scholarly journals Structural studies on di-µ-thiocyanato(N,S)-bis(ligand)diisothiocyanato metal(II)bis(triphenylphosphine)mercury(II) and selenocyanate analogs

1979 ◽  
Vol 57 (4) ◽  
pp. 394-399 ◽  
Author(s):  
P. P. Singh ◽  
S. P. Yadav
Keyword(s):  
Elemental Analysis ◽  
Magnetic Moment ◽  
Molar Conductance ◽  
Mixed Ligand ◽  
Spectral Studies ◽  
Structural Studies ◽  
Mixed Metal

Binuclear mixed-metal mixed-ligand monomeric bridged complexes of the type (XCN)2(L)2M(NCX)2Hg(PPh3)2 (M = Co(II), Ni(II), Cu(II), Zn(II); L = pyridine, nicotinamide; PPh3 = triphenylphosphine; X = S, Se) have been synthesized and characterized by elemental analysis, molar conductance, magnetic moment, and infrared and electronic spectral studies. In all the complexes, the most likely structure involves pyridine or nicotinamide linked to M and PPh3 to Hg. Total softness calculations have also been made to extend support to the structure of the complexes.

Synthesis and structural studies of some tetrathiocyanate and tetraselenocyanate binuclear mixed-metal complexes

1977 ◽  
Vol 30 (9) ◽  
pp. 1921 ◽  
Author(s):  
PP Singh ◽  
SP Yadav ◽  
SB Sharma
Keyword(s):  
Metal Complexes ◽  
Magnetic Moment ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Structural Studies ◽  
Triphenyl Phosphine ◽  
Mixed Metal ◽  
Elementary Analysis ◽  
Mixed Metal Complexes

Complexes of MM?(XCN)4 (M = CoII, NiII; M? = ZnII, CdII, HgII; X = S, Se) with triphenyl-phosphine have been synthesized and characterized by elementary analysis, molar conductance, magnetic moment, infrared and electronic spectral studies. All the complexes are binuclear mixed- metal monomeric bridged of the type (Ph3P)2M(NCX)2M?(XCN)2 except for [Ni(PPh3)4] [Zn(NCS)4] which is cationic-anionic.

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 Synthesis, DFT and Bio-Potential Activities of Mn(II) and Hg(II) Complexes with Bidentate (E)-N′[(E)-3-Phenylallylidene]benzene-1,2-diamine

2021 ◽  
Vol 33 (6) ◽  
pp. 1222-1228
Author(s):  
R. Selvarani ◽  
S. Balasubramaniyan ◽  
K. Rajasekar ◽  
M. Thairiyaraja ◽  
R. Meenakshi
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Radical Scavenging ◽  
Molar Conductance ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Planar Geometry ◽  
Dpph Method

A new bidentate Schiff base (E)-N′[(E)-3-phenylallylidene]benzene-1,2-diamine derived from the condensation of o-phenylenediamine and cinnamaldehyde and its Mn(II) and Hg(II) complexes were synthesized and characterized by elemental analysis, molar conductance, magnetic moment, electronic spectra, IR, far-IR and NMR (1H & 13C) spectral studies. The elemental analysis and these metal proposed the metal:ligand stoichiometry and molecular formulae of the metal complexes. The molar conductance and electrochemical property indicates monomeric, neutral nature and redox properties of the metal complexes. The UV-visible spectral study supports the octahedral geometry for Mn(II) complex and square planar geometry for Hg(II) complex and further confirmed by magnetic moment. IR spectral data examined the coordination mode but far-IR is useful to identify the metal-ligand vibrations. The geometry, magnetic property and unsymmetrical nature of these metal complexes corroborated by NMR (1H & 13C) spectra. The DFT of Mn(II) complex studied and the structure optimized by B3LYP/Lan L2DZ using Gaussian 09W. Quantum chemical calculations were done by Mullikan population analysis, HOMO-LUMO and molecular electrostatic potential. The in vitro biological screening effects of the investigated complexes were tested against some bacteria and fungus by agar-well diffusion method. The results indicated that Mn(II) and Hg(II) complexes exhibit potentially active than the Schiff base which was further confirmed by pharmacokinetics study. The antioxidant activity of Schiff base and its Mn(II) complex was examined by radical scavenging DPPH method.

