Characterization of Ni(II) and Cd(II) Metal Complexes using Schiff Base Ligand derived from 2-Thiophenecarboxyldehyde and 2 Aminothiophenol (original) (raw)
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Inorganica Chimica Acta, 2014
A new imidazole-based Schiff base, 2-((1H-imidazol-4-yl)methyleneamino)phenol and dichlorobis(2-((1H-imidazol-4-yl)methyleneamino)-phenol)metal(II) complexes (M: Ni, Cd) [Ni(H 2 L) 2 Cl 2 ] (1) and [Cd(H 2 L) 2 Cl 2 ] (2) have been prepared and characterized by X-ray diffraction, Elemental analyses, GC-MS and IR spectroscopy techniques. The structural properties of the title complexes have been further investigated by DFT calculations. The analogous complexes have been found to be configurationally different from each other. With the influences of intermolecular hydrogen bonds, complex 2, in cis configuration has revealed an intriguing structural motifs with large solvent accessible voids that are otherwise absent in trans-configurated complex 1 which consists of the similar types of intermolecular contacts e.g. the similar intermolecular hydrogen bonds and C-HÁ Á Áp interactions. The structural properties of free ligand and the complexes have been significantly rationalized by DFT calculations and the general trends observed in the experimental data have been successfully reproduced by the calculated ones.
2016
Synthesis, structure, and physico-chemical investigation of Ni (II) and Cu (II) complexes derived from Schiff base of 2-aminophenol with terephthaldehyde and then it allowed to react with metal salts with 8-hydroxyquinoline to form binuclear Schiff base mixed ligand metal complexes. All the synthesized ligand and complexes were characterized based on elemental analysis, 1 H NMR ,UV-Visible, molar conductance , FTIR, and thermal analysis (TGA/DTA). Molar conductance of the metal complexes shows that chelates are non electrolytic nature. An IR spectrum shows that the Schiff basses are coordinated with NO donar sites of azomethine nitrogen and phenolic oxygen and qunoline nitrogen and phenolic oxygen of 8-hydroxyquinoline group. Formation of Schiff base ligand was confirmed by 1 H NMR spectra. The electronic spectra show that Ni (II) and Cu (II) complexes have tetrahedral geometry. Thermal stability of complexes was also studied to assess the compatibility of the donating moieties. Sch...
Journal of Solution Chemistry, 2010
The condensation of 2-hydroxybenzaldehyde or 2,4-dihydroxybenzaldehyde with 4,4′-diaminobiphenyl in absolute EtOH in a molar ratio 2:1 gave, respectively, the Schiff base ligands H2L1 or H2L2. The bases served as tetradentate ligands to coordinate CoII, NiII and CdII chlorides, leading to complexes where the metal:ligand ratio is 2:1. All of the compounds were characterized by elemental analysis, infrared, electronic and mass spectroscopy, 1H-n.m.r. and d.s.c. The cyclic voltammograms of the ligands and their complexes in DMF are discussed.
