SYNTHESIS, SPECTRAL STUDIES, STRUCTURAL EVALUATION AND ANTIMICROBIAL ACTIVITY OF SOME NOVEL C R(III) COMPLEXES CONTAINING TETRADENTATE MACROCYCLIC LIGANDS

INDIAN DRUGS ◽  
2017 ◽  
Vol 54 (06) ◽  
pp. 20-29
Author(s):  
S Shukla ◽  
◽  
S. Gautam ◽  
S Chandra ◽  
A. Kumar
Keyword(s):  
Metal Complexes ◽  
Metal Ion ◽  
Metal Salt ◽  
Condensation Reaction ◽  
Macrocyclic Ligand ◽  
Agar Plate ◽  
Macrocyclic Ligands ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Spectral Techniques

A string of novel coordination compounds of Cr(III) complexes have been derived and characterized from the macrocyclic ligands (L 1 -L 2 ) carried out by condensation reaction between ligands and the subsequent metal salt. The chemical composition of ligand was determined by analytical and spectral techniques i.e. elemental analysis, IR and Mass spectrocopy. Spectral techniques revealed tetradentate [N 4 ] the nature of ligand and its coordination mode to metal ion through nitrogen donor atoms. Metal complexes were characterized by elemental analyses, molar conductance, magnetic susceptibility measurements, IR, electronic spectra, ePR studies. The geometry of these complexes was ascertained by molecular modelling study by using Gaussian 09 program. All metal complexes were found to exhibit octahedral geometry around the metal ion. The newly synthesized macrocyclic ligands and metal complexes were subjected for antimicrobial screening to determine the inhibition and control against tested microorganisms, bacteria ( S.lutea , S.aureus, S.albus and E.coli ) and fungi ( A.fulviceps, U . hordei, A. niger and P.catinus ) by using disc diffusion method and agar plate technique, respectively. The experimental results suggest that metal complexes exhibit enhanced inhibition zone than free macrocyclic ligand.

scholarly journals THE METAL COMPLEXES OF NOVEL SCHIFF BASE CONTAINING ISATIN: CHARACTERIZATION, ANTIMICROBIAL, ANTIOXIDANT AND CATALYTIC ACTIVITY STUDY

2019 ◽  
pp. 206-210
Author(s):  
VAIRALAKSHMI M ◽  
PRINCESS R ◽  
JOHNSON RAJA S
Keyword(s):  
Catalytic Activity ◽  
Metal Complexes ◽  
1H Nmr ◽  
Metal Ion ◽  
Analytical Data ◽  
Free Ligand ◽  
Molar Conductance ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Standard Drug

Objectives: The aim of our work was to synthesize novel mixed ligand-metal complexes and evaluation of antimicrobial, antioxidant assay, and analysis of catalytic oxidation of cyclohexane. Methods: The complexes were characterized by means of various physicochemical techniques such as elemental analysis, molar conductance, magnetic susceptibility, infrared (IR), electronic absorption, 1H NMR (proton magnetic resonance), and mass spectral studies. The antimicrobial screening study was done by disc diffusion method. The catalytic activity of the complexes was observed in the oxidation of cyclohexane using eco-friendly hydrogen peroxide as oxidant. Results: On comparing the 1H NMR and IR spectral data of free ligand and its complexes, it was found to be azomethine (CH=N) proton which is formed in the free ligand. During complexation, the azomethine proton is coordinated to the metal ion and the phenolic oxygen is coordinated to the metal ion by deprotonation. The analytical data and mass spectra of the ligand and the complexes confirm the stoichiometry of metal complexes as being of the (MLY)Cl type and the metal to ligand ratio is 1:1. The antimicrobial, antioxidant, and catalytic potential were evaluated and the result shows the better activity of the complexes than the ligand. Conclusion: It was found to be copper(II) and zinc(II) complexes which are effective against all the bacteria when compared to standard drug streptomycin. Copper(II) complex was found to be effective antibacterial agent against Aspergillus niger and Aspergillus flavus in comparison to the standard drug Nystatin. The zinc complex exhibited good catalytic activity.

scholarly journals DESIGN AND SYNTHESIS OF BENZODIAZEPINES BEARING BENZIMIDAZOLE/BENZOTHIAZOLE AND INDOLE MOIETIES AS A POTENT ANTIMICROBIAL AND ANTIOXIDANT AGENTS

2018 ◽  
Vol 11 (1) ◽  
pp. 70 ◽  
Author(s):  
Basavaraj Shivabasappa Naraboli ◽  
Biradar Js
Keyword(s):  
Antimicrobial Activity ◽  
Metal Ion ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Agar Plate ◽  
Biologically Active ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Antioxidant Power ◽  
Antioxidant Agents

