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 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.

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 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 Bioactive Metal Complexes of Schiff Base Derived from 2,3-Dioxobutane, Ethane-1,2-diamine and 4-Chloro-2-formylphenol: Spectral Studies and in vitro Antimicrobial Activity

2021 ◽  
Vol 33 (12) ◽  
pp. 3063-3069
Author(s):  
Abhay Nanda Srivastva ◽  
Sayanwita Panja ◽  
Netra Pal Singh ◽  
Chandra Kiran Shriwastaw
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Magnetic Moment ◽  
Metal Ion ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Coordination Behaviour ◽  
Uv Visible ◽  
Iron Chromium

A novel series of trivalent coordination complexes was synthesized by the reaction between a chloride/ acetate salt of iron, chromium, cobalt or manganese ions and NNNNOO type persuasive Schiff base ligand synthesized from 2,3-dioxobutane, ethane-1,2-diamine and 4-chloro-2-formylphenol. Synthesized compounds were characterized by using elemental analysis, molar conductance, magnetic moment, IR, UV-visible, 1H NMR, 13C NMR and ESI-MS spectral analyses. IR and NMR spectra favoured hexadentate coordination behaviour of ligand. Electronic spectra and magnetic moment data reveal Oh geometry with distortion around the metal ion in complexes. The molar conductance values show 1:1 electrolytic nature of complexes. Biological potentiality of the ligand and its metal complexes were tested in vitro against two bacterial and two fungal strains; Bacillus subtilis, Escherichia coli and Aspirgillus niger, Aspirgillus flavus, respectively.

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.

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