Complexes of 3dn Metal Ions with Thiosemicarbazones: Synthesis and Antimicrobial Activity (original) (raw)
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Molecules
Herein, we report the synthesis of eight new mononuclear and binuclear Co2+, Ni2+, Cu2+, and Zn2+ methoxy thiosemicarbazone (MTSC) complexes aiming at obtaining thiosemicarbazone complex with potent biological activity. The structure of the MTSC ligand and its metal complexes was fully characterized by elemental analysis, spectroscopic techniques (NMR, FTIR, UV-Vis), molar conductivity, thermogravimetric analysis (TG), and thermal differential analysis (DrTGA). The spectral and analytical data revealed that the obtained thiosemicarbazone-metal complexes have octahedral geometry around the metal center, except for the Zn2+-thiosemicarbazone complexes, which showed a tetrahedral geometry. The antibacterial and antifungal activities of the MTSC ligand and its (Co2+, Ni2+, Cu2+, and Zn2+) metal complexes were also investigated. Interestingly, the antibacterial activity of MTSC- metal complexes against examined bacteria was higher than that of the MTSC alone, which indicates that metal c...
Polyhedron, 2006
Reaction of 2-benzoylpyridine N(4)-phenyl thiosemicarbazone (HL) with a variety of copper salts yielded a series of copper(II) complexes of the type [CuLX] where X = Cl (1), Br (2), NO 3 (3), NCS (4), N 3 (5) excluding the perchlorate complex. In the perchlorate complex (6), one molecule each of the neutral and deprotonated ligand is found to be coordinated to the metal. The complexes are characterized by molar conductivity measurements, magnetic studies, electronic, infrared and EPR spectral studies. The crystal structures of two copper complexes, 1 and 4 have been resolved using single crystal X-ray studies. The crystal structure of compound 1 revealed chlorine bridged dimer having monoclinic lattice with space group symmetry P2 1 /c. The compound 4 adopts a distorted square planar geometry with N 3 S core as the base. The antimicrobial activity of the ligand and the copper complexes were tested against five types of bacteria isolated from clinical samples. The ligand (HL) was found to be active against Staphylococcus aureus. The copper(II) complexes were found to be active against Vibrio cholerae O1 and Salmonella paratyphi.
Research Journal of Applied Biotechnology
Novel complex of Cu(I) of ligand 2-(Anilinoacetyl)-N-phenylhydrazine-1-carbothioamide (H2L) has been synthesized and characterized by 1 HNMR, IR, elemental analyses, molar conductance, UVvisible spectra, magnetic susceptibility measurements and thermogravimetric analysis (TGA/DTG). The result confirmed that the ligand behaved as neutral bidentate, coordination take place via carbonyl oxygen(C=O) and N(2)H groups. Copper complex is more thermally stable than free ligand. Copper(I) complexes is mononuclear, adopt octahedral geometry. The ligand and complex have been tested for their inhibitory effect on the growth of bacteria against gram-positive (Streptococcus pyogenes) and gram-negative (Escherichia coli). The results proved that the copper complex has less potent antibacterial as compared to the ligand.
Journal of Scientific Research, 2023
Thiosemicarbazones are class of compounds which are obtained by the condensation of thiosemicarbazide with carbonyl compounds. The transition metal complexes of thiosemicarbazones are widely considered due to their broad spectrum of biological activities such as antibacterial, antitumor and antifungal activities. In present research work a series of four novel Cu(II) aryl thiosemicarbazones complexes having the general composition [Cu(L 1) 2 Cl 2 ], [Cu(L 2) 2 Cl 2 ], [Cu(L 3) 2 Cl 2 ] and [Cu(L 4) 2 Cl 2 ]{where L 1 = 4nitroacetophenone thiosemicarbazones (4NAT), L 2 = 3-nitrobenzaldehyde thiosemicarbazone (3NBT), L 3 = 4-hydroxybenzaldehyde thiosemicarbazone (4HBT) and L 4 = 4-aminoacetophenone thiosemicarbazone (4AAT)} have been synthesized by the reaction of thiosemicarbazide with substituted aromatic aldehydes and ketones by conventional heating as well as microwave irradiations method followed by complexation with Cu(II) metal. The synthesized compounds have been characterised by elemental analysis, melting point determination, FTIR, UV-visible spectral analysis. Thiosemicarbazone ligands behave as bidentate ligand and forms octahedral complexes with Cu(II). The synthesized ligands and their new metal complexes have been screened in vitro for antibacterial activity against Escherichia coli, Staphylococcus aureus and Bacillus subtilis bacteria. The result shows that all the Cu(II) complexes are potent antibacterial agents against these bacteria.
