as ligands." Libyan Journal of Medical Research 18, no. 1 (2024): 1–17. http://dx.doi.org/10.54361/10.26719/llmr18-1.01.

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The ligands under investigation were used to form five mixed ligand chelates with some transition metal ions. The ligands and their chelates were offered to several analytical and spectroscopic tools. Based on the obtained results; an octahedral structure was proposed for all the chelates. Also, the antibacterial activity was tested on two types of bacteria; Staphylococcus aureus and E.coli species.

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10

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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11

Prakash, Sachin, Anju K. Gupta, Shivani Prakash, K. R. R. P. Singh, and D. Prakash. "Synthesis and characterization of heterobinuclear copper(II) complexes derived from Schiff base with organosilver(I)." Research Journal of Chemistry and Environment 26, no. 2 (2022): 126–30. http://dx.doi.org/10.25303/2602rjce126130.

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Copper(II) ion can form complexes with varied ligands. The present study describes the synthesis of a series of new hetero binuclear Schiff base complexes of copper(II) and organic chelates of silver(I). The Schiff base ligand was derived from salicylaldehyde and ophenylenediamine. For the characterization of the hetero binuclear complexes, various physicoanalytical and spectral studies viz. elemental analysis, magnetic moment measurements, molar conductance, FTIR and electronic spectral recordings were applied. Evidences from these analyses reveal square geometry for the complexes.

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12

Kumar, Anil, G. L. Choudhry, Hasmat Ali, Aditya Kumar, and D. K. Yadav. "Synthesis, Spectral Characterization and Microbial Activity of Ni (II) Complex with DBAP Schiff’s Base Ligand." RESEARCH REVIEW International Journal of Multidisciplinary 4, no. 4 (2019): 2465–72. http://dx.doi.org/10.31305/rrijm.2019.v04.i04.528.

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Ni (II) complexes were synthetized from the Schiff Base Ligand. The Schiff base ligand [DBAP] (L) is prepared when 3,4- dimethoxy benzaldehyde reacts with 3- amino pyridine. Elemental Analysis, FTIR, UV analysis, HRMS, Magnetic Susceptibility and Molar Conductance data have concluded information regarding the nature of bonding and geometry of the transition metal complex as well as Schiff base Ligand. The Ligand (L) acts as bidentate and co-ordinate through Nitrogen atom of imine group (azomethine group) & Nitrogen atom of the Pyridine ring. Bacterias like E.coli and Bacillus Subtilis (by

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13

Younes, Ayman A. O. "Synthesis, biological evaluation and molecular docking studies of novel mixed-ligand Schiff base/8-hydroxyquinoline metal complexes." Materials Express 13, no. 12 (2023): 2110–27. http://dx.doi.org/10.1166/mex.2023.2564.

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Five manufactured mixed ligands chelate of Schiff base (HL) in the presence of 8-hydroxyquinoline (HQ) with Chromium(III), Cobalt(II), Silver(I) tin(II), and mercury(II) was produced and described. The molecular structure of complexes was examined using physicochemical analysis, thermogravimetric analysis, and spectroscopic methods. Measurements of morphological properties confirm the nano-crystalline particles of the fabricated chelates. FT-IR analysis revealed that HL and HQ chelated with metal ions as NO bi-dentate ligands. The synthesized complexes have distorted octahedral (Cr(III) and Co

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14

G., P. SENGUPTA, R. BERA C., and N. GHOSH N. "Potentiometric Studies of Metal Schiff Base Chelates in Mixed Aquo-orgaolc Solvent Systems." Journal of Indian Chemical Society Vol. 64, Jun 1987 (1987): 366–68. https://doi.org/10.5281/zenodo.6222598.

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Department of Chemistry, Visva-Bharati University, Santiniketan-731 235 <em>Manuscript received 20 December 1985, revised 19 December </em><em>1986, accepted 10 June 1987</em> Potentiometric Studies of Metal Schiff Base Chelates in Mixed Aquo-orgaolc Solvent Systems.