This study highlights synthesis and characterization of a tetradentate ONNO Schiff base ligand namely (1, 1 0-(pyridine-2, 3-dimethyliminomethyl) naphthalene-2, 2 0-diol) and hereafter denotes as " HNDAP 00 and selected metal complexes including Mn(II), Fe(II), Co(II) and Cd(II) as a central metal. HNDAP was synthesized from 1:2 M ratio condensation of 2, 3-diaminopyridine and 2-hydroxy-1-naphthaldhyde, respectively. The stoichiometric ratios of the prepared complexes were estimated using complementary techniques such as; elemental analyses (-C, H, N), FT-IR, magnetic measurements and molar conductivity. Furthermore, their physicochemical studies were carried out using thermal TGA, DTA and kinetic ethermodynamic studies along with DFT calculations. The results of elemental analyses showed that these complexes are present in a 1:1 metal-to-ligand molar ratio. Moreover, the magnetic susceptibil-ities values at room temperature revealed that Mn(II), Fe(II) and Co(II) complexes are paramagnetic in nature and have an octahedral (O h) geometry. In contrast, Cd(II) is diamagnetic and stabilizes in square planar sites. The molar conductivity measurements indicated that all complexes are nonelectrolytes in dimethyl formamide. Spectral data suggested that the ligand is as tetradentate and coordinated with Co(II) ion through two phenolic OH and two azomethine nitrogen. However, for Mn(II), Fe(II) and Cd(II) complexes, the coordination occurred through two phenolic oxygen and two azomethine nitrogen with deprotonation of OH groups. The proposed chemical structures have been validated by quantum mechanics calculations. Antimicrobial activities of both the HNDAP Schiff base ligand and its metal complexes were tested against strains of Gram (-ve) E. coli and Gram (þve) B. subtilis and S. aureus bacteria and C. albicans, A. flavus and T. rubrum fungi. All the prepared compounds showed good results of inhibition against the selected pathogenic microorganisms. The investigated HNDAP Schiff base complexes showed higher activity and stability than their corresponding HNDAP Schiff base ligand and the highest activity observed for Cd(II) complex. Moreover, the prepared Schiff base ligand and its Mn(II) and Co(II) complexes have been evaluated for their anticancer activities against two cancer cell lines namely; colon carcinoma cells (HCT-116 cell line) and hepatocellular carcinoma (Hep-G2) cell lines The interaction of Mn(II) and Co(II) complexes with calf thymus DNA (CT-DNA) was studied by absorption spectroscopic technique and viscosity measurements. Both complexes showed a successful interaction with CT-DNA via intercalation mode.
Journal of Spectroscopy, 2013
Synthesis of zinc(II)/cadmium(II)/mercury(II) thiocyanate and azide complexes of a new bidentate Schiff-base ligand (L) with general formula of MLX2 (M = Zn(II), Cd(II), and Hg(II)) in ethanol solution at room temperature is reported. e ligand and metal complexes were characterized by using ultraviolet-visible (UV-visible), Fourier transform infrared (FT-IR), 1 Hand 13 C-NMR spectroscopy and physical characterization, CHN analysis, and molar conductivity. 1 H-and 13 C-NMR spectra have been studied in DMSO-d6. e reasonable shis of FT-IR and NMR spectral signals of the complexes with respect to the free ligand con�rm well coordination of Schiff-base ligand and anions in an inner sphere coordination space. e conductivity measurements as well as spectral data indicated that the complexes are nonelectrolyte. eoretical optimization on the structure of ligand and its complexes was performed at the Becke's three-parameter hybrid functional (B3) with the nonlocal correlation of Lee-Yang-Parr (LYP) level of theory with double-zeta valence (LANL2DZ) basis set using GAUSSIAN 03 suite of program, and then some theoretical structural parameters such as bond lengths, bond angles, and torsion angles were obtained. Finally, electrochemical behavior of ligand and its complexes was investigated. Cyclic voltammograms of metal complexes showed considerable changes with respect to free ligand.
The meal complexes of Co(II), Ni(II), Cu(II), Cd(II) and Zn(II) derived from hydroxyl benzophenone and o-phenylenediamine have been synthesised and characterized by elemental analysis, 1 H NMR, FT-IR, UV-visible, Mass spectroscopy, molar conductometry, magnetic susceptibility and thermal analysis study. The FT-IR spectral study reveals that the ligand behaves as a dibasic tetradentate ligand with N 2 O 2 donor atoms sequence towards central metal ion. The physico-chemical study reveals octahedral geometry for the complexes. The results show the formation of 2:1(ligand: metal chloride) complexes with amine and screened for anti-inflammatory, antimicrobial, DNA binding properties.During the past two decades, considerable attention has been paid to the chemistry of metal complexes containing nitrogen and other donor 1. The tetradentate Schiff base complexes are well known to form stable complexes, where coordination takes