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Journal articles on the topic 'Tetradentate Schiff base'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Nguyen, Quang Trung, Phuong Nam Pham Thi, and Van Tuyen Nguyen. "Synthesis, Characterization, and In Vitro Cytotoxicity of Unsymmetrical Tetradentate Schiff Base Cu(II) and Fe(III) Complexes." Bioinorganic Chemistry and Applications 2021 (May 3, 2021): 1–10. http://dx.doi.org/10.1155/2021/6696344.

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Unsymmetrical tetradentate Schiff base Fe(III) and Cu(II) complexes were prepared by the coordination of some unsymmetrical tetradentate Schiff base ligands with CuCl2·2H2O or FeCl3·6H2O. The obtained complexes were characterized by ESI-MS, IR, and UV-Vis. The spectroscopic data with typical signals are in agreement with the suggested molecular formulae of the complexes. Their cyclic voltammetric studies in acetonitrile solutions showed that the Cu(II)/Cu(I) and Fe(III)/Fe(II) reduction processes are at (−)1.882–(−) 1.782 V and at (−) 1.317–(−) 1.164 V, respectively. The in vitro cytotoxicity

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2

BAL, Mustafa. "Synthesis and Characterization of Tetradentate Schiff Base Ligand Containing 3,4-Diamino Benzophenone and Investigation of Complex Formation with Ni (II), Cu (II) and Co (II) metal ions." Cumhuriyet Science Journal 44, no. 2 (2023): 289–95. http://dx.doi.org/10.17776/csj.1210668.

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Compound that is a novel tetradentate Schiff base ligand [(3,4-bis(((E)-4-(diethylamino)-2-hydroxybenzylidene)amino)phenyl)(phenyl) methanone] (1), 4-(diethylamino) It was synthesized by the reaction of (3,4-diaminophenyl)(phenyl)methanone with -2-hydroxybenzaldehyde. Complex reactions with Co(II) (1a), Cu(II) (1b) and Ni(II) (1c) metals were prepared based on the obtained Schiff base ligand. The synthesized Schiff base and its Ni(II), Cu(II) and Co(II) complexes were featured using FT-IR, UV-vis, photoluminescence, mass and 1H and 13C-NMR spectroscopy. The characterization processes show that

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3

Reglinski, John, Alan R. Kennedy, and Graham Steel. "Tetradentate Schiff base beryllium complexes." New Journal of Chemistry 39, no. 4 (2015): 2437–39. http://dx.doi.org/10.1039/c4nj01949k.

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4

Al-Serwi, Rasha H., Gamal Othman, Mohammed A. Attia, et al. "Enhancement of Cisplatin Cytotoxicity by Cu(II)–Mn(II) Schiff Base Tetradentate Complex in Human Oral Squamous Cell Carcinoma." Molecules 25, no. 20 (2020): 4688. http://dx.doi.org/10.3390/molecules25204688.

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Oral squamous cell carcinoma (SCC) is one of the most predominant tumors worldwide and the present treatment policies are not enough to provide a specific solution. We aimed to assess the cytotoxic effect of Cu(II)–Mn(II) Schiff base tetradentate complex alone or in combination with cisplatin against squamous cell carcinoma cell line (SCCs) in vitro. Oral-derived gingival mesenchymal stem cells (GMSCs) were used as control. The cell viability was assessed by MTT assay. IC50 values were calculated. Evaluation of apoptosis and DNA damage were performed. In addition, the expression of pro-apoptot

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5

Mahmoudi, Ghodrat, Vladimir Stilinović, Masoumeh Servati Gargari, et al. "From monomers to polymers: steric and supramolecular effects on dimensionality of coordination architectures of heteroleptic mercury(ii) halogenide–tetradentate Schiff base complexes." CrystEngComm 17, no. 18 (2015): 3493–502. http://dx.doi.org/10.1039/c5ce00382b.

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6

Asadi, Mozaffar, Hajar Sepehrpour, and Khosro Mohammadi. "Tetradentate schiff base ligands of 3,4- diaminobenzophenone: Synthesis, characterization and thermodynamics of complex formation with Ni(II), Cu(II) and Zn(II) metal ions." Journal of the Serbian Chemical Society 76, no. 1 (2011): 63–74. http://dx.doi.org/10.2298/jsc100104004a.