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15

Siddiqi, K. S., A. Bashar, S. Tabassum, M. I. Khan, and S. A. A. Zaidi. "Lanthanide Metal Chelates with a Bidentate Schiff Base." Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 22, no. 7 (1992): 863–74. http://dx.doi.org/10.1080/15533179208016596.

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16

Yearwood, Burl, Sean Parkin, and David A. Atwood. "Synthesis and characterization of organotin Schiff base chelates." Inorganica Chimica Acta 333, no. 1 (2002): 124–31. http://dx.doi.org/10.1016/s0020-1693(02)00803-4.

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17

Costa, Giacomo, Claudio Tavagnacco, Anna Puxeddu, Gabriele Balducci, and Rakesh Kumar. "Electrochemistry of cobalt mixed Schiff base/oxime chelates." Journal of Organometallic Chemistry 330, no. 1-2 (1987): 185–99. http://dx.doi.org/10.1016/0022-328x(87)80287-5.

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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

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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20

Kazmi, Syed Atif Raza, Intazar Hussain Shah, Muqaddas Fatima, et al. "Synthesis and Characterization of Imine Derived from O-Amino Benzoic Acid and Its Metal Complexation." Scholars Journal of Engineering and Technology 13, no. 07 (2025): 492–521. https://doi.org/10.36347/sjet.2025.v13i07.005.

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The work present in this paper concern the preparation, characterization and biological evaluation of Cu2+, Ni2+, Co2+ and Mn2+ coordinated compound of ligand obtained from o- amino benzoic acid and furfur aldehyde. For the purpose of Schiff base an amino group present in 0-aminobenzoic acid react with furfur aldehyde during the condensation of one mole of furfur aldehyde and one mole of o-amino benzoic acid. Schiff base have ability to chelates through –C=N- functional group with metals. The complex was formulated as ML2 (2:1) type. Fourier transform infrared spectroscopy, solubility and melt

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21

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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22

Soundaranayaki, V., and A. Kulandaisamy. "Structural and Biological Studies on Transition Metal Complexes of 4-Aminoantipyrine Derivative." Asian Journal of Chemistry 32, no. 11 (2020): 2846–54. http://dx.doi.org/10.14233/ajchem.2020.22866.

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Novel tetra dentate Cu(II), Ni(II), Co(II), VO(II) and Zn(II) Schiff base complexes have been synthesized from salicylidene-4-iminoantipyrine and tyrosine. The synthesized Schiff base complexes was characterized by powder X-ray diffraction studies (XRD), scanning electron microscopy (SEM), FT-IR, ESR, 1H NMR, 13C NMR, UV-vis, molar conductance and magnetic susceptibility measurements. The general formula of complexes was confirmed as [ML] type [M = Cu(II), Co(II), Zn(II), Ni(II) and VO(II); L = C27H24N4O4]. Magnetic susceptibility, IR and UV-vis, spectral data showed that all the complexes hav

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23

Koch, Daniela, Winfried Hoffmüller, Kurt Polborn та Wolfgang Beck. "Metallkomplexe mit biologisch wichtigen Liganden, CXXXVII [1]. Halbsandwich-Komplexe mit N, O-Chelaten und Schiff-Basen von β-Aminosäuren/ Metal Complexes of Biologically Important Ligands, CXXXVII [1]. Halfsandwich Complexes with N, O-Chelates and Schiff Bases of β-Amino Acids". Zeitschrift für Naturforschung B 56, № 4-5 (2001): 403–10. http://dx.doi.org/10.1515/znb-2001-4-513.

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Abstract β-Phenylalanine forms with chloro bridged complexes the chiral N, O-chelates Cp*Ir(Cl)(NH2CH(Ph)CH2CO2) and (p-cymene)Ru(Cl)(NH2CHPhCH2CO2) as mixture of two diastereoisomers. Similarly the palladium(III) and platinum(II) complexes (Et3P)(Cl)M(NH2CH(Ph)CH2CO2) (M = Pd, Pt) were obtained. Schiff base complexes (arene)(Cl)M(O2CC(R)=N-CH(R)CH(R)CH2CO2CH3) (arene = Cp*, p-cymene; M = Ir, Ru) were synthesized from the chloro-bridged compounds, 2-oxocarboxylates and β-alanine or β-phenylalanine methylester. The Cp*Ir complex with a tridendate dianionic Schiff base generated from pyruvate an

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24

Imran, Muhammad, Mitu Liviu, Shoomaila Latif, et al. "Antibacterial Co(II), Ni(II), Cu(II) and Zn(II) complexes with biacetyl-derived Schiff bases." Journal of the Serbian Chemical Society 75, no. 8 (2010): 1075–84. http://dx.doi.org/10.2298/jsc091026098i.