  Objective: The present work deals with the synthesis and characterization of biologically active new indole derivatives, namely, 2-((1H-benzo[d] imidazol-2-yl) thio)-N-(4-(4-(1H-indol-3-yl)-8-methyl-1H-benzo[b][1,4]diazepin-2-yl) phenyl) acetamide 3a-d, N-(4-(4-(1H-indol-3-yl)-8-methyl- 1H-benzo[b][1,4]diazepin-2-yl) phenyl)-2-((5-methoxy-1H-benzo[d]imidazol-2-yl) thio) acetamide 4a-d and N-(4-(4-(1H-indol-3-yl)-8-methyl-1H-benzo[b][1,4]diazepin-2-yl) phenyl)-2-(benzo[d]thiazol-2-ylthio) acetamide 5a-d.Methods: All these newly synthesized compounds were screened for their in vitro antimicrobial activity by an agar plate diffusion method, antioxidant activities such as 1,1-diphenyl-2-picrylhydrazyl (DPPH), radical scavenging activity (RSA), ferric ions (Fe3+) reducing antioxidant power (FRAP), and ferrous (Fe2+) metal ion chelating activity.Result: The structures of all the newly synthesized compounds were characterized by their infrared,1H nuclear magnetic resonance, mass spectral studies, and elemental analysis. Compounds 7a and 7b exhibited good RSA at a concentration 100 μg/ml, compounds 6d, 7a-d and 8a-c displayed good FRAP at a concentration 100 μg/ml, compounds 7b-d and 8b-d showed good Fe2+ ion metal chelating activity. Compounds 6b, 6d, 7a-d, and 8a-d exhibited good activity against all the screened bacteria and fungi.Conclusion: Some of the compounds have shown potent antimicrobial activity against all the screened bacteria and fungi, and some have exhibited very good antioxidant activity.

scholarly journals DESIGN AND SYNTHESIS OF BENZODIAZEPINES BEARING BENZIMIDAZOLE/BENZOTHIAZOLE AND INDOLE MOIETIES AS A POTENT ANTIMICROBIAL AND ANTIOXIDANT AGENTS

2018 ◽  
Vol 11 (1) ◽  
pp. 70
Author(s):  
Basavaraj Shivabasappa Naraboli ◽  
Biradar Js
Keyword(s):  
Antimicrobial Activity ◽  
Metal Ion ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Agar Plate ◽  
Biologically Active ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Antioxidant Power ◽  
Antioxidant Agents

  Objective: The present work deals with the synthesis and characterization of biologically active new indole derivatives, namely, 2-((1H-benzo[d] imidazol-2-yl) thio)-N-(4-(4-(1H-indol-3-yl)-8-methyl-1H-benzo[b][1,4]diazepin-2-yl) phenyl) acetamide 3a-d, N-(4-(4-(1H-indol-3-yl)-8-methyl- 1H-benzo[b][1,4]diazepin-2-yl) phenyl)-2-((5-methoxy-1H-benzo[d]imidazol-2-yl) thio) acetamide 4a-d and N-(4-(4-(1H-indol-3-yl)-8-methyl-1H-benzo[b][1,4]diazepin-2-yl) phenyl)-2-(benzo[d]thiazol-2-ylthio) acetamide 5a-d.Methods: All these newly synthesized compounds were screened for their in vitro antimicrobial activity by an agar plate diffusion method, antioxidant activities such as 1,1-diphenyl-2-picrylhydrazyl (DPPH), radical scavenging activity (RSA), ferric ions (Fe3+) reducing antioxidant power (FRAP), and ferrous (Fe2+) metal ion chelating activity.Result: The structures of all the newly synthesized compounds were characterized by their infrared,1H nuclear magnetic resonance, mass spectral studies, and elemental analysis. Compounds 7a and 7b exhibited good RSA at a concentration 100 μg/ml, compounds 6d, 7a-d and 8a-c displayed good FRAP at a concentration 100 μg/ml, compounds 7b-d and 8b-d showed good Fe2+ ion metal chelating activity. Compounds 6b, 6d, 7a-d, and 8a-d exhibited good activity against all the screened bacteria and fungi.Conclusion: Some of the compounds have shown potent antimicrobial activity against all the screened bacteria and fungi, and some have exhibited very good antioxidant activity.