scholarly journals Antibacterial Activity of Macrocyclic Complexes of Cu(II), Ni(II) and VO(II) Derived fromo-Aminobenzaldehyde

2012 ◽  
Vol 9 (1) ◽  
pp. 481-486
Author(s):  
K. Anuradha ◽  
R. Rajavel
Keyword(s):  
Antibacterial Activity ◽  
Elemental Analysis ◽  
Molar Conductance ◽  
Macrocyclic Complexes ◽  
Spectral Studies ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria

Novel Cu(II),Ni(II) and VO(II) complexes are synthesized with N1,N4-bis(2-aminobenzylidene)benzene-1,4-diamine (L). Complexes were characterized by elemental analysis, molar conductance, IR, UV and EPR. Spectral studies reveals a square planner geomentry for Cu(II), Ni(II) complexes and square pyramidal for VO(II) complex. The ligand and its complexes were also evaluated against the growth of gram positive bacteria and gram negative bacteria.

Complexes of Bis(phenyldithiocarbazato)mckel(II) with Triphenylphosphane and Some Ditertiary Phosphanes

1984 ◽  
Vol 39 (12) ◽  
pp. 1676-1679 ◽  
Author(s):  
A. A. M. Aly ◽  
M. M. Kamal ◽  
M. S. El Meligy ◽  
A. I. El Said
Keyword(s):  
Ir Spectra ◽  
Magnetic Moment ◽  
Biological Activities ◽  
Molar Conductance ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Square Planar

Mixed ligand complexes of bis(phenyldithiocarbazato)nickel(II) with triphenylphosphane and a number of ditertiary phosphanes have been synthesised. The complexes were characterised on the basis of molar conductance, magnetic moment values, electronic and IR spectra. Out of the five prepared com plexes the mixed ligand complexes with triphenylphosphane and bis(diphenylphosphino) m ethane are paramagnetic, the mixed ligand complexes with bis(diphenylphosphino) ethane, -propane, and -butane are diamagnetic. The complexes were assigned octahedral, square planar or square pyramidal structures. The biological activities of the complexes were also tested.

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 Spectral, Magnetic and Biological Studie on Some Bivalent 3d Metal Complexes of Hydrazine Derived Schiff-Base Ligands

1997 ◽  
Vol 4 (2) ◽  
pp. 65-68 ◽  
Author(s):  
Zahid H. Chohan ◽  
Syed K. A. Sherazi
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Bacterial Species ◽  
Biological Properties ◽  
Molar Conductance ◽  
Schiff Base Ligands ◽  
H Nmr ◽  
3D Metal Complexes

Metal(II) complexes of hydrazine derived Schiff-base ligands of the type M(L)2Cl2 where M = Co, Cu, Ni and Zn and L = L1 and L2 have been prepared and characterised by molar conductance, magnetic moment, elemental analysis and electronic, IR, H-NMR and C13 spectral data.The different modes of chelation of the ligands and their comparative biological properties against different bacterial species are reported.

scholarly journals Synthesis and spectroscopic characterization of some lanthanide(III) nitrate complexes of 3-[3-carboxyethyl-4,5- dimethylthiophene-2-yl)azo]pent-2,4-dione

2011 ◽  
Vol 76 (2) ◽  
pp. 249-261 ◽  
Author(s):  
Janardhanan Athira ◽  
Yesodharan Sindhu ◽  
Susamma Sujamol ◽  
Kochukittan Mohanan
Keyword(s):  
Elemental Analysis ◽  
Metal Ion ◽  
Spectroscopic Characterization ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Structural Form ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nitrate Complexes