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The condensation reactions of biacetyl with orthohydroxyaniline and 2-aminobenzoic acid to form bidendate NO donor Schiff bases were studied. The prepared Schiff base ligands were further utilized for the formation of metal chelates having the general formula [ML2.2H2O] where M = Co(II), Ni(II), Cu(II) and Zn(II) and L = HL1 and HL2. These new compounds were characterized by conductance measurements, magnetic susceptibility measurements, elemental analysis, and IR, 1H-NMR and electronic spectroscopy. Both Schiff base ligands were found to have a mono-anionic bidentate nature and octahedral geo

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25

Majthoub, Moh’d Mamoun Al. "Spectroscopic and Catalytic Discussions of the Alkaline Earth Metal Schiff Base Chelations Derived from Condensation of Furan-2-Carbaldehyde with 2-Chlorophenyl Hydrazine." Journal of Computational and Theoretical Nanoscience 13, no. 10 (2016): 7009–13. http://dx.doi.org/10.1166/jctn.2016.5661.

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Mg(II), Ca(II), Sr(II) and Ba(II) metal chelates with formulas, [Mg(HL)2(H2O)2] · Cl2, [Ca(HL)2(Cl)2], [Sr(HL)2(H2O)2] · Cl2 · 6H2O and [Ba(HL)2(H2O)2] · Cl2 that HL is the Schiff base moiety formed from condensation of furan-2-carbaldehyde with 2-chlorophenyl hydrazine have been prepared and characterized by elemental analysis and spectroscopic measurements (infrared, Mass and 1H-NMR). The microanalytical analyses (%C, %H and %N elements) of the Schiff base complexes deduce the 1:2 ratio of metal-to-ligand. The infrared spectra of the new Schiff base complexes led to identify the chelating ar

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26

Jacob, Jinsa Mary, M. R. Prathapachandra Kurup та Seik Weng Ng. "(Anilino{(Z)-2-[(E)-5-bromo-3-methoxy-2-oxidobenzylidene]hydrazin-1-ylidene-κ2O2,N2}methanethiolato-κS)(4,4′-dimethyl-2,2′-bipyridine-κ2N,N′)zincN,N-dimethylformamide monosolvate". Acta Crystallographica Section E Structure Reports Online 68, № 8 (2012): m1089. http://dx.doi.org/10.1107/s1600536812031777.

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The asymmetric unit of the title compound, [Zn(C15H12BrN3O2S)(C12H12N2)]·C3H7NO, contains two independent molecules with a similar structure. The doubly deprotonated Schiff base ligandO,N,S-chelates to the metal atom, and the three coordinating atoms along with one N atom of the substituted 2,2′-bipyridine ligand constitute the square plane of the distorted square pyramid surrounding the metal atom. The apical site is occupied by the second N atom of the substituted 2,2′-bipyridine. The secondary amine group of the Schiff base dianion forms a hydrogen bond to the O atom of the dimethylformamid

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B., K. DWIVEDI, and N. SRIVASTAVA I. "Transition Metal Schiff Base Chelates as Ligands towards Tin(ll) Halides and -lsothiocyanate." Journal of Indian Chemical Society Vol. 62, Mar 1985 (1985): 246–49. https://doi.org/10.5281/zenodo.6302589.

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Department of Chemistry, B. S, N.<em> </em>V. Degree College, Lucknow Department of Chemistry, Lucknow University, Lucknow-228007 <em>Manuscript received 21 March 1984, reputed 16 October 1984, </em><em>accepted 15 'ebruary 1985</em> Transition Metal Schiff Base Chelates as Ligands towards Tin(ll) Halides and -lsothiocyanate.