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Some new symmetrical diimino tetradentate Schiff base ligands were synthesized by the reaction of 3,4-diaminobenzophenone with salicylaldehyde derivatives, such as [N,N?-bis(4-methoxysalicylaldehyde)- 3,4-diaminobenzophenone] (L1), [N,N?-bis(5-methoxysalicylaldehyde)- 3,4-diaminobenzophenone] (L2), [N,N?-bis(5-bromosalicylaldehyde)-3,4- diaminobenzophenone] (L3), [N,N?-bis(5-nitrosalicylaldehyde)-3,4- diaminobenzophenone] (L4). Additionally, a tetradentate Schiff base ligand [N,N?-bis(3-methoxysalicylaldehyde)-3,4-diaminobenzophenone] (L5), was synthesized. All the Schiff bases and their Ni(II

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7

Gogoi, Ankur, Anindita Dewan, Geetika Borah, and Utpal Bora. "A palladium salen complex: an efficient catalyst for the Sonogashira reaction at room temperature." New Journal of Chemistry 39, no. 5 (2015): 3341–44. http://dx.doi.org/10.1039/c4nj01822b.

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8

Panja, Anangamohan, Narayan Ch Jana, Sarmistha Adak, et al. "The structure and magnetism of mono- and di-nuclear Ni(ii) complexes derived from {N3O}-donor Schiff base ligands." New Journal of Chemistry 41, no. 8 (2017): 3143–53. http://dx.doi.org/10.1039/c7nj00158d.

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9

Bezaatpour, Abolfazl, Sahar Khatami, and Mandana Amiri. "Development of the catalytic reactivity of an oxo–peroxo Mo(vi) Schiff base complex supported on supermagnetic nanoparticles as a reusable green nanocatalyst for selective epoxidation of olefins." RSC Advances 6, no. 33 (2016): 27452–59. http://dx.doi.org/10.1039/c5ra27751e.

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10

Felicio, Roberto C., Gislaine A. da Silva, Lucinéia F. Ceridorio, and Edward R. Dockal. "Tetradentate Schiff Base Copper(II) Complexes." Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 29, no. 2 (1999): 171–92. http://dx.doi.org/10.1080/00945719909349442.

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11

Zamian, Jos� R., and Edward R. Dockal. "Tetradentate Schiff base oxovanadium(IV) complexes." Transition Metal Chemistry 21, no. 4 (1996): 370–76. http://dx.doi.org/10.1007/bf00139036.

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12

M. Sathya and G. Venkatachalam. "Synthesis, Structural Characterization and Catalytic Activities of Palladium(II) Schiff base Complexes Containing Tetradentate N2O2 & N2S2 Donor Ligands." International Journal For Multidisciplinary Research 04, no. 04 (2022): 417–28. http://dx.doi.org/10.36948/ijfmr.2022.v04i04.045.

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New family of palladium(II) tetradentate complexes of the general formula [Pd(L1-4)] (L1-L3; tetradentate N2O2 donors & L4; tetradentate N2S2 donors) have been synthesized by the reaction of Pd(OAc)2 with tetradentate Schiff base ligands. The palladium(II) complexes were fully characterized by analytical, spectral (FT-IR, UV-Vis, 1H-NMR & 13C-NMR) methods. Further, the new palladium(II) complexes were tested as catalyst for Suzuki-Miyaura and Sonogashira coupling reactions and exhibits very good catalytic activity.

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13

Bhardwaj, Vinita, Lavani Hindocha, SK Ashok Kumar, and Suban K. Sahoo. "An aggregation-induced emissive pyridoxal derived tetradentate Schiff base for the fluorescence turn-off sensing of copper(ii) in an aqueous medium." New Journal of Chemistry 46, no. 7 (2022): 3248–57. http://dx.doi.org/10.1039/d1nj05523b.

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14

Liu, Wen-Long, Yao Lu, Xin-Fang Liu, Yan-Yan Zhang, and Xiao-Ya Hu. "A Cu–Mn complex of a Schiff base containing alanylglycine: hexaaquamanganese(II) bis{[N-(2-oxidobenzylidene)alanylglycinato]cuprate(II)} dodecahydrate." Acta Crystallographica Section E Structure Reports Online 62, no. 5 (2006): m1109—m1111. http://dx.doi.org/10.1107/s1600536806013997.

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In the title compound, [Mn(H2O)6][Cu(C12H11N2O4)]2·12H2O, the Cu atom has a square-planar coordination with two N and two O atoms of the tetradentate Schiff base ligand. The centrosymmetric cation [Mn(H2O)6]2+ and anion [CuL]− (L is a Schiff base derived from alanylglycine and salicylaldehyde) occupy a stacking structure within well separated columns along the c axis.

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15

Ourari, Ali, Wassila Derafa, and Djouhra Aggoun. "A novel copper(ii) complex with an unsymmetrical tridentate-Schiff base: synthesis, crystal structure, electrochemical, morphological and electrocatalytic behaviors toward electroreduction of alkyl and aryl halides." RSC Advances 5, no. 101 (2015): 82894–905. http://dx.doi.org/10.1039/c5ra10819e.

