scholarly journals SYNTHESIS AND CHARACTERIZATION OF MALONIC ACID DIHYDRAZIDE AND ITS METAL COMPLEXES

2013 ◽  
Vol 12 (24) ◽  
pp. 26-33
Author(s):  
Ramana Kumar KAKARLA ◽  
Raghavendra Guru Prasad ALURU ◽  
Srilalitha VINNAKOTA ◽  
RAO KRISHNA RAO, Ravindranath LAKSHMANA
Keyword(s):  
Metal Complexes ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Enolic Form ◽  
Square Planar ◽  
Zinc Cadmium ◽  
Malonic Acid Dihydrazide ◽  
Formation Of Complexes ◽  
Methanolic Medium

A new series of complexes was synthesized by the reaction between malonyl dihydrazide (MAH) and manganese, copper, nickel, zinc, cadmium, cobalt and ferric salts in methanolic medium. The complexes were characterized by elemental analysis, molar conductance measurements, electronic, IR and 1H NMR spectral studies. Based on the results obtained, the stoichiometry of Fe(III)-MAH and Co(III)-MAH was proposed to be 1:3 and that for Cu(II)-MAH, Cd(II)-MAH, Zn(II)-MAH, Mn(II)-MAH, Ni(II)-MAH was proposed to be 1:2 (M:L). It was suggested that the nitrogen present in the azomethine (>C=N-) group of the enolic form present in the ligand was involved in the formation of complexes. A clear picturisation indicating the bonding sites were depicted for each complex. The metal complexes exhibit different geometries such as tetrahedral, square planar and octahedral arrangements.

scholarly journals Synthesis and Spectral Characterization of Mn(II) and Co(II) Complexes with Tetradentate Macrocyclic Ligand

2021 ◽  
Vol 33 (9) ◽  
pp. 2207-2211
Author(s):  
Usha Bansal ◽  
Samta Goyal ◽  
Swati Agrawal
Keyword(s):  
Metal Complexes ◽  
Infrared Spectra ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Macrocyclic Ligand ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Metal Salts ◽  
Spectral Studies

Manganese(II) and cobalt(II) complexes were synthesized with [N4] tetradentate macrocyclic ligand using different metal salts i.e. MnCl2, Mn(NO3)2, CoCl2 and Co(NCS)2. The ligand was prepared by condensation of glyoxal and carbahydrazide. All these were characterized by elemental analysis, molar conductance measurements, magnetic moment, IR, mass, electronic and EPR spectral studies. Elemental analysis indicates that the complexes have composition MLX2 where (X = Cl–, NO3 –,NCS–). All the complexes were found to be non-electrolytic in nature so can be formulated as [MLX2]. Infrared spectra of metal complexes suggest that the ligand behaves as tetradentate. On the basis of magnetic moment, electronic and EPR spectral data, all the metal complexes were found to be high spin with octahedral geometry.

scholarly journals Spectroscopic and Biological Studies on Newly Synthesized Cobalt (II) and Nickel (II) Complexes with 2-Acetyl Coumarone Semicarbazone and 2-Acetyl Coumarone Thiosemicarbazone

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Sanjay Goel ◽  
Sulekh Chandra ◽  
Sudhanshu Dhar Dwivedi
Keyword(s):  
Magnetic Susceptibility ◽  
Metal Complexes ◽  
Antioxidant Activities ◽  
Molar Conductance ◽  
Metal Salts ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Square Planar ◽  
Biological Studies ◽  
Infrared Spectral

Co(II) and Ni(II) complexes of general composition ML2X2(M = Co(II), Ni(II); X = Cl−,NO3 −) were synthesized by the condensation of metal salts with semicarbazone/thiosemicarbazone derived from 2-acetyl coumarone. The ligands and metal complexes were characterized by NMR, elemental analysis, molar conductance, magnetic susceptibility measurements, IR, and atomic absorption spectral studies. On the basis of electronic, molar conductance and infrared spectral studies, the complexes were found to have square planar geometry. The Schiff bases and their metal complexes were tested for their antibacterial and antioxidant activities.

scholarly journals Synthesis and Characterization of Co(II) and Ni(II) complexes of Schiff base derived from Ninhydrin and Valine

2020 ◽  
Vol 13 (3) ◽  
pp. 265-273
Author(s):  
Bekele Yirga ◽  
Achalu Chimdi ◽  
P.Thillai Arasu
Keyword(s):  
Magnetic Susceptibility ◽  
Metal Complexes ◽  
Analytical Data ◽  
Synthesis Method ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Spectral Studies ◽  
Molar Magnetic Susceptibility ◽  
Donor Behavior