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28

M. El-Barasi, N., S. F. Algazale, M. M. El-Ajaily, et al. "Synthesis, characterization, theoretical study and biological evaluation of Schiff base and their La(III), Ce(IV) and UO2(II) complexes." Bulletin of the Chemical Society of Ethiopia 37, no. 2 (2022): 335–46. http://dx.doi.org/10.4314/bcse.v37i2.7.

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ABSTRACT. A new three metal complexes of La(III), Ce(IV) and UO2(II) ions have been synthesized based on a Schiff base derived from the condensation of L-histidine and anisaldehyde. All prepared compounds were characterized by different spectroscopic techniques and Density-functional theory (DFT) calculations. The complexes were proposed to have an octahedral structure based on the investigated results. The optimized shape, numbering system, and dipole moment vector of Ligand and La, Ce, and UO2 (1:1) chelates were investigated. The Schiff base ligand and complexes exhibit moderate action agai

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Dina A. Najeeb and Farah M. Ibrahim. "Synthesis, Characterization and Thermal Studies of Cr (III), Co (II) and Ni (II) Complexes with Schiff Base." International Journal of Research in Pharmaceutical Sciences 11, no. 4 (2020): 8026–33. http://dx.doi.org/10.26452/ijrps.v11i4.4755.

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The physiologically active compounds of Schiff bases find application in the treatment of several diseases. This biological activity of Schiff base is attributed to the formation of stable chelates with a transition metal, and they are known to exhibit a wide variety of pharmacological properties and carcinostatic activities. Cr (III), Co (II), and Ni (II) complexes of Schiff base were chosen for the present experimental work and theoretical treatment and characterized by different spectroscopies such as elemental analysis CHN, infrared, ultra visible spectroscopies, magnetic susceptibility, m

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30

Hari, S. Yadav, and L. Kumawat Gopal. "Synthesis, Spectroscopic, Biological, and Theoretical Evaluation of Novel Zirconium (IV) N, O Donor Amino Acid Schiff Base Complexes." Chemistry Research Journal 8, no. 1 (2023): 12–22. https://doi.org/10.5281/zenodo.11296500.

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<strong>Abstract </strong>A series of<strong> </strong>novel dichlorozirconium (IV) Schiff bases complexes [ZrCl<sub>2</sub> (L)<sub>2</sub>] (LH = N, O donor Schiff base derived by the condensation of 2-Acetyl-5-methylfuran & 2-acetyl-4-methyl thiophene with amino acids) were synthesized by the reaction of zirconium (IV) chloride and sodium salt of an N, O donor Schiff base ligand and characterized. The authenticity of all the synthesized ligands and their Zr (IV) complexes had been elucidated by microanalysis, various spectroscopic techniques like FT-IR, <sup>1</sup>H NMR, <sup>13</sup>C

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31

Puthilibai, G., V. Devatarika, Byeon Haewon, et al. "Synthesized and hypothesized schiff base ligand and its metal(II) complexes DNA binding mode." Bulletin of the Chemical Society of Ethiopia 37, no. 5 (2023): 1133–39. http://dx.doi.org/10.4314/bcse.v37i5.6.

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ABSTRACT. Metal complexes play an important role in agriculture, pharmacology, medicine, and industrial chemistry. Schiff base metal compounds are the fusion products of propene and aldehydes, require a metal surrounded by an ion or cluster of molecules to form. Metal complexes of Co(II), Ni(II), Cu(II), and Zn(II) have also been created. Elemental analysis is used to analyses the structure and related compounds of the produced Schiff base ligand. According to deoxyribose nucleic acid (DNA) binding tests, Schiff base metal(II) complexes attach to DNA in an intercalative form with weak covalent

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Raju, Senthil Kumar, Shridharshini Kumar, and Praveen Sekar. "Synthetic methodologies and pharmacological applications of sulphonamide containing Schiff bases and their metal complexes: A comprehensive review." IP International Journal of Comprehensive and Advanced Pharmacology 8, no. 1 (2023): 10–21. http://dx.doi.org/10.18231/j.ijcaap.2023.002.