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16

ANUAR, SITI KAUTSAR, SITI KAMILAH CHE SOH, and HAFIZA MOHAMED ZUKI. "SYNTHESIS, CHARACTERISATION AND FLUORESCENCE SENSING PROPERTIES OF TETRADENTATE N,N’–BIS(SALICYLIDENE)–1,3-PROPANEDIAMINE FOR METAL IONS DETECTION: PRELIMINARY STUDY." Universiti Malaysia Terengganu Journal of Undergraduate Research 3, no. 3 (2021): 177–82. http://dx.doi.org/10.46754/umtjur.v3i3.229.

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Tetradentate Schiff base ligand namely N,N’–bis(salicylidene)-1,3-propanediamine, containing -ONNO- donor set was successfully synthesised between salicylaldehyde and 1,3-diaminopropane using condensation reaction. The structure of the synthesised ligand was unambiguously determined by Fourier Transform Infrared (FTIR) spectroscopy, Nuclear Magnetic Resonance (NMR) spectroscopy and Thermogravimetric Analysis (TGA). The spectroscopic studies suggest that the central azomethine (C=N) group of tetradentate ligand can be assigned at vibration peak 1632 cm-1 and the chemical shift observed for OH p

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17

López-Gastélum, Karla-Alejandra, Enrique F. Velázquez-Contreras, Juventino J. García, et al. "Mononuclear and Tetranuclear Copper(II) Complexes Bearing Amino Acid Schiff Base Ligands: Structural Characterization and Catalytic Applications." Molecules 26, no. 23 (2021): 7301. http://dx.doi.org/10.3390/molecules26237301.

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Two new glycine-Schiff base copper(II) complexes were synthesized. Single crystal X-ray diffraction (SCXRD) allowed us to establish the structure of both complexes in the solid state. The glycine-Schiff base copper(II) complex derived from 2′-hydroxy-5′-nitroacetophenone showed a mononuclear hydrated structure, in which the Schiff base acted as a tridentate ligand, and the glycine-Schiff base copper(II) complex derived from 2′-hydroxy-5′-methylacetophenone showed a less common tetranuclear anhydrous metallocyclic structure, in which the Schiff base acted as a tetradentate ligand. In both compo

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18

Khan, Shamshad Ahmad, Kamlesh Kumar Singh, and Jahan Ara Khatoon. "Synthesis, characterization and microbiological screening of some transition metal complexes with nitrogen containing macrocyclic ligand." Research Journal of Chemistry and Environment 27, no. 2 (2023): 30–34. http://dx.doi.org/10.25303/2702rjce030034.

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A novel macrocyclic Schiff base ligand 1,4,8,11-tetraaza-2,3,9,10-tetramethyl cyclotetradeca-1,3,8,10-tetraene was synthesized by condensation between butane-2,3-dione and propane-1,3-diamine in an alcoholic medium. The complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Schiff base have been prepared from metal salts in an alcoholic medium. The synthesized Schiff base and its metal complexes are characterized by elemental analysis, molar conductance measurements, magnetic susceptibility, FTIR and electronic absorption spectral data. The higher molar conductance values of these metal complexes

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19

Datta, Amitabha, Kuheli Das, Sandeep B. Mane, et al. "A rare doubly nitrato and phenoxido bridged trimetallic CuII complex: EPR, antiferromagnetic coupling and theoretical rationalization." RSC Advances 6, no. 60 (2016): 54856–65. http://dx.doi.org/10.1039/c6ra10674a.

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A new homometallic trinuclear Cu(ii) complex is afforded with a tetradentate Schiff base precursor. Complex 1 manifests a strong antiferromagnetic coupling which is in agreement with EPR and DFT computation to explain the magneto-structural correlation.

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20

Chohan, Zahid H., M. A. Farooq, and Claudiu T. Supuran. "Copper (II) Acylhydrazinates. Their Synthesis and Characterization." Metal-Based Drugs 8, no. 3 (2001): 171–77. http://dx.doi.org/10.1155/mbd.2001.171.

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Acylhydrazine derived furanyl and thienyl Schiff bases and their Cu(II) complexes have been prepared and characterized on the basis of their physical, spectral and analytical data. The preferred enolic form of the Schiff base function as a tetradentate ligand during coordination to the metal ion yielding a square planar complex. The Schiff bases and their complexes with different anions were tested for their antibacterial activity against bacterial species such as Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa andKlebsiella pneumonae.

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21

Mondal, Ipsita, Antonio Frontera, and Shouvik Chattopadhyay. "On the importance of RH3C⋯N tetrel bonding interactions in the solid state of a dinuclear zinc complex with a tetradentate Schiff base ligand." CrystEngComm 23, no. 18 (2021): 3391–97. http://dx.doi.org/10.1039/d0ce01864c.

