Magnetic and Spectral Studies on 4-Methylpiperazine-1-carbodithioate and 1,10-Phenenthroline or 2,2′-Bipyridyl Mixed-Ligand Complexes of Cobalt(II), Nickel(II) and Copper(II)

2013 ◽  
Vol 83 (2) ◽  
pp. 89-96
Author(s):  
Shashi B. Kalia ◽  
Rajesh Kumar ◽  
Geetanjli Kaushal
Keyword(s):  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Spectral Studies

f-f spectral studies of holmium(III) complexes

1983 ◽  
Vol 36 (4) ◽  
pp. 695 ◽  
Author(s):  
K Iftikhar ◽  
N Ahmad
Keyword(s):  
Coordination Number ◽  
Oscillator Strength ◽  
Magnetic Moment ◽  
Visible Region ◽  
Mixed Ligand ◽  
Oscillator Strengths ◽  
Mixed Ligand Complexes ◽  
Spectral Studies ◽  
Nitrogen Donors ◽  
Covalency Parameters

Holmium(III) mixed-ligand complexes containing ligands having oxygen and nitrogen donors have been spectrophotometrically investigated. The observed spectra in the visible region have been analysed to calculate covalency parameters (β, b� and δ), oscillator strengths and Judd-Ofelt parameters. The degree of covalency in the complexes increases with increase in coordination number. The hypersensitivity is correlated with the degree of covalency and number of coordinated ligands. The higher values of covalency parameters, oscillator strength and magnetic moment in the ten-coordinate HoIII is taken as evidence of participation of f-orbitals in bonding.

scholarly journals X-ray absorption spectral studies of copper (II) mixed ligand complexes

2014 ◽  
Vol 534 ◽  
pp. 012008
Author(s):  
B Soni ◽  
Davood Ah Dar ◽  
B D Shrivastava ◽  
J Prasad ◽  
K Srivastava
Keyword(s):  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Spectral Studies ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Synthesis, Characterization and Antimicrobial Activity of Mixed Schiff Base Ligand Complexes of Co(II), Ni(II), Cu(II) and Zn(II)

2011 ◽  
Vol 8 (3) ◽  
pp. 1258-1263 ◽  
Author(s):  
A. K. Mapari ◽  
M. S. Hate ◽  
K. V. Mangaonkar
Keyword(s):  
Antimicrobial Activity ◽  
Thermogravimetric Analysis ◽  
Schiff Bases ◽  
Free Ligand ◽  
Antimicrobial Activities ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Azomethine Nitrogen ◽  
Diffusion Method ◽  
Spectral Studies

The mixed ligand complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Schiff basesN-(2-hydroxy-1-naphthylidene)-4-methylaniline (L1H) andN-(2-hydroxybenzylidene)-2,3-dimethylaniline (L2H) have been synthesized and characterized. The resulting complexes were characterized by elemental analysis, thermogravimetric analysis, magnetic moment measurements, conductivity measurements,1H NMR, IR, UV-visible and ESR spectral studies. The Schiff bases acts as bidentate monobasic ligands, coordinating through deprotonated phenolic oxygen and azomethine nitrogen atoms. The complexes are non-electrolytic in DMSO. The presence of the two coordinated water molecules in these complexes was indicated by IR spectra and thermogravimetric analysis of the complexes. From the analytical and spectral data the stoichiometry of these complexes have been found to be [M(L1)(L2)(H2O)2] {where M = Co(II) , Ni(II), Cu(II) and Zn(II)}. It is found that Co(II), Ni(II), Cu(II) and Zn(II) complexes exhibited octahedral geometry. The antimicrobial activities of ligands and their mixed ligand complexes were screened by disc diffusion method. It is found that the metal complexes have higher antimicrobial activity than the free ligand.

scholarly journals Synthesis of New Mixed-Ligand Complexes of Molybdenum (IV) and Tungsten(IV): Characterization, Structure, Thermal and Anti-microbial Studies

2019 ◽  
Vol 11 (1) ◽  
pp. 43
Author(s):  
Festus Sunday Fabiyi ◽  
Friday O. Nwosu
Keyword(s):  
1H Nmr ◽  
Antimicrobial Activities ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Spectral Studies ◽  
Mass Spectral ◽  
Bacteria And Fungi ◽  
And Tungsten

Six new mixed-ligand complexes of Mo(IV) and W(IV) ions have been prepared and characterized. The three new complexes of Mo(IV) ions have the molecular formulae MoC12N2O5H18, MoC15N2O5H22 and MoC14N2O6H19 , while the W(II) ions are WC12N2O5H18, WC15N2O5H22 and WC14N2O6H19. The structures of the complexes were deduced from their ir, 1H nmr, and mass spectral studies. All the complexes were found to exhibit octahedral structures. Their antimicrobial activities against some bacteria and fungi species were found to be moderate.

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