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Schiff bases are useful chemical compounds with a wide range of applications. The Schiff bases are synthesized via the condensation reaction between carbonyl compounds (aldehydes or ketones) and compounds having an amine group and the Schiff base is characterised by an imine or azomethine (-C=N-) group. These compounds are extensively used as ligands to form coordination complexes with metal ions and are widely utilized in the treatment of various ailments. Sulphonamides are biologically significant class of drug-like chemical derivatives due to their good oral absorption and urine excretion.

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Razzaq Ibrahim Al-Faris, Ahmed, Wafaa Mahdi Sachit Alkoofee, and . "Cobalt (II) and Nickel (II) Complexes with Schiff Base Ligand Derived From 4-Amino Antipyrine: Synthesis, Spectral, Characterization and Thermal Studies." International Journal of Engineering & Technology 7, no. 4.37 (2018): 198. http://dx.doi.org/10.14419/ijet.v7i4.37.24100.

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Metal complexes of the Schiff base ligand, synthesized via condensation p-dimethylamino benzaldehyde with Bis (4-aminoantipyrine) benzene 1, 4-diamine which has synthesized from condensation 1, 4-phenylene diamine and 4-aminoantipyrine, are synthesized from chloride salts of Co (II) and Ni(II) with ligand in ethanol. The metal complexes and ligand are characterized on the basis of elemental analyses, melting point, molar conductance, UV –Visible, FTIR and thermogravimetric analysis. The molar conductance data reveal that the metal chelates of the ligand with Co (II) and Ni (II) are electrolyte

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34

K. Singh, Bibhesh, Pinkee, Hament K. Rajor, and Jagdish Chandra. "METAL COMPLEXES OF SCHIFF BASE DERIVED FROM 4- (DIETHYLAMINO) SALICYLDEHYDE WITH ANILINE: CHARACTERIZATION, COMPUTATIONAL ANALYSIS, AND ANTIBACTERIAL ACTIVITY STUDY." RASAYAN Journal of Chemistry 15, no. 04 (2022): 2950–58. http://dx.doi.org/10.31788/rjc.2022.1548003.

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A biologically active Schiff base derived from 4-(diethylamino)salicylaldehyde with aniline and its Zn(II), Cd(II), Sn(II), and Pb(II) complexes have been synthesized and characterized by various physicochemical techniques. The structure optimization by computational analysis supports the geometry of the metal complexes. The Schiff base existed as a bidentate ligand bonded to the metal ion through the deprotonated phenolic oxygen and the azomethine nitrogen forming neutral ML2 metal chelates. The synthesized ligand and their metal complexes have been screened at three different concentrations

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35

N., Raman, Muthuraj V., and Ravichandran S. "Pyridinium hydrobromide perbromide as a brominating agent for the bromination of metal(II) complexes of Schiff base derived from acetylacetone and p-anisidine." Journal of Indian Chemical Society Vol. 82, May 2005 (2005): 443–44. https://doi.org/10.5281/zenodo.5830171.

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Department of Chemistry, VHNSN College, Virudhunagar-626 00 l. India E-mail: drn_raman@yahoo.co.in <em>Manuscript received 19 August 2002, revised 5 October 2004, accepted 2 February 2005</em> Pyridinium hydrobromide perbromide (PyHBr<sub>3</sub>) is used as a hrominating agent for the hrominalion of the Schiff hase chelates of copper(II), nickel( II), cobalt(II) and zinc(II) derived from acetylacetone and <em>p</em>-anisidine under acidic and ammoniacal conditions at room temperature. Under ammoniacal condition these complexes [M(H-acpa) 2 where M = Cu<sup>II</sup> , Ni<sup>II</sup> , Co<sup>

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36

Suresh, M. S., and V. Prakash. "Preparation Characterization and Antibacterial Studies of Chelates of Schiff Base Derived from4-Aminoantipyrine, Furfural ando-phenylenediamine." E-Journal of Chemistry 8, no. 3 (2011): 1408–16. http://dx.doi.org/10.1155/2011/254018.