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The tetrel bonding and π-stacking interactions in a new dinuclear zinc complex using a tetradentate N<sub>2</sub>O<sub>2</sub> donor Schiff base have been analysed energetically using DFT calculations and several computational tools.

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22

Sreenivas, V., G. Srikanth, Ch Vinutha, M. Shailaja, P. Muralidhar Reddy, and Ravinder Vadde. "Synthesis, Spectral Characterization and Antimicrobial Studies of Co(II) Complexes with Tetradentate Schiff bases Derived from Ortho-Phthalaldehyde." JOURNAL OF ADVANCES IN CHEMISTRY 9, no. 1 (2016): 1873–82. http://dx.doi.org/10.24297/jac.v9i1.2852.

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A series of cobalt (II) complexes have been synthesized with Schiff bases derived from ortho-phthalaldehyde and various amines in aqueous methanol solution. The newly synthesized Schiff bases and their Co (II) complexes have been characterized by elemental analysis, magnetic susceptibility, thermal, conductance measurements, mass, IR, electronic, 1H,13C-NMR spectral techniques. These ligands act as tetradentate species and coordinate to the metal center through the different potential donor atoms such as N, O and S. The probable octahedral structures have been assigned to these complexes. All

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23

Kassim, Karimah, and Muhamad Azwan Hamali. "Green Synthesis and Antimicrobial Studies of Ni(II) and Zn(II) Dinuclear Schiff Base Complexes." International Journal of Engineering & Technology 7, no. 3.11 (2018): 237. http://dx.doi.org/10.14419/ijet.v7i3.11.16016.

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A series of tetradentate Zn(II) and Ni(II) Schiff base complexes derived from N,N-Bis-(2-hydroxyl-5-methoxybenzaldehyde)-m-phenylenediamine was synthesized using microwave assisted synthesis approach for 5-15 minutes. The confirmation of the ligand as well the respective complexes has been elucidated through physiochemical and spectroscopy analyses. The studies show that two metal ions formed bridges connecting two Schiff base ligands. The nitrogen and oxygen atoms in each ligand served as coordination sites for the metal ions. The Schiff base ligand and complexes were screened for antimicrobi

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24

Li, Lei, and Suyuan Zeng. "6,6′-Diethoxy-2,2′-[4-methyl-1,2-phenylenebis(nitrilomethanylylidene)]diphenol acetonitrile monosolvate." Acta Crystallographica Section E Structure Reports Online 69, no. 11 (2013): o1714. http://dx.doi.org/10.1107/s1600536813028845.

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The title solvated Schiff base compound, C25H26N2O4·CH3CN, possesses an O2N2donor set affording a potentially tetradentate metal complex ligand. The central ring makes dihedral angles of 6.7 (3) and 48.4 (2)° with the pendant rings. Intramolecular N—H...O hydrogen-bonding interactions are observed.

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25

Savchuk, Mariia, Steven Vertueux, Thomas Cauchy, et al. "Schiff-base [4]helicene Zn(ii) complexes as chiral emitters." Dalton Transactions 50, no. 30 (2021): 10533–39. http://dx.doi.org/10.1039/d1dt01752g.

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26

McInnes, Jacqueline M., Daniel Swallow, Alexander J. Blake, and Philip Mountford. "Titanium Imido Complexes with Tetradentate Schiff Base Ligands." Inorganic Chemistry 37, no. 23 (1998): 5970–77. http://dx.doi.org/10.1021/ic9806986.

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27

Wagh, Shaila, and B. R. Patil. "SYNTHESIS, SPECTRAL, THERMAL AND ANTIMICROBIAL STUDIES OF NEW METAL COMPLEXES OF SUBSTITUTED HYDROXY PROPIOPHENONE." RASAYAN Journal of Chemistry 15, no. 03 (2022): 1718–27. http://dx.doi.org/10.31788/rjc.2022.1536355.

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A new series of metal complexes of innovative bisketimines (L1 - L5) have been synthesized. Schiff base ligands were synthesized by condensing substituted 2’- hydroxy propiophenone and ethylene diamine. The synthesized Schiff bases act as tetradentate ligands with two nitrogen and two phenolic oxygen groups and co-ordinates with Co (II), Ni (II), Cu (II) and Zn (II) salts. Ligands and their metal complexes have been studied using 1H NMR, IR, UV-Vis and thermogravimetric techniques. The complexes were crystalline, according to the XRD pattern. The thermogravimetric data revealed the thermal sta

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28

Rusanova, Julia A., та Dmytro Bederak. "Crystal structure of bis(μ2-4-bromo-2-[({2-[({2-[(5-bromo-2-oxidobenzylidene)amino]ethyl}sulfanyl)sulfonyl]ethyl}imino)methyl]phenolato)dicopper(II) dimethylformamide disolvate". Acta Crystallographica Section E Crystallographic Communications 73, № 11 (2017): 1797–800. http://dx.doi.org/10.1107/s2056989017015584.