Cytotoxicity and Antibacterial Studies of Newly Synthesized Novel Heterocylcic Pyridine Derivative and its Metal Complexes

2021 ◽  
Vol 6 (4) ◽  
pp. 243-249
Author(s):  
B.R. Chaitanya Kumar ◽  
K. Sudhakar Babu ◽  
J. Latha
Keyword(s):  
Metal Complexes ◽  
Cell Lines ◽  
Cancer Cell ◽  
Metal Ion ◽  
Analytical Data ◽  
Cancer Cell Lines ◽  
Diffusion Method ◽  
Pyridine Derivative ◽  
Bacterial Strains ◽  
Physico Chemical

A pyridine derivative 2-((E)-1-(2-hydrazinyl-4-methyl-6-phenyl-pyridine-3-carboyl)ethyl)pyridine-4- carbonitrile (CPHPC) ligand and its 3d-metal(II) complexes has been synthesized (where [M = Co(II), Ni(II) and Cu(II)]. The physico-chemical, analytical data, UV-Vis, FT-IR, 1H NMR and ESR spectrum methods were used to characterize all of the synthesized complexes. Spectral investigations of metal(II) complexes revealed that the metal ion is surrounded by an octahedral geometry. Low conductance values indicated that the metal(II) complexes behave as non-electrolyte. The cytotoxic activity on lung cancer cell lines and hepatic cancer cell lines A549 and HepG2, respectively, with the ligand and their metal complexes were tested with MTT assay. The ligand and its metal complexes were tested for diverse harmful bacterial strains using the agar well diffusion method on Gram-negative bacteria such as Pseudomonas desmolyticum, Escherichia coli and Klebsiella aerogenes, as well as Gram-positive bacteria Staphylococcus aureus.

scholarly journals Synthesis, Characterization and Biological Evaluation of Fe(III) and Cu(II) Complexes with 2,4-Dinitrophenyl hydrazine and Thiocyanate Ions

2019 ◽  
Vol 31 (4) ◽  
pp. 780-784
Author(s):  
P. Manimaran ◽  
S. Balasubramaniyan
Keyword(s):  
Antioxidant Activity ◽  
Metal Complexes ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Free Ligand ◽  
Antimicrobial Activities ◽  
Biological Evaluation ◽  
Diffusion Method ◽  
Spectral Studies

The metal complexes of Fe(III) and Cu(II) were prepared by using 2,4-dinitrophenyl hydrazine (DNPH) and thiocyanate (SCN) with stirrer refluxed for about 6 h. The prepared Fe(III) and Cu(II) complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility and electronic spectrum, FT-IR spectral studies. The result suggested the octahedral geometry for Fe(III) and Cu(II) complexes. Powder X-ray diffraction indicate the crystalline nature of the metal complexes. The antimicrobial activities of the Fe(III) and Cu(II) complexes were tested with various micro organisms by disc diffusion method. The antimicrobial results indicate that the metal complexes are highly active with compared to the free ligand. The in vitro antioxidant activity of the free ligand and its metal complexes was assayed by radical scavenging activity (DPPH). The result proposed that Fe (III) and Cu(II) complexes exhibited strong antioxidant activity than that of the ligand.

scholarly journals Synthesis and Spectral Studies of 4,4′-(Hydrazine-1,2-diylidenedimethylylidene)-bis-(2- methoxyphenol) and Its Transition Metal Complexes with Promising Biological Activities

2020 ◽  
Vol 32 (7) ◽  
pp. 1768-1772
Author(s):  
Anita Rani ◽  
Manoj Kumar ◽  
Hardeep Singh Tuli ◽  
Zahoor Abbas ◽  
Vinit Prakash
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Schiff Base Ligand ◽  
Biological Activities ◽  
Condensation Reaction ◽  
Analytical Techniques ◽  
Spectral Studies

The study describes the synthesis, characterization and biological activity of a novel Schiff base ligand and its transition metal complexes. The Schiff base ligand was obtained by a condensation reaction between 4-hydroxy-3-methoxybenzaldehyde (p-vanillin) and hydrazine hydrate using ethanol as solvent. A new series of Ni(II) and Fe(III) complexes were also derived by reaction of prepared Schiff base ligand with NiCl2 and FeCl3. Both the ligand and its metal complexes were characterized by solubility, melting point and elemental analysis. These compounds were further identified by analytical techniques, FTIR, NMR and mass spectrometry. The ligand and its transition metal complexes were also subjected to in vitro biological activities i.e. antimicrobial, antiangiogenic and DNA photo cleavage. For antimicrobial activity compounds were tested against two strains of bacteria and two strains of fungi. Different concentrations of prepared compounds were treated with fertilized chicken eggs and plasmid DNA to find out antiangiogenic and DNA photocleavage activity, respectively.

scholarly journals Synthesis, Spectroscopic, and Antimicrobial Studies on Bivalent Nickel and Copper Complexes of Bis(thiosemicrbazone)