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A new series of transition metal complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) were synthesized from the Schiff base ligand derived from 4-aminoantipyrine, furfural ando-phenylenediamine. The structural features were derived from their elemental analyses, infrared, UV-visible spectroscopy, NMR spectroscopy, thermal gravimetric analyses, ESR spectral analyses and conductivity measurements. The data of the complexes suggested square planar geometry for the metals with primary valency two. Antimicrobial screening tests were performed against bacteria. The comparative study of the MIC val

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Ganeshpure, P. A., S. Satish, and S. Sivaram. "Alkene epoxidation with iodosylbenzene catalysed by polymeric schiff base chelates." Journal of Molecular Catalysis 50, no. 1 (1989): L1—L5. http://dx.doi.org/10.1016/0304-5102(89)80102-6.

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38

RABINDBR, NATH, and P. BHATNAGAR R. "Study of the Complexes obtained from Interaction between Copper(II) Chelates of 2-Hydroxyaromatic Ketones and Aralkyl Monoamines." Journal of Indian Chemical Society Vol. 63, May 1996 (1986): 463–65. https://doi.org/10.5281/zenodo.6277137.

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Defence Research and Development Establishment, Gwalior-474 002 School of Studies in Chemistry, Jiwaji University, Gwalior-474 011 <em>Manuscript received 10 October 1984, revised 14 April 1986, accepted 23 April 1986</em> The title interaction has been studied in ethanol medium under reflux conditions and also in restricted amount of the solvent at room temperature. Square-planar Schiff base complexes result under the first set of conditions. But at room temperature diamine adducts seem to be formed. A mechanism envisaging an initial rapid coordination of the primary amine to the central meta

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39

Prashanthi, Y., K. Kiranmai, Tentu Nageswara Rao, and Shivaraj. "Preparation, Characterization, and Biological Assessment of Heterocyclic Schiff Base Metal Complexes." Advances in Research 25, no. 4 (2024): 47–56. http://dx.doi.org/10.9734/air/2024/v25i41080.

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MIIMC, MMIIMC, and CMIIMC are biologically significant Schiff bases formed by the condensation of 3-amino-5-methyl isoxazole with formyl chromone. Substituted formyl chromones and metal chelates containing Cu(II), Ni(II), Co(II), and Zn(II) are prepared. These were studied utilising elemental analysis, FTIR, UV-VIS, 1H, 13C, mass spectra, magnetic susceptibility, conductance tests, and thermogravimetric techniques. The data revealed that the ligands display neutral, bidentate coordination through carbonyl oxygen and azomethine nitrogen. The antibacterial activity of the ligands and metal compl

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40

Mohamed, Amira A., Abeer A. Nassr, Sadeek A. Sadeek, Nihad G. Rashid, and Sherif M. Abd El-Hamid. "First Report on Several NO-Donor Sets and Bidentate Schiff Base and Its Metal Complexes: Characterization and Antimicrobial Investigation." Compounds 3, no. 3 (2023): 376–89. http://dx.doi.org/10.3390/compounds3030029.

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The condensation product of the reaction between aniline and salicylaldehyde was a 2-(2-hydroxybenzylidinemine)—aniline Schiff base bidentate ligand (L). L was used to generate complexes by interacting with the metal ions lanthanum(III), zirconium(IV), yttrium(III), and copper(II), in addition to cobalt(II). Various physicochemical techniques were utilized to analyze the synthesized L and its metal chelates, including elemental analysis (CHN), conductimetry (Λ), magnetic susceptibility investigations (μeff), Fourier-transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance (1H

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(MRS.), L. NALANDA SIIARADA, C. GANORKAR M., and RAMA RAO N. "Structural Study of Metal Chelates derived from Tridentate Ligand." Journal of Indian Chemical Society Vol. 72, Jul 1995 (1995): 439–42. https://doi.org/10.5281/zenodo.5905073.