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The title dinuclear copper(II) complex [Cu2(C18H16Br2N2O4S2)2] was prepared by direct synthesis of a dianionic Schiff base derived from 5-bromosalicylaldehyde and cysteamine. The discrete molecules lie across inversion centers and crystallize with two dimethylformamide (DMF) molecules of crystallization. The unique CuIIion is four-coordinated by two tetradentate Schiff base ligands in a distorted square-planar N2O2environment. In the crystal, short intermolecular S...Br contacts, weak C—H...O hydrogen bonds and intra- and intermolecular π–π stacking interactions between rings of the ligand lin

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29

Eltayeb, Naser Eltaher, Siang Guan Teoh, Suchada Chantrapromma, Hoong-Kun Fun та Kamarulazizi Ibrahim. "Aqua{5,5′-dihydroxy-2,2′-[1,2-phenylenebis(nitrilomethylidyne)]diphenolato-κ4 O,N,N′,O′}zinc(II) trihydrate". Acta Crystallographica Section E Structure Reports Online 63, № 11 (2007): m2838—m2839. http://dx.doi.org/10.1107/s1600536807052713.

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In the title complex, [Zn(C20H14N2O4)(H2O)]·3H2O, the ZnII center is in an approximately square-pyramidal coordination environment with the two N and two O atoms of the tetradentate Schiff base ligand forming the basal plane and the coordinated water molecule in the apical position. Three solvent water molecules complete the asymmetric unit. The dihedral angles between the two outer benzene rings of the Schiff base and the central benzene ring are 12.64 (14) and 17.25 (14)°. In the crystal structure, intermolecular O—H...O hydrogen bonds link the molecules into sheets parallel to the ab plane.

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30

Nguyen, Duc-Trung, Tue Ngoc Nguyen, and Tien Van Pham. "Density Functional Theory Investigation of EPR Parameters for of Mn(II), Fe(II), Co(II) and Cd(II) complexes based on a tetradentate ONNO donor Schiff base ligand." Vietnam Journal of Catalysis and Adsorption 12, no. 1 (2023): 49–53. http://dx.doi.org/10.51316/jca.2023.008.

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Characterization of a tetradentate ONNO Schiff base ligand namely (1, 1′- (pyridine-2, 3-dimethyliminomethyl) naphthalene-2, 2′-diol) and hereafter denotes as “SL″ and selected metal complexes including Mn(II), Fe(II), Co(II) and Cd(II) as a central metal was studied.In this paper, the calculation was done to determine the magnetic exchange of the studied molecules, Schiff base complexes via DFT calculations. Using the ZORA approach with the BP86 functionals and appropriate basis set def2-tzvp and Coulomb fitting, the optimized geometries were obtained with reliable accuracy and precision.The

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31

Prabhakaran, B., N. Santhi, and M. Emayavaramban. "Synthesis and Spectral Studies of Ru(II) Carbonyl Schiff Base Complexes." International Letters of Chemistry, Physics and Astronomy 8 (September 2013): 53–66. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.8.53.

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The synthesis and characterization of hexa co-ordinated ruthenium(II) complexes of the type [Ru(CO)(B)(L)] (where B = PPh3, AsPh3, py or pip and L = dibasic tetradentate Schiff base ligand) were synthesized from the reaction of [RuHCl(CO)(B)(EPh3)2] (where E = P, B = PPh3, py or pip, E = As, B = AsPh3)with different tetradentate ligands. The ligands were derived by the condensation of 5-chloro-4-methyl-2-hydroxy benzophenone with ethylenediamine, propylenediamine and o-phenylene-diamine in 1:1 molar ratio. All the compounds have been characterized by elemental analysis and spectral (FT-IR, UV-

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32

Prabhakaran, B., N. Santhi, and M. Emayavaramban. "Synthesis and Spectral Studies of Ru(II) Carbonyl Schiff Base Complexes." International Letters of Chemistry, Physics and Astronomy 8 (February 19, 2013): 53–66. http://dx.doi.org/10.56431/p-a8zib2.