2007 ◽  
Vol 2007 ◽  
pp. 1-7 ◽  
Author(s):  
Sulekh Chandra ◽  
Smriti Raizada ◽  
Monika Tyagi ◽  
Archana Gautam
Keyword(s):  
Metal Complexes ◽  
Metal Ion ◽  
Copper Complexes ◽  
Free Ligand ◽  
Antimicrobial Properties ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Central Metal ◽  
Antimicrobial Studies

A series of metal complexes of Cu(II) and Ni(II) having the general composition[M(L)X2]with benzil bis(thiosemicarbazone) has been prepared and characterized by element chemical analysis, molar conductance, magnetic susceptibility measurements, and spectral (electronic, IR, EPR, mass) studies. The IR spectral data suggest the involvement of sulphur and azomethane nitrogen in coordination to the central metal ion. On the basis of spectral studies, an octahedral geometry has been assigned for Ni(II) complexes but a tetragonal geometry for Cu(II) complexes. The free ligand and its metal complexes have been tested in vitro against a number of microorganisms in order to assess their antimicrobial properties.

scholarly journals Antimicrobial Applications of Transition Metal Complexes of Benzothiazole Based Terpolymer: Synthesis, Characterization, and Effect on Bacterial and Fungal Strains

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Mohamed A. Riswan Ahamed ◽  
Raja S. Azarudeen ◽  
N. Mujafar Kani
Keyword(s):  
Metal Complexes ◽  
Elemental Analysis ◽  
Biological Activities ◽  
Gel Permeation Chromatography ◽  
Spectral Studies ◽  
X Ray Diffraction ◽  
Spectral Techniques ◽  
H Nmr ◽  
Uv Visible ◽  
C Nmr

Terpolymer of 2-amino-6-nitro-benzothiazole-ethylenediamine-formaldehyde (BEF) has been synthesized and characterized by elemental analysis and various spectral techniques like FTIR, UV-Visible, and1H and13C-NMR. The terpolymer metal complexes were prepared with Cu2+, Ni2+, and Zn2+metal ions using BEF terpolymer as a ligand. The complexes have been characterized by elemental analysis and IR, UV-Visible, ESR,1H-NMR, and13C-NMR spectral studies. Gel permeation chromatography was used to determine the molecular weight of the ligand. The surface features and crystalline behavior of the ligand and its complexes were analyzed by scanning electron microscope and X-ray diffraction methods. Thermogravimetric analysis was used to analyze the thermal stability of the ligand and its metal complexes. Kinetic parameters such as activation energy(Ea)and order of reaction (n) and thermodynamic parameters, namely,ΔS,ΔF,S*, andZ, were calculated using Freeman-Carroll (FC), Sharp-Wentworth (SW), and Phadnis-Deshpande (PD) methods. Thermal degradation model of the terpolymer and its metal complexes was also proposed using PD method. Biological activities of the ligand and its complexes were tested againstShigella sonnei,Escherichia coli,Klebsiellaspecies,Staphylococcus aureus,Bacillus subtilis, andSalmonella typhimuriumbacteria andAspergillus flavus,Aspergillus niger,Penicilliumspecies,Candida albicans,Cryptococcus neoformans,Mucor speciesfungi.

scholarly journals Template synthesis of macrocyclic complexes of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II): Spectroscopic, antibacterial and antifungal studies

2010 ◽  
Vol 75 (6) ◽  
pp. 763-772 ◽  
Author(s):  
Dharam Singh ◽  
Vandna Malik ◽  
Ramesh Kumar ◽  
Krishan Kumar
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Metal Ion ◽  
Inhibitory Concentration ◽  
Condensation Reaction ◽  
Carbonyl Oxygen ◽  
Macrocyclic Complexes ◽  
Spectral Studies ◽  
Distorted Octahedral Geometry ◽  
Divalent Metal Ions

A new series of macrocyclic complexes of the type [M(C17H14N4O2)X2], where M = Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and X = Cl-, NO3-, CH3COO-was synthesized by the condensation reaction of malonyldihydrazide with benzil in the presence of divalent metal ions. The complexes were characterized with the aid of elemental analyses, conductance measurements, magnetic susceptibilities, electronic, NMR and infrared spectral studies. On the basis of these studies, a six coordinate distorted octahedral geometry, in which two nitrogen and two carbonyl oxygen atoms are suitably placed for coordination towards metal ion, is proposed for all the complexes. The complexes were tested for their in vitro antibacterial activity and antifungal activities. The minimum inhibitory concentration shown by these complexes were compared with the minimum inhibitory concentration shown by standard drugs.

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