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Department of Chemistry, University College for Women. Koti, Hyderabad-500 001 Birla Institute of Scientific Research, Asmangadh Palace. Malakpet. Hyderabad-500 036 <em>Manuscript received 4 October 1991. revised 13 October 1992, accepted 13 January 1994</em> Oxovanadium(IV), chmromium(III), manganese(III), iron(II), cobalt(II), nickei(II) and copper(II) complexes of the Schiff base derived from salicylhydrazide and 6-methyl-4-hydr·oxy-3-acetylcoumuin (Mc-HACSH) have been synthesised having 1: 1 metal-ligand ratio. The complexes are of non-electrolytic nature except

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42

Shakir AL-Nama, Khansaa, Israa Adnan Saeed, and Amera Faris Mohammed. "Synthesis, characterization, DFT, molecular docking, and in vitro screening of metal chelates incorporating Schiff base." Bulletin of the Chemical Society of Ethiopia 39, no. 4 (2025): 687–701. https://doi.org/10.4314/bcse.v39i4.7.

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The new complexes were formed by reacting Mn(II), Co(II), Ni(II), and Cu(II) with unsymmetrical Schiff base ligands, HL1 and HL2 , in a [1M:1L] molar ratio. Complexes were synthesized with high yields. Metal chelate structures were identified through FT-IR, elemental analyses, magnetic moment, and molar conductivity measurements. According to FT-IR findings, the Schiff base ligand HL1 acts as tridentate by binding with metal ions, confirming tetrahedral geometry. While the ligand HL2 is tetradentate, magnetic moment research indicated an octahedral structure. Theoretical calculations were perf

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Sanambatla, Vanitha, Sathish Kumar Nara, Balaji Hari, Varada Reddy Ammireddy, and Saritha Nimmakayala. "Antimicrobial and antioxidant studies of Schiff base, 2-(2-hydroxy-2-methyl-1-phenylpropylidene) hydrazine carbothioamide and its mixed ligand cd (II) complexes." Journal of medical pharmaceutical and allied sciences 11, no. 1 (2022): 4470–76. http://dx.doi.org/10.55522/jmpas.v11i1.2451.

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New mononuclear mixed ligand Cadmium(II) complexes of the type [Cd(L)(diimine)] (1,2) [where L = 2-(2-hydroxy-2-methyl-1-phenylpropylidene)hydrazinecarbothioamide; diimine = 2,2’-bipyridine (1), 1,10-phenanthroline (2)] have been synthesized and characterized by spectroscopic techniques such as FT-IR, UV-Visible, and1H and 13CNMR Spectroscopy. From the investigations of spectral data, it is evident that the heterocyclic bases (2,2’-bipyridine and 1,10-Phenanthroline) act as neutral bidentate ligand coordinating to the metal ion through two nitrogen donor atoms addition to azomethane nitrogen,

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44

M., K. Rahangdale, R. Yaul A., B. Pethe G., and S. Aswar A. "Synthesis, physicochemical and antibacterial studies of transition metal chelates involving tetradentate Schiff base." Journal of Indian Chemical Society Vol. 91, Oct 2014 (2014): 1891–98. https://doi.org/10.5281/zenodo.5733851.

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Department of Chemistry, Sant Gadge Baba Amravati University, Amravati-444 602, Maharashtra, India <em>E-mail </em>: aswaranand@gmail.com <em>Manuscript received online 23 July 2013, accepted 12 August 2014</em> The complexes of VO<sup>IV</sup>, Mn<sup>II</sup>, Fe<sup>III</sup>, Co<sup>II</sup>, Ni<sup>II</sup>, Cu<sup>II</sup>, Zn<sup>II</sup>, Cd<sup>II</sup>, MoO<sub>2</sub> <sup>V</sup>I and UO<sub>2</sub> <sup>VI</sup> with tetradentate Schiff base ligand derived from 2-hydroxy-5-chloroacetophenone and carbohydrazide have been prepared. These complexes have been characterized by elementa

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Dilli, S., A. M. Maitra, and E. Patsalidas. "Velocity and gas chromatography of some derivatives of Schiff base chelates." Journal of Chromatography A 318 (January 1985): 350–57. http://dx.doi.org/10.1016/s0021-9673(01)90696-x.

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46

Jain, A. K., V. K. Gupta, P. A. Ganeshpure, and J. R. Raisoni. "Ni(II)-selective ion sensors of salen type Schiff base chelates." Analytica Chimica Acta 553, no. 1-2 (2005): 177–84. http://dx.doi.org/10.1016/j.aca.2005.08.016.

