scholarly journals Synthesis, Biological, Spectral, and Thermal Investigations of Cobalt(II) and Nickel(II) Complexes of N-Isonicotinamido-2′,4′-Dichlorobenzalaldimine

2006 ◽  
Vol 2006 ◽  
pp. 1-9 ◽  
Author(s):  
Ram K. Agarwal ◽  
Deepak Sharma ◽  
Lakshman Singh ◽  
Himanshu Agarwal
Keyword(s):  
Magnetic Susceptibility ◽  
Metal Complexes ◽  
Electronic Spectra ◽  
Pathogenic Fungi ◽  
Antibacterial Activities ◽  
Octahedral Geometry ◽  
Conductivity Measurements ◽  
Thermal Investigations ◽  
Elemental Analyses

A new series of 12 complexes of cobalt(II) and nickel(II) with N-isonicotinamido-2′,4′-dichlorobenzalaldimine (INH-DCB) with the general composition MX2⋅n(INH-DCB) [M = Co(II) or Ni(II), X = Cl−, Br−,NO3−, NCS−, or CH3COO−, n = 2; X = ClO4−, n = 3] have been synthesized. The nature of bonding and the stereochemistry of the complexes have been deduced from elemental analyses, infrared, electronic spectra, magnetic susceptibility, and conductivity measurements. An octahedral geometry has been suggested for all the complexes. The metal complexes were screened for their antifungal and antibacterial activities on different species of pathogenic fungi and bacteria and their biopotency has been discussed.

scholarly journals Biological Active Cobalt(II) and Nickel(II) Complexes of 12-Membered Hexaaza [N6] Macrocyclic Ligand Synthetic and Spectroscopic Aspects

2010 ◽  
Vol 7 (4) ◽  
pp. 1238-1245 ◽  
Author(s):  
Umendra Kumar ◽  
Sulekh Chandra
Keyword(s):  
Thermal Analysis ◽  
Magnetic Susceptibility ◽  
Metal Ion ◽  
Macrocyclic Ligand ◽  
Pathogenic Fungi ◽  
Spectroscopic Studies ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Conductivity Measurements ◽  
Macrocyclic Schiff Base

New cobalt(II) and nickel(II) complexes of 12-membered macrocyclic Schiff - base ligand containing thiosemicarbazone moiety as a part of ring have been prepared having general composition [MLX2] where M = Co(II) or Ni(II), L=3,4,9,10–tetra-2-furanyl-1,2,5,6,8,11- hexaazacyclododeca-7,12- dithione - 2,4,8,10 – tetraene, X = Cl-, NO3-, NCS-. The complexes have been characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, spectral (IR, electronic, EPR) techniques and thermal analysis. Spectroscopic studies suggested a six coordinated octahedral geometry for all the complexes. The IR spectra of complexes suggest that ligand is coordinated to the metal ion through its four imines nitrogen. Conductivity measurements supported the non electrolytic nature of the complexes. The antifungal activities of complexes have been studied against a number of pathogenic fungi under laboratory conditions. The complexes showed good antifungal results. Thermal analysis of reported complexes suggests the absence of water molecule either in or outside the coordination sphere.

scholarly journals Synthesis characterization of Cr(III), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) complexes of 2,12-dimethyl-3-13-di-n-propyl-l,4,ll,14-tetraazacycloeicosa-1,13,l1,13-tetraene

2002 ◽  
Vol 67 (12) ◽  
pp. 825-832 ◽  
Author(s):  
Raghu Prasad ◽  
Mala Mathur
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Electronic Spectra ◽  
Magnetic Measurements ◽  
Elemental Analyses

Metal complexes of a 20-membered tetraazamacrocycle 2,12-dimethyl-3,13-di-n-propyl 1,4,11,14-tetraazacycloeicosa-1,3,11,13-tetraene(L) of the type [MLX2]X(M=Cr(III), Fe(III); X=NO3)[CoLNO3]NO3, [NiL(NO3)2], [CuL]Cl2 and [ZnLCl2]have been prepared by 2+2 cyclocondensation of 2,3-hexanedione with 1,6-diaminohexane in the presence of metal ions as templates. These complexes were characterized by elemental analyses, conductances, IR and electronic spectra and magnetic measurements.

scholarly journals Spectroscopic studies of benzoxazole-2-thione complexes. Derivatives of cobalt(II) and nickel(II) halides

1976 ◽  
Vol 54 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Carlo Preti ◽  
Giuseppe Tosi
Keyword(s):  
Magnetic Susceptibility ◽  
Ir Spectra ◽  
Electronic Spectra ◽  
Spectroscopic Studies ◽  
Ligand Field ◽  
Conductