scholarly journals Studies on Some Hetero Binuclear Copper(II) Schiff base Complexes

2020 ◽  
Vol 36 (05) ◽  
pp. 954-957
Author(s):  
Shivani Prakash ◽  
Anju Kumari Gupta ◽  
Sachin Prakash ◽  
D. Prakash
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Condensation Reaction ◽  
Molar Conductance ◽  
Schiff Base Complexes ◽  
Planar Geometry ◽  
Binuclear Complexes ◽  
Binuclear Copper ◽  
Conductance Measurement ◽  
Square Planar

A series of new hetero binuclear complexes of copper(II) and lead(II) using Schiff base have been synthesized. The Schiff base has been derived from the condensation reaction between Salicylaldehyde and 1,2-Ethylenediamine. The hetero binuclear complexes have been characterized by using elemental analysis, molar conductance measurement, magnetic susceptibility studies, UV-Vis and IR spectra. The studies revealed square planar geometry for the complexes with coordination number four.

scholarly journals Structural and Biological Studies on Transition Metal Complexes of 4-Aminoantipyrine Derivative

2020 ◽  
Vol 32 (11) ◽  
pp. 2846-2854
Author(s):  
V. Soundaranayaki ◽  
A. Kulandaisamy
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Antimicrobial Activities ◽  
Esr Spectra ◽  
Molar Conductance ◽  
Schiff Base Complexes ◽  
Binding Potential ◽  
Planar Geometry ◽  
Pyramidal Geometry ◽  
Biological Studies

Novel tetra dentate Cu(II), Ni(II), Co(II), VO(II) and Zn(II) Schiff base complexes have been synthesized from salicylidene-4-iminoantipyrine and tyrosine. The synthesized Schiff base complexes was characterized by powder X-ray diffraction studies (XRD), scanning electron microscopy (SEM), FT-IR, ESR, 1H NMR, 13C NMR, UV-vis, molar conductance and magnetic susceptibility measurements. The general formula of complexes was confirmed as [ML] type [M = Cu(II), Co(II), Zn(II), Ni(II) and VO(II); L = C27H24N4O4]. Magnetic susceptibility, IR and UV-vis, spectral data showed that all the complexes have square planar geometry except vanadyl complex which suggests square pyramidal geometry. Lower molar conductance values proved that all the chelates were non-electrolytic nature. The X-band ESR spectra of [CuL] and [VOL] complexes in DMSO solution suggest that the complexes were predominant covalent character. Powder XRD and SEM image pattern evidenced that all the compounds were crystalline in nature and their size ranges from 100-40 nm. Calf thymus DNA binding potential of [CuL] and [VOL] complexes shows that the binding occurs through intercalation mode with low binding constant. The analgesic, CNS, antiulcer and antimicrobial activities of the investigated compounds report reveals that the chelates were significant effect than free Schiff base.

scholarly journals Some new transition metal complexes of bis (2-methyl furfuraldene)-4,4`-methylene bis (cyclohexylamine) ligand

2013 ◽  
Vol 10 (3) ◽  
pp. 569-582
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Transition Metal Complexes ◽  
Molar Conductance ◽  
Metal Salts ◽  
Schiff Base Complexes ◽  
Molar Ratio ◽  
Tetrahedral Structure ◽  
Coordination Sites ◽  
Square Planar

New Fe(II),Co(II),Ni(II),Cu(II) and Zn(II) Schiff base complexes which have the molar ratio 2:1 metal to ligand of the general formula [M2( L) X4] (where L=bis(2-methyl furfuraldene)-4-4`-methylene bis(cyclo-hexylamine) ) were prepared by the reaction of the metal salts with the ligand of Schiff base derived from the condensation of 2:1 molar ratio of 2-acetyl furan and 4-4`-methylene bis (cyclohexylamine). The complexes were characterized by elemental analysis using atomic absorption spectrophotometer ,molar conductance measurements, infrared, electronic spectra,and magnetic susceptibility measurement. These studies revealed binuclear omplexes. The metal(II) ion in these complexes have four coordination sites giving the most expected tetrahedral structure and square planar for Cu(II)ion.

scholarly journals Synthesis, Characterization, and Magnetic and Thermal Studies on Some Metal(II) Thiophenyl Schiff Base Complexes

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Aderoju Amoke Osowole
Keyword(s):  
Schiff Base ◽  
Elemental Analysis ◽  
Thermal Studies ◽  
Schiff Base Complexes ◽  
Magnetic Data ◽  
Planar Geometry ◽  
Tetrahedral Geometry ◽  
H Nmr ◽  
Square Planar

4-(Thiophen-3-yl)-aniline undergoes condensation with o-vanillin to form an ONS donor Schiff base, 2-methoxy-6-[(4-thiophene-3-yl-phenylimino)-methyl]-phenol, which forms complexes of the type [ML2]xH2O (where M = Mn, Co, Ni, Cu, Zn, Pd). These complexes are characterized by elemental analysis, 1H nmr, electronic, mass, and IR spectroscopies and conductance measurements. The electronic, IR and CHN data are supportive of a 4-coordinate tetrahedral geometry for Mn(II), Co(II), Ni(II), and Zn(II) complexes and square-planar geometry for Cu(II) and Pd(II) complexes, with the chromophores N2O2. The magnetic data reveals that the complexes are magnetically dilute and mononuclear with exception of the Cu(II) complex, which exhibits some anti-ferromagnetisms. The complexes are air-stable solids, and none is an electrolyte in nitro methane.

Enhanced catalytic activity and magnetization of encapsulated nickel Schiff-base complexes in zeolite-Y: a correlation with the adopted non-planar geometry

2016 ◽  
Vol 45 (47) ◽  
pp. 18967-18976 ◽  
Author(s):  
Archana Choudhary ◽  
Bidisa Das ◽  
Saumi Ray
Keyword(s):  
Magnetic Properties ◽  
Schiff Base ◽  
Catalytic Activity ◽  
Zeolite Y ◽  
Schiff Base Complexes ◽  
Planar Geometry ◽  
Catalytic Activities ◽  
Square Planar ◽  
Optical And Magnetic Properties

Square planar Ni(ii)-Schiff base complexes when encapsulated in a supercage of zeolite Y have shown altered optical and magnetic properties and catalytic activities in comparison to their corresponding free states.

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.

Crystal Structure and Magnetic Properties of a Binuclear Copper(II) Complex Bridged by an Alkoxo-oxygen Atom and an Acetate Ion

2000 ◽  
Vol 55 (11) ◽  
pp. 1067-1073 ◽  
Author(s):  
C. T. Zeyrek ◽  
A. Elmali ◽  
I. Svoboda ◽  
H. Fuess
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Planar Geometry ◽  
Monoclinic Space Group ◽  
Ferromagnetic Coupling ◽  
Binuclear Copper ◽  
Temperature Dependent ◽  
Square Planar ◽  
Fitting Parameters

[Cu4(L)2(O2CMe)2] H2O (L = 1,3-bis(5-bromo-2-hydroxybenzylidene)propan-2-ol) was synthesized and its crystal structure determined. (C38H34N4O10Br4Cu4)·H2O, monoclinic, space group P21/c, a = 21.072(5), b = 9.673(2), c = 21.934(4) Å, β = 109.73(2)°, V = 4208(2) Å3, Z = 4. The crystal structure consists of two independent binuclear copper(II) complexes and the non-coordinating water molecule in the asymetric unit. The Cu(II) ions are in a square-planar geometry and coordinated by donor atoms of the ligand (NO3).The average Cu···Cu distance and average Cu-O-Cu angle are 3.491(2) Å and 132.0(1)°, respectively. Temperature-dependent magnetic susceptibility measurements of the complex show an intramolecular anti ferromagnetic coupling in the dimeric Cu(II) core. The fitting parameters are -2J = 174.4 cm-1, g = 1.98.

scholarly journals Synthesis and Characterization of Schiff Base Complexes of Cu(II), Co(II) and Cd(II) Derived from Ethylenediamine and Benzaldehyde Derivatives

2020 ◽  
pp. 34-46
Author(s):  
Md. Shahinur Islam ◽  
Md. Rezaul Haque Ansary ◽  
Md. Akhter Farooque ◽  
Md. Ali Asraf
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Metal Ion ◽  
Pathogenic Bacteria ◽  
Condensation Reaction ◽  
Antibacterial Activities ◽  
Schiff Base Complexes ◽  
Standard Drug ◽  
Uv Visible ◽  
Benzaldehyde Derivatives

Metal complexes of Cu(II), Co(II) and Cd(II) have been synthesized using two new Schiff base ligands, N,N'-bis(4-chlorobenzylidene)ethane-1,2-diamine (L1) and N,N'-bis(3-nitrobenzylidene) ethane-1,2-diamine (L2). The Schiff bases were prepared from the condensation reaction of ethylenediamine with benzaldehyde derivatives (4-chlorobenzaldehyde and 3-nitrobenzaldehyde). The complexes have been characterized by elemental analysis, conductivity measurements, UV-visible, FT-IR and magnetic susceptibility measurements. The magnetic susceptibility measurements and UV-visible spectral data revealed that the geometry of Cu(II) and Co(II) complexes are square planar, whereas the geometry of Cd(II) complex is tetrahedral. The molar conductance data showed that the complexes are non-electrolytic in nature. The complexes were screened for antibacterial activities against four human pathogenic bacteria viz. Escherichia coli, Shigella boydii, Bacillus cereus and Staphylococcus aureus. The results indicate that Cd(II) complex of ligand (L1) has higher antibacterial activity compared to the free ligands, but less than the standard drug, kanamycine. This suggests that the metal ion plays an important role in the antibacterial activities of complexes.

scholarly journals SYNTHESIS, SPECTROSCOPIC, IN-VITRO ANTIBACTERIAL ACTIVITIES OF A 4-NITROPHENOL LIGAND AND ITS METAL (II) COMPLEXES