In this study, Complexes of Co (II) and Ni (II) ions with Ruhmann’s purple (ligand) were successfully synthesized and characterized. The complexes of NiL2and CoL2were synthesized by using template condensation synthesis method and characterized by melting point, solubility, elemental analysis, and molar conductance, and magnetic susceptibility, infrared and electronic spectral studies. The complexes, NiL2and CoL2 are soluble in ethanol, partially soluble in Diethyl ether and chloroform and insoluble in hexane and petroleum ether. The complexes, NiL2and CoL2 neither melt nor decompose up to 4200C. The molar conductance of NiL2and CoL2 was 42 Scm2/mol and 46Scm2/mol in respectively. The molar magnetic susceptibility of two complexes was 1.74 BM for NiL2 and 2.76 BM for CoL2. The metal to ligand ratio of both metal complexes was 1:2; both metal complexes are non-electrolytes in ethanol and are paramagnetic at 210C. Based on the spectral data and other analytical data, monobasic ONO donor behavior of the ligand (Ruhmann’s purple) generates octahedral geometry for the pink-green colored Ni (II) complex and green colored Co (II) complex.

scholarly journals Synthesis and characterization of a tetraaza macrocyclic ligand and its Cobalt(II), Nickel(II) and Copper(II) complexes

2010 ◽  
Vol 75 (7) ◽  
pp. 935-941 ◽  
Author(s):  
Sulekh Chandra ◽  
Monika Tyagi ◽  
Swati Agarwal
Keyword(s):  
Fungicidal Activity ◽  
Macrocyclic Ligand ◽  
Pathogenic Fungi ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Conductance Data ◽  
Square Planar ◽  
Nitrogen Donor ◽  
Elemental Analyses

Co(II), Ni(II), and Cu(II) complexes with a tetradentate nitrogen donor [N4] macrocyclic ligand, viz 1,5,8,13-tetraaza-2,9-dimethyl-4,11- diphenylcyclotetradeca-2,4,4,11-tetraene were synthesized. Their structures were determined based on elemental analyses; molar conductance and magnetic susceptibility measurements; and IR, 1H-NMR (ligand), and electronic spectral studies. Based on analytical and molar conductance data, the complexes may be formulated as [M(L)Cl2] and [M?(L)]Cl2 [where M = Co(II) and Cu(II), and M? = Ni(II)] due to their non-electrolytic and 1:2 electrolytic nature. Based on spectral studies, an octahedral geometry was assigned for the Co(II) complex, whereas square-planar and tetragonal geometry were proposed for the Ni(II) and Cu(II) complexes, respectively. The synthesized ligand and its complexes were screened for fungicidal activity against two pathogenic fungi (i.e., Fusarium. moniliformae and Rhizoctonia solani) to assess their growth inhibiting potential.

Synthesis, Characterization and Anticancer Activity of Isonicotinylhydrazide Metal Complexes

2019 ◽  
Vol 41 (1) ◽  
pp. 113-113
Author(s):  
Mansoor Ahmed Zi Ning Lei Mansoor Ahmed Zi Ning Lei ◽  
Mohsin Ali Mohsin Ali ◽  
Syed Imran Ali Syed Imran Ali ◽  
Konatsu Kojima Konatsu Kojima ◽  
Pranav Gupta Pranav Gupta ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Nmr Spectra ◽  
Amorphous Materials ◽  
Physiochemical Properties ◽  
Ftir Studies ◽  
Higher Temperature ◽  
Xrd Patterns ◽  
Scanning Electron ◽  
Formation Of Complexes

This study focuses characterization of iron (II), iron (III), cobalt (II), copper (II) and nickel (II) complexes of Isoniazid (INH) and studying their spectroscopic as well as physiochemical properties. FTIR studies showed that INH binds the metal from oxygen of carbonyl group and nitrogen of amino group. The proton NMR spectra of the metal complexes confirmed the conversion of ligand molecules into their respective metal complexes. However, pattern of splitting and shapes of peaks was observed but the protons resonated in the expected region. XRD patterns may be concluded that the complexes are mostly comprised of nano-sized particles behaving like amorphous materials. Scanning electron microscopy (SEM) revealed marked changes in the morphology of complexes, and their degradation at higher temperature strengthens the hypothesis of the successful formation of complexes. The MTT cytotoxicity assay was used for the screening these complexes against four human cell lines but the results did not prove significant.

scholarly journals Physico-chemical characterization and biological screening of metal complexes with Cyanex 301

1970 ◽  
Vol 34 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Tarun Kumar Pal ◽  
Md Ashraful Alam ◽  
Suchitra Rani Paul
Keyword(s):  
Metal Complexes ◽  
Magnetic Measurements ◽  
Chemical Characterization ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Antibacterial And Antifungal Activities ◽  
Physico Chemical ◽  
Dithiophosphinic Acid ◽  
Cyanex 301 ◽  
Antibacterial And Antifungal