place through the N 2 O 2 donor set 2-4. N, O-bidentate and N 2 O 2-tetradentate ligands (soft and hard donor) possess many, advantages such as facile approach, relative tolerance, readily adjusted ancillary ligands, and tunable steric and electronic coordination environments on the metal center 5. This may be attributed to their potential application in many fields such as oxidation catalysis 6 and electrochemistry 7. Transition metals are involved in many biological processes which are essential to life process. The metals can coordinate with O-or N-terminals from proteins in a variety of models and play a crucial role in the conformation and function of biological macromolecules 8, 9. This paper reports the synthesis, characterization, thermal and biological studies of metal(II) complexes derived from the reaction of hydroxyl benzophenone and o-phenylenediamine in alcohol. Experimental section:-Materials and Methods:-All the chemicals used in the preparation of Schiff base and its metal complexes were of AR grade. A Perkin-Elmer CHN analyzer (model 2400) was used for C, H and N analyses. The room temperature molar conductance was determined using a Century digital conductivity meter (model cc 601) with a dip type cell and a smooth platinum electrode. The electronic absorption spectra of the complexes were recorded as dilute solutions on a Shimadzu 160A/240A UV-visible spectrophotometer. The 1 H NMR spectra were recorded using Bruker DRX 400 spectrometer at 400 MHz with TMS as the internal standard. Mass spectra were obtained with a VG70-70H
DESCRIPTION The condensation reaction between the thiosemicarbozide and carbondisulfide to obtain the 5-Amino-[1,3,4]thiadiazole-2-thiol was carried out in direct reaction between the reactant, two molecules of this product was bridged by dibromoethane formed the precursor, which that reacted with salicylaldehyde to obtained the Schiff base product [H2L], the complexes were formed by adding two mole from metal salts to one mole from ligand. The ligand and their complexes was characterized by [IR, NMR, GC-Mass, UV-Vis] spectroscopies in addition the physical properties, molar conductivity and magnetic susceptibility, mole ratio and thermodynamic studies were measured. The gas chromatography displays the ligand and complexes with highly purity. The molar conductivity, magnetic moments and spectral data suggested the geometry around the central metal are tetrahedral around the nickel ion, square planer around the palladium and platinum ion while the octahedral suggested around the copp...
Polyhedron, 2008
To explore the influence of non-covalent weak force interactions, mainly exerted by carboxylic groups, on the formation of supramolecular architectures of transition metal complexes and their electrical conduction processes, a new symmetrical [N 4 O 2 ] hexadentate Schiff base ligand, 1,8-N-bis(3-carboxy)disalicylidene-3,6-diazaoctane-1,8-diamine, abbreviated to H 4 fsatrien, and its complexes of Ni(II), Cd(II) and Mn(II) have been synthesized using in situ condensation of the ligand components in the presence of metal ions. The complexes were structurally characterized by elemental analyses, IR, UV-Vis, NMR, ESR, molar conductivity and magnetic measurements. The crystal structures of all the complexes have been determined by a single crystal X-ray diffraction study. The 1-D, 2-D and 3-D networks of the complexes are formed by p-p stacking, C-HÁ Á Áp interactions and mono or bifurcated H-bonding. The electronic structures of the complexes have been examined using the DFT method. Solid-state properties (e.g. electrical conductivity at different temperatures and optical properties) of the Ni(II) and Mn(II) complexes have also been studied and, depending on the temperature, the conductivity of the complexes is found to be insulating and semiconducting (intrinsic and extrinsic) in nature. The optical band gap (E gd ) of complexes and is found to be 2.57 and 2.30 eV, respectively.
Polyhedron, 2018
A tridentate NNO donor Schiff base, 2,4-dichlorido-6-((3-(dimethylamino)propylimino)methyl)phenol (HL) and its three complexes [CdL2]•H2O (1), [NiL2] (2) and [NiLL′(DMF)] (3) (HL′ = 3.5-dichlorosalicylaldehyde) were synthesized and physicochemically characterized by means of elemental analysis, molar conductivity measurements, FT-IR, UV-Vis and NMR spectral studies. The molecular structures of all three complexes were confirmed by X-ray crystallography. In all three complexes, the metal ions are in distorted octahedral environments. [CdL2]•H2O (1) crystallized in a triclinic space group, whereas both [NiL2] (2) and [NiLL′(DMF)] (3) crystallized in the monoclinic crystal system. The crystal structures of the complexes exhibit different types of intermolecular interactions, which have been supported by Hirshfeld surface analysis and associated fingerprint plots. The luminescent properties of the Schiff base and the three complexes were studied, and the nature of the emission was found to be quenching.