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The synthesis and characterization of hexa co-ordinated ruthenium(II) complexes of the type [Ru(CO)(B)(L)] (where B = PPh3, AsPh3, py or pip and L = dibasic tetradentate Schiff base ligand) were synthesized from the reaction of [RuHCl(CO)(B)(EPh3)2] (where E = P, B = PPh3, py or pip, E = As, B = AsPh3)with different tetradentate ligands. The ligands were derived by the condensation of 5-chloro-4-methyl-2-hydroxy benzophenone with ethylenediamine, propylenediamine and o-phenylene-diamine in 1:1 molar ratio. All the compounds have been characterized by elemental analysis and spectral (FT-IR, UV-

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33

Radoske, Thomas, Roger Kloditz, Sebastian Fichter, et al. "Systematic comparison of the structure of homoleptic tetradentate N2O2-type Schiff base complexes of tetravalent f-elements (M(iv) = Ce, Th, U, Np, and Pu) in solid state and in solution." Dalton Transactions 49, no. 48 (2020): 17559–70. http://dx.doi.org/10.1039/d0dt03405c.

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Tetradentate N<sub>2</sub>O<sub>2</sub>-type Schiff base complexes with tetravalent 4f- and 5f-block metals, [M(salpn)<sub>2</sub>] (H<sub>2</sub>salpn = N,N′-disalicylidene-1,3-diaminopropane; M = Ce, Th, U, Np, and Pu), were characterised both in the solid state and in solution.

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34

Shekhar, Srivastava, Kalam Abul, and Kishor Sahu Nand. "Synthesis of phenylthallium(III) dichloride and diphenylthallium(III) chloride complexes with tetradentate Schiff base ligands : a photoelectron spectroscopic study." Journal of Indian Chemical Society Vol. 79, Jun 2002 (2002): 527–28. https://doi.org/10.5281/zenodo.5843719.

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Department of Chemistry, Allahabad University, Allahabad-211 002, India <em>E-mail</em> : shekharsril @rediffmail.com kalam_abul @rediffmail.com <em>Manuscript received 24 September 2001, accepted 28 December 2001</em> In continuation of our study<sup>1</sup>, we now report some tetradentate Schiff base complexes with phenylthallium(III) dichloride and diphenylthallium(III) chloride.

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35

RAJIB, LAL DE, and KUMAR BHAR SANJIB. "Mixed-ligand Complexes of Cobalt(III) with Dimethylglyoxime." Journal of Indian Chemical Society Vol. 71, May 1994 (1994): 245–48. https://doi.org/10.5281/zenodo.5894738.

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Department ot Chemistry, lnorganic Chemistry Section, Jadavpur University, Calcutta-700 032 <em>Manuscript received 9 February 1993, revised 17 June 1993, accepted 23 June 1993</em> Mixed-ligand complexes of cobalt(III) of the types [Co(SBx)(DMGH)] and [Co(SBy)(DMGH)], where SBx = dianion of tetradentate Schiff base; SBy = monoanion of bidentate Schiff base; DMGH = monoanion of dimethylglyoxime, were isolated from the reaction of alcoholic suspension of cobalt(III) dimethylglyoximate dihydrate with Schiff bases in 1 : 1 and 1 : 2 molar ratios for SBx and SHy respectively. Further mixed-ligand

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36

Matozzo, Paola, Alessia Colombo, Claudia Dragonetti, et al. "A Chiral Bis(salicylaldiminato)zinc(II) Complex with Second-Order Nonlinear Optical and Luminescent Properties in Solution." Inorganics 8, no. 4 (2020): 25. http://dx.doi.org/10.3390/inorganics8040025.

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Whereas there is an increasing amount of reports on the second-order nonlinear optical (NLO) and luminescence properties of tetradentate [N2O2] Schiff base–zinc complexes, the study of zinc complexes having two bidentate [NO] Schiff-base ligands is relatively unexplored from an NLO point of view. This work puts in evidence that the known chiral bis{2-[(R)-(+)-1-phenylethyliminomethyl]phenolato-N,O}zinc(II) complex is a fascinating multifunctional molecular inorganic–organic hybrid material characterized by interesting second-order NLO and luminescent properties in solution. The emissive proper

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37

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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38

Biswas, Arpita. "A Brief Review on Homo-/Hetero-nuclear Co-ordination Compounds Derived from Some Single Compartmentl Acyclic Schiff Base Ligands having N-,O-Donor Centres." Oriental Journal Of Chemistry 38, no. 4 (2022): 957–66. http://dx.doi.org/10.13005/ojc/380417.

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Tetradentate acyclic compartmental Schiff base ligand with N2O2 compartment afford suitable coordination environment for large variety of metal ions. This type of ligands can easily be synthesized by [2+1] condensation of a carbonyl compounds with a diamine. Several metal complexes have been reported from the single- and double-compartment acyclic Schiff base ligands which are the [2+1] condensation products of salicylaldehyde, 2-hydroxyacetophenone, 3-methoxysalicylaldehyde, 3-ethoxysalicylaldehyde and a diamine; The diamine counterpart in these ligands are ethylenediamine, 1,3-diaminopropane

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39

Sarjanović, Josipa, Martina Stojić, Mirta Rubčić, Luka Pavić, and Jana Pisk. "Impedance Spectroscopy as a Powerful Tool for Researching Molybdenum-Based Materials with Schiff Base Hydrazones." Materials 16, no. 3 (2023): 1064. http://dx.doi.org/10.3390/ma16031064.