Bioinorganic Chemistry and Applications, 2007
The reactions of (η 5 -C 5 H 5 ) 2 MCl 2 (M = Ti, Zr, or Hf) with mercaptoazoles (LH 2 ), namely, bis(mercaptotriazoles), bis(mercaptooxadiazoles), and bis(mercaptothiadiazoles) in 2 : 1 molar ratio, respectively, have been studied in dry tetrahydrofuran in the presence of n-butylamine and the binuclear complexes of the type [{(η-C 5 H 5 ) 2 M} 2 (L)] (M = Ti/Zr/Hf) are obtained. Tentative structural conclusions are drawn for the reaction products based upon elemental analysis, electrical conductance, magnetic moment, and spectral data (UV-Vis, IR, 1 H NMR, and 13 C NMR). FAB-mass spectra of few complexes of each series were also carried out to confirm the binuclear structures. Studies were conducted to assess the growth-inhibiting potential of the complexes synthesized, and the ligands against various fungal and bacterial strains.
Chinese Journal of Chemistry, 2007
4-Morpholinoacetophenone thiosemicarbazone, MAPT, and its nickel(II) and copper(II) complexes have been prepared and characterized by elemental analysis, magnetic susceptibility, spectral methods (FT-IR, 1H NMR) and cyclic voltammetry. Electrochemical behaviors of the complexes have been studied by cyclic voltammetry in DMF media showing metal centered reduction processes for both of them. The redox properties, nature of the electrode processes and the stability of the complexes were discussed. [Cu(MAPT)2]Cl2 complex shows Cu(II)/Cu(I) couple and quasi-reversible wave associated with the Cu(III)/Cu(II) process. The reduction/oxidation potential values depend on the structures of complexes. Also, the antimicrobial activities of these complexes were determined against S. aureus, E. coli and B. subtilis.
Benzofurane and naphthofuranethiosemicarbazone ligands 2a (L 1) and 2b(L 2) and their Cu(II), Co(II), Ni(II), and Pd(II) complexes have been synthesized and characterized by elemental analyses, molar conductance, magnetic susceptibility measurements, IR, NMR, and electronic spectral studies. IR spectra show that the ligands is coordinated to the metal ions in a didentate manner with N,S doner sites. In the presence of tow thiosemicarbazones ligands 2a(L 1) and 2b(L 2), the corrosion resistance of cast iron in 10.M H 2 SO 4 increases in the order, 2b(L 2) >2a(L 1). The effect of studied ligands inhibits the corrosion of cast iron extent depending on the structure and high donation of π-electron present inhibitor. Co(II) and Pd (II) complexes possess higher antimicrobial activity than free ligands and other complexes. The [L 1 Pd Cl 2 ]H 2 O complexe shows higher IC50 value of 4.6 µg/ml toward human breast cancer cell lines (MCF-7). For other complexes,
Scholars international journal of chemistry and material sciences, 2023
The New ligand 5-methyl-2-(2-thienyl)-1,3-oxazole-4-carbaldehyde thiosemicarbazone (HL)(1) was synthesized. This ligand reacted with Co(II) and Ni(II) chloride in ratio 1:2 metal:ligand afforded two complexes, [Co(LH)]Cl 2 (2) and [Ni(HL) 2 ]Cl 2 (3). The ligand and its metal (II) complexes have been characterized by spectroscopic techniques. The Xray structural studies revealed that the free ligand exist in thione form and remain as neutral tridentate with NNS donor atoms in the tow complexes beside presence of uncoordinated chloride ions in the cavities of the crystal lattice of the complexes. One of these chlorides in complex (2) is hydrogen bonded to a proton of the amine of the ligand. While in complex (3) the chloride bonded to proton of imine (-N 2 H) of the ligand and the coordination environment has a distorted octahedral. The oxazole N and S atoms in the two complexes are cis to each other whereas the azomethine N atoms are trans coordinated. The ligand and its metal complexes were tested for their in vitro biological activity against six standard microorganisms: two Gram positive namely Bacillus subtilis and Micrococcus luteus, and one Gram negative bacteria Escherichia coli and three fungi: Saccharomyces cerevisiae (Baker's yeast), Mucor spec., and Aspergillus niger, at a concentration 100µg/ml.
Molecules
Four new complexes (Ni2+, Cu2+, Ag+, and Hg2+) were prepared from the ligand N-(4-chlorophenyl)-2-(phenylglycyl)hydrazine-1-carbothioamide (H2L). Analytical and spectroscopic techniques were used to clarify the structural composition of the new chelates. In addition, all chelates were tested against bacterial strains and the HepG2 cell line to determine their antiseptic and carcinogenic properties. The Ni(II) complex was preferable to the other chelates. Molecular optimization revealed that H2L had the highest reactivity, followed by Hg-chelate, Ag-chelate, Ni-chelate, and Cu-chelate. Moreover, molecular docking was investigated against two different proteins: the ribosyltransferase enzyme (code: 3GEY) and the EGFR tyrosine kinase receptor (code: 1m17).