3-[3-Carboxyethyl-4,5-dimethylthiophene-2-yl)azo]pent-2,4-dione was synthesized by coupling diazotized 2-amino-3-carboxyethyl- 4,5-dimethylthiophene with acetylacetone. Based on various spectral studies and elemental analysis, an intramolecularly hydrogen bonded azoenol structural form was assigned for the ligand. This ligand is versatile in forming a series of lanthanide(III) complexes viz, lanthanum(III), cerium(III), praseodymium(III), neodymium(III), samarium(III) and gadolinium(III), which were characterized through various spectral studies, elemental analysis, magnetic susceptibility measurements, molar conductance and thermal analysis. The spectral data revealed that the ligand acted as a neutral tridentate, coordinating to the metal ion through one of the azo nitrogen atoms, the ester carbonyl and the enolic oxygen of the acetylacetone moiety, without deprotonation. Molar conductance values adequately supported their non-electrolytic nature. The ligand and lanthanum(III) complexes were subjected to X-ray diffraction studies. In addition, the lanthanum(III) complex underwent a facile transesterification reaction on refluxing with methanol for a long period. The thermal behavior of the lanthanum(III) complex was also examined.

scholarly journals Synthesis and characterization of bioactive binuclear transition metal complexes of Schiff base ligand derived from 4-amino-pyrimidine-2-one, diacetyl and glycine

2014 ◽  
Vol 79 (4) ◽  
pp. 421-433 ◽  
Author(s):  
Abhay Srivastava ◽  
Netra Singh ◽  
Chandra Shriwastaw
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Schiff Base Ligand ◽  
Magnetic Moment ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Conductance Measurement ◽  
Amino Pyrimidine

A series of novel binuclear transition metal complexes was synthesized by reaction of a Schiff base ligand (1-Methyl-2-(2-oxo-1,2-dihydro-pyrimidin-4-ylimino)-propylideneamino-acetic acid) (LaH) derived from 4-amino-pyrimidine-2-one, diacetyl, glycine and corresponding chloride salt of Cu(II), Ni(II), Co(II) and Zn(II) metals in 1:1 (metal : ligand) molar ratio. The compounds were characterized by elemental analyses, molar conductance measurement, magnetic moment measurement and various spectral studies viz. IR, UV-visible, 1H-NMR, 13C-NMR, EPR and ESI-MS. Molar conductance measurement data revealed non-electrolytic nature of metal complexes. Electronic absorption spectral data, electronic paramagnetic resonance parameters and magnetic moment values revealed an octahedral geometry for binuclear metal complexes. Cyclic voltammetric study of Ni(II) complex shows a couple of one electron anodic responses near 0.70 V and 1.10 V. In vitro biological activity of Schiff base ligand and binuclear complexes has been checked against bacteria (Staphylococcus aureus, Bacillus subtilis, Escherichia coli and Salmonella typhi) and fungi (Candida albicans and Candida parapsilosis) to assess their antibacterial and antifungal properties.

scholarly journals Mixed Ligand Complexes ofN-Methyl-N-phenyl Dithiocarbamate: Synthesis, Characterisation, Antifungal Activity, and Solvent Extraction Studies of the Ligand

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Anthony C. Ekennia ◽  
Damian C. Onwudiwe ◽  
Cyril Ume ◽  
Eno E. Ebenso
Keyword(s):  
Antifungal Activity ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Uv Spectroscopy ◽  
Cobalt Complex ◽  
Pathogenic Fungi ◽  
Mixed Ligand ◽  
Bidentate Coordination ◽  
Nickel Ions ◽  
Monodentate Coordination

A series of mixed ligand dithiocarbamate complexes with a general formula [ML2(py)2], where M = Mn(II), Co(II), Ni(II), and Cu(II), py = pyridine, and L =N-methyl-N-phenyl dithiocarbamate have been prepared and characterised by elemental analysis, FTIR and Uv spectroscopy, magnetic moment, and thermogravimetric and conductance analysis. The infrared spectra showed that symmetrical bidentate coordination occurred with the dithiocarbamate moiety through the sulfur atoms, while neutral monodentate coordination occurred through the nitrogen atom for the pyridine molecule in the complexes. The electronic spectra, elemental analysis, and magnetic moment results proved that the complexes adopted octahedral geometry. The conductance measurement showed that the complexes are nonelectrolytes proving their nonionic nature. The compounds were screened for three human pathogenic fungi:Aspergillus flavus, Aspergillus niger, andCandida albicans. The cobalt complex showed the best antifungal activity among the test compounds. Liquid-liquid extractive abilities of the ligand towards copper and nickel ions in different solvent media were investigated. The ligand showed a strong binding affinity towards the metals ions with an extractive efficiency of about 99%.

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