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Molybdenum coordination complexes are widely applied due to their biological and pharmacological potential, as well as their performance in different catalytic processes. Parent dioxidomolybdenum Schiff base complexes were prepared via the reaction of [MoO2(acac)2] with a hydrazone Schiff-base tetradentate ligand. A new hydrazone-Schiff base (H2L1 and 2) and its corresponding mononuclear and polynuclear dioxidomolybdenum(VI) complex were synthesized and characterized by spectroscopic methods and elemental analyses, and their thermal behavior was investigated by thermogravimetry. The crystal an

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40

Parekh, H. M., P. K. Panchal, and M. N. Patel. "Transition metal(II) ions with dinegative tetradentate schiff base." Journal of Thermal Analysis and Calorimetry 86, no. 3 (2006): 803–7. http://dx.doi.org/10.1007/s10973-005-7284-5.

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Ambrozini, Beatriz, Edward Ralph Dockal, and Éder Tadeu Gomes Cavalheiro. "Thermal behavior of tetradentate Schiff base chromium(III) complexes." Journal of Thermal Analysis and Calorimetry 115, no. 2 (2013): 979–86. http://dx.doi.org/10.1007/s10973-013-3477-5.

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42

Lincoln, Abraham, Srinath Boinapalli, and A. Anil Kumar. "Synthesis, Spectral Characterization and Antibacterial Investigation of Ni(II) Coordination Complexes of Macrocyclic Schiff base ligands Derived from 4-Aminoantipyrine." JOURNAL OF ADVANCES IN CHEMISTRY 13, no. 1 (2017): 5948–58. http://dx.doi.org/10.24297/jac.v13i12.6124.

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A series of Ni(II) complexes (NiL1-NiL5) have been synthesized from macrocyclic Schiff base ligands (L1-L5) were obtained from condensation of 4-aminoantipyrine derivative (L) with different diamines and hydrazides. All these compounds were well characterized by elemental, spectral analysis(mass, IR, 1H-NMR, electronic), magnetic suseceptibility, molar conductance and thermal studies. Macrocyclic Schiff bases are tetradentate with N4 donor system around the metal ion.Octahedral geometry have been assigned for all complexes. All ligands and complexes were examined for antibacterial activity and

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43

Siraj, I. T., and B. U. Sambo. "Synthesis, characterization and antimicrobial activities of schiff base derived from thiourea and anisaldehyde and its Mn(II), Fe (II) and Co(II) complexes." Bayero Journal of Pure and Applied Sciences 11, no. 1 (2018): 20–24. http://dx.doi.org/10.4314/bajopas.v11i1.4.

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Complexes of Mn(II), Fe(II) and Co(II) with a Schiff base derived from condensation reaction of thiourea and o-anisaldehyde has been synthesized and characterized analytically and spectroscopically. Melting point of the Schiff base was found to be 160°C and the complexes decomposed within a temperature range of 215 to 275°C. Molarconductances of the complexes were found to be within 1.1 to 3.5W–1 cm2 mol–1 range. Magnetic moment indicated the complexes to be paramagnetic (4.03 to 5.71BM). Infrared spectrum of the Schiff base showed the azomethine peak at 1601cm–1 which shifted up to1687cm–1 in

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44

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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45

Kobayashi, Fumiya, Atsushi Koga, Ryo Ohtani, Shinya Hayami, and Masaaki Nakamura. "Crystal structure of [2-({2-[(2-azanidylbenzylidene)amino]benzylidene}amino)-4-chlorophenolato]nickel(II)." Acta Crystallographica Section E Crystallographic Communications 73, no. 4 (2017): 637–39. http://dx.doi.org/10.1107/s2056989017004613.

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The title complex, [Ni(C20H14ClN3O)], with an asymmetrically chloride-appended Schiff base ligand has been synthesized and structurally characterized at 100 K. In the compound, the central nickel(II) ion has a square-planar coordination geometry with N3O donors of the π-conjugated tetradentate Schiff base ligand. In the crystal, the complexes are connected into an inversion dimerviaan Ni...Ni interaction [3.1753 (5) Å] and a pair of π–π interactions [centroid–centroid distance = 3.8416 (16) Å]. The dimers are linkedviaa C—H...Cl hydrogen bond, forming a chain along thec-axis direction. The dim

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Kargar, Hadi, Reza Kia, Amir Adabi Ardakani, and Muhammad Nawaz Tahir. "4,4′,6,6′-Tetrabromo-2,2′-[(E,E)-ethane-1,2-diylbis(nitrilomethanylylidene)]diphenol." Acta Crystallographica Section E Structure Reports Online 68, no. 8 (2012): o2348. http://dx.doi.org/10.1107/s1600536812029832.