New metal complexes of Mg(II), VO(II), Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Pd(II) with cyanex 301(L) i.e., bis(2,4,4-trimethylpentyl) dithiophosphinic acid were synthesized. The complexes have been characterized by elemental analysis, molar conductivity, molecular mass determination, magnetic measurements, infrared and electronic spectral studies. The prepared metal complexes have the compositions: 2. [MgL2].H2O, 3. [VOL2], 4. K[MnL3].H2O, 5. [FeL3], 6. K[CoL3].H2O, 7. K[NiL3], 8. K[CuL3] and 9. [PdL2]. The complexes 2, 3 and 9 are assumed to have tetrahedral, square pyramidal and square planar geometries, respectively but the complexes 4 - 8 are octahedral based on experimental data. From magnetic measurements the complexes 2 and 9 are found to be diamagnetic and others are paramagnetic. Measured molar conductance showed that the complexes 2, 3, 5 and 9 are non-electrolytes and rest are electrolytes. Besides, some complexes have shown good antibacterial and antifungal activities. Key words: Cyanex 301; Antibacterial; Antifungal; DMSO; Bis (2, 4, 4-trimethylpentyl) dithiophosphinic acid DOI: 10.3329/jbas.v34i2.6859Journal of Bangladesh Academy of Sciences, Vol. 34, No. 2, 153-161, 2010

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 Transition metal complexes with thiosemicarbazide-based ligands. Part 60. Reactions of copper(II) bromide with pyridoxal S-methylisothiosemicarbazone (PLITSC). Crystal structure of [Cu(PLITSC−H)H2O]Br•H2O

2014 ◽  
Vol 79 (3) ◽  
pp. 291-302 ◽  
Author(s):  
Vukadin Leovac ◽  
Ljiljana Vojinovic-Jesic ◽  
Sonja Ivkovic ◽  
Marko Rodic ◽  
Ljiljana Jovanovic ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Elemental Analysis ◽  
Structural Characterization ◽  
Electronic Spectra ◽  
Square Planar

The synthesis and structural characterization of a square-planar copper(II) complex with pyridoxal S-methylisothiosemicarbazone (PLITSC) of the formula [Cu(PLITSC?H)H2O]Br?H2O (1) as the first Cu(II) complex with monoanionic form of this ligand were described. Complex 1 together with two previously synthesized complexes [Cu(PLITSC)Br2] (2) and [Cu(PLITSC)Br(MeOH)]Br (3) were characterized by elemental analysis, IR and electronic spectra and also by the methods of thermal analysis, conductometry and magnetochemistry.

PREPARATION AND CHARACTERIZATION OF SOME BINARY AND TERNARY METAL COMPLEXES OF IMIDAZOLE AND AMINO ACIDS

1966 ◽  
Vol 44 (14) ◽  
pp. 1637-1641 ◽  
Author(s):  
G. N. Rao ◽  
N. C. Li
Keyword(s):  
Aqueous Solution ◽  
Amino Acid ◽  
Metal Complexes ◽  
Proton Magnetic Resonance ◽  
Spectral Studies ◽  
Visible Spectra ◽  
Infrared Spectral ◽  
Ternary Metal ◽  
Ternary Metal Complexes

Five new ternary metal complexes containing imidazole and glycylglycine or amino acid have been prepared and characterized by proton magnetic resonance and infrared spectral studies. Seven new binary metal complexes have also been prepared and studied. The isolation of Cd(imidazole)6Cl2•H2O and Ni(imidazole)6-Cl2•4H2O provides evidence that the coordination number of these metal ions to imidazole in the solid state is six. The visible spectra of the Ni(II) complexes of amino acid and imidazole show that all these are octahedral in aqueous solution.

scholarly journals Synthesis, Characterization of La(III), Nd(III), and Er(III) Complexes with Schiff Bases Derived from Benzopyran-4-one and Thier Fluorescence Study

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
Aida L. El-Ansary ◽  
Nora S. Abdel-Kader
Keyword(s):  
Schiff Bases ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Water Molecules ◽  
Stoichiometric Ratio ◽  
Binuclear Complexes ◽  
Fluorescence Study ◽  
H Nmr ◽  
Coordinated Water

The Schiff bases, L1, L2, and L3, are synthesized from the condensation of 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one (L) with 2-aminopyridine (1), p-phenylenediamine (2), and o-phenylenediamine (3). The prepared Schiff bases react with lanthanum (III), neodymium (III), and erbium (III) nitrate to give complexes with stoichiometric ratio (1 : 1) (ligand : metal). The binuclear complexes of Er(III) with L3 and the three metal ions with L2 are separated. The complexes have been characterized by elemental analysis, molar conductance, electronic absorption, and infrared, 1H-NMR spectral studies. The presence of hydrated and coordinated water molecules is inferred from thermogravimetric analysis. Thermal degradation studies show that the final product is the metal oxide. The luminescence properties of the Nd(III) and Er(III) complexes in dimethylformamide (DMF) solutions were investigated.

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