2020 ◽  
Vol 3 (2) ◽  
pp. 249-256
Author(s):  
Olubunmi Adewusi ◽  
Keyword(s):  
Magnetic Susceptibility ◽  
Antimicrobial Agents ◽  
Magnetic Moments ◽  
Antibacterial Activities ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Planar Geometry ◽  
Antimicrobial Studies ◽  
Square Planar

Novel Schiff base 2-((E)-(1H-indol-5-ylimino)methyl)-4-nitrophenol ligand and its Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Pd(II) complexes were synthesized by the stoichiometric reactions between the metal (II) ions and ligand in molar ratio M:L (1:1). The synthesized compounds were characterized using melting point, solubility, molar conductance, room temperature magnetic susceptibility, infra-red and electronic spectroscopies. The assignments of four-coordinate tetrahedral/square planar geometries and the bidentate nature to the complexes was corroborated by IR, electronic spectroscopies, and magnetic moments. The Pd(II) complex however was assigned an octahedral geometry. The in-vitro antimicrobial studies revealed the potential of some of the compounds as antimicrobial agents. The ligand and its metal complexes exhibited good to moderate antimicrobial activity against tested bacteria with selective inactivity against P. mirabilis and P. aureginosa. Keywords: 2-((E)-(1H-indol-5-ylimino)methyl)-4-nitrophenol, magnetic susceptibility, square planar geometry, inhibitory zone.

scholarly journals Crystal structure, Hirshfeld surface analysis and computational study of bis(2-{[(2,6-dichlorobenzylidene)hydrazinylidene]methyl}phenolato)cobalt(II) and of the copper(II) analogue

2020 ◽  
Vol 76 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Rohit B. Manawar ◽  
Mayank J. Mamtora ◽  
Manish K. Shah ◽  
Mukesh M. Jotani ◽  
Edward R. T. Tiekink
Keyword(s):  
Schiff Base ◽  
Benzene Ring ◽  
Computational Study ◽  
Schiff Base Complexes ◽  
Planar Geometry ◽  
Site Symmetry ◽  
Π Interactions ◽  
Square Planar ◽  
Benzene Rings ◽  
Dispersion Terms

The title homoleptic Schiff base complexes, [M(C14H9Cl2N2O)2], for M = CoII, (I), and CuII, (II), present distinct coordination geometries despite the Schiff base dianion coordinating via the phenolato-O and imine-N atoms in each case. For (I), the coordination geometry is based on a trigonal bipyramid whereas for (II), a square-planar geometry is found (Cu site symmetry \overline{1}). In the crystal of (I), discernible supramolecular layers in the ac plane are sustained by chlorobenzene-C—H...O(coordinated), chlorobenzene-C—H...π(fused-benzene ring) as well as π(fused-benzene, chlorobenzene)–π(chlorobenzene) interactions [inter-centroid separations = 3.6460 (17) and 3.6580 (16) Å, respectively]. The layers inter-digitate along the b-axis direction and are linked by dichlorobenzene-C—H...π(fused-benzene ring) and π–π interactions between fused-benzene rings and between chlorobenzene rings [inter-centroid separations = 3.6916 (16) and 3.7968 (19) Å, respectively] . Flat, supramolecular layers are also found in the crystal of (II), being stabilized by π–π interactions formed between fused-benzene rings and between chlorobenzene rings [inter-centroid separations = 3.8889 (15) and 3.8889 (15) Å, respectively]; these stack parallel to [10\overline{1}] without directional interactions between them. The analysis of the respective calculated Hirshfeld surfaces indicate diminished roles for H...H contacts [26.2% (I) and 30.5% (II)] owing to significant contributions by Cl...H/H...Cl contacts [25.8% (I) and 24.9% (II)]. Minor contributions by Cl...Cl [2.2%] and Cu...Cl [1.9%] contacts are indicated in the crystals of (I) and (II), respectively. The interaction energies largely arise from dispersion terms; the aforementioned Cu...Cl contact in (II) gives rise to the most stabilizing interaction in the crystal of (II).

scholarly journals sw uobaghdad edu iqSynthesis and Characterization of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II) Complexes with Symmetrical Schiff base

2013 ◽  
Vol 10 (3) ◽  
pp. 618-626
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
General Formula ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Metal Salts ◽  
Binuclear Complexes ◽  
Spectral Measurements ◽  
Tetrahedral Structure

New binuclear Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II) Complexes of N2S2 tetradentate or N4S2 hexadentate symmetric Schiff base were prepared by the condensation of butane-1,4-diylbis(2-amino ethylcarbamodithioate) with 3-acetyl pyridine. The complexes having the general formula [M2LCl4] (where L=butane-1,4-diyl bis (2-(z)-1-(pyridine-3-ylethylidene amino))ethyl carbamodithioate, M= Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Hg(II)), were prepared by the reaction of the mentioned metal salts and the ligand. The resulting binuclear complexes were characterized by molar conductance, magnetic susceptibility ,infrared and electronic spectral measurements. This study indicated that Mn(II), Ni(II) and Cu(II) complexes have octahedral geometry, while Co(II) Zn(II) and Hg(II) complexes are proposed to be tetrahedral structure .K

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