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The asymmetric unit of the title compound, C16H12Br4N2O2, comprises half of a potential tetradentate Schiff base ligand. The whole molecule is generated by an inversion center located in the middle of the C—C bond of the ethylene segment. There are intramolecular O—H...N hydrogen bonds makingS(6) ring motifs. In the crystal, no significant intermolecular interactions are observed.

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Bauer, Wolfgang, Tanja Ossiander, and Birgit Weber. "A Promising New Schiff Base-like Ligand for the Synthesis of Octahedral Iron(II) Spin Crossover Complexes." Zeitschrift für Naturforschung B 65, no. 3 (2010): 323–28. http://dx.doi.org/10.1515/znb-2010-0315.

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A new tetradentate Schiff base-like ligand H2L (1) ((E,E)-dimethyl-2,2´-[1,2-phenylenebis(aminomethylidyne)] bis[3-oxobutanoate]) was synthesised and structurally characterised. Its reaction with iron(II) acetate leads to the formation of the octahedral N2O4-coordinated complex [FeL(MeOH)2] (2). The complex is a pure high-spin (HS) compound as is evident from magnetic measurements and X-ray crystallography.

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48

Luo, Hongyan, Shuang Liu, Steven J. Rettig, and Chris Orvig. "Rhenium and technetium complexes from pentadentate (N3O2) and tetradentate (N2O2) Schiff base ligands." Canadian Journal of Chemistry 73, no. 12 (1995): 2272–81. http://dx.doi.org/10.1139/v95-281.

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The rhenium(V) and technetium(V) complexes: [ReO(apa)], [{ReO(epa)}2O], and [TcOCl(epa)] have been prepared from a potentially pentadentate N3O2 ligand, N,N′-3-azapentane-1,5-diylbis(3-(1-iminoethyl)-6-methyl-2H-pyran-2,4(3H)-dione) (H3apa), or a potentially tetradentate N2O2 ligand, N,N′-ethylene-diylbis(3-(1-iminoethyl)-6-methyl-2H-pyran-2,4(3H)-dione) (H2epa). The N2O2 complexes were synthesized in low yields. There was also evidence indicating that H2ppa, N,N′-propylene-diylbis(3-(1-iminoethyl)-6-methyl-2H-pyran-2,4(3H)-dione), hydrolyzed in the course of coordination, forms a rhenium comp

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49

Cheng, Jian-Ping, Qiu-Yue Lin, Hu Rui-Ding, Wen-Zhong Zhu, Hua-Qiong Li, and Dong-Hang Wang. "Synthesis, DNA interaction and antibacterial activities of La(III) and Gd(III) complexes of Schiff base derived from o-vanillin and lysine." Open Chemistry 7, no. 1 (2009): 105–10. http://dx.doi.org/10.2478/s11532-008-0096-2.

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AbstractTwo novel complexes, [La(HL)(H2O)2NO3] · NO3 · H2O and [Gd(HL)(H2O)2NO3] · NO3 · H2O, where HL is a Schiff base derived from o-vanillin and lysine, have been synthesized and characterized by elemental analysis, conductivity measurements, IR, 1H NMR and thermogravimetric analyses (TGA). The Schiff base ligand behaves as a tetradentate, coordinating through azomethine nitrogen, phenolic oxygen and two carboxylic oxygen atoms. The interaction of these complexes with calf thymus DNA (CT-DNA) was also investigated by spectrometric titration and viscometric measurements. The faint hypochromi

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50

Siraj, I. T., and M. Sule. "Synthesis, characterisation and antimicrobial activities of mixed ligand complexes of Mn (II), Fe (II) and Co(II) containing N,N'-bis (o-anisaldehyde) p-phenylenediamine (tetradentate schiff base) and gylcine." Bayero Journal of Pure and Applied Sciences 11, no. 1 (2018): 32–36. http://dx.doi.org/10.4314/bajopas.v11i1.6.

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Complexes of Mn(II), Fe(II) and Co(II) containing N, N’-bis[o-anisaldehyde]p-phenylenediamine tetradentate Schiff base as primary ligand and glycine as secondary bidentate ligand have been synthesized by reflux in 1:1:1 mole ratio and characterized both analytically and spectroscopically. Molar conductance measurement (69.02 to 86.30Ω–1 cm2 mol–1) of the complexes indicated they are weak electrolyte and magnetic susceptibility measurement shows values in range of 4.53 to 5.59BM indicating their paramagnetism. The infrared data suggested that the Schiff base coordinated via the two nitrogen ato

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