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K., Syamasundar, and Adharvana Chary M. "Synthesis and antimicrobial properties of zinc-, cadmium- and mercury(II) complexes of sulfur donor ligands." Journal of Indian Chemical Society Vol. 78, Jan 2001 (2001): 32–33. https://doi.org/10.5281/zenodo.5849674.

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Department of Chemistry, JNTU College of Engineering, Kukatpally, Hyderabad-500 072, India <em>Manuscript received 7 December !999. revised 19 June 2000. accepted 26 August 2000</em> The tridentate Schiff base sulfur donor ligand forms complexes with divalent Zn, Cd and Hg. The complexes are four-coordinated with a tetrahedral geometry around the metal ions. The mass spectral data also support the assigned metal and ligand ratios. Metal chelates are more toxic in comparison with ligand.

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48

Mendu, Padmaja, J. Pragathi, B. Anupama, and C. Gyana Kumari. "Synthesis, Spectral Characterization, Molecular Modeling, and Antimicrobial Studies of Cu(II), Ni(II), Co(II), Mn(II), and Zn(II) Complexes of ONO Schiff Base." E-Journal of Chemistry 9, no. 4 (2012): 2145–54. http://dx.doi.org/10.1155/2012/839789.

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A series of Cu(II), Ni(II), Co(II), Mn(II), and Zn(II) complexes have been synthesized from the schiff base ligand L. The schiff base ligand [(4-oxo-4H-chromen-3-yl) methylene] benzohydrazide (L) has been synthesized by the reaction between chromone-3-carbaldehyde and benzoyl hydrazine. The nature of bonding and geometry of the transition metal complexes as well as schiff base ligand L have been deduced from elemental analysis, FT-IR, UV-Vis,1HNMR, ESR spectral studies, mass, thermal (TGA and DTA) analysis, magnetic susceptibility, and molar conductance measurements. Cu(II), Ni(II), Co(II), an

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49

M., L. GUPTA, and K. PANDE K. "Studies on Composition and Stability Constants of Complexes of Copper(ll) and Nickel(Il) with 2N-Salicylidene- and 2N-3,5-Dichlorosalicylidene-5-phenyl-1 ,3,4- thiadiazole Schiff Base." Journal of Indian Chemical Society Vol. 62, Jan 1985 (1985): 34–36. https://doi.org/10.5281/zenodo.6302329.

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Government Science College, Gwalior <em>Manuscript received 7 March 1984, accepted 8 November 1984</em> The composition, protonation constants of 2<em>N</em>-salicylidene-5-phenyl-1,3,4-thiadiazole and 2<em>N</em>-3,5-dichlorosalicylidene-5-phenyl-1,3,4-thiadiazole and formation constants of their metal-chelates with Cu<sup>ll</sup> and Ni<sup>ll</sup> in 50% ethanol-water system have been determined by Irving-Rossotti method at various ionic strengths at 25±1°. The observed order of the ligands on the basis of relative strength is SPT >DCSPT. The order of stability of the m

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50

Cyril, A., G. Senthamilselvan, B. Sithi, and A. Dhanalakshmi. "POTENTIALLY ACTIVE METAL OF COBALT, COPPER AND ZINC COMPLEXES DERIVED FROM SCHIFF BASE LIGAND OF 3-ETHOXY-2-HYDROXY-BENZALDEHYDE AND ANILINE FOR THEIR ANTICANCER ACTIVITY." Journal of Advanced Scientific Research 13, no. 02 (2022): 76–84. http://dx.doi.org/10.55218/jasr.202213211.

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New Schiff base transition metal complexes derived from 3-ethoxy-2-hydroxy-benzaldehyde and aniline were characterized by magnetic susceptibility measurements, molar conductance, MS, FT-IR, 1H-NMR, 13C-NMR, Absorbance and EPR spectra. The spectral evidences clearly showed that all the metal chelates distorted octahedral geometry except Zn(II) complex which exist square planar geometry. Electron Spin Resonance (ESR) spectrum of [CuL] complex was coinciding with proposed geometries and other reported complexes. All the synthesized compounds were studied for anticancer studies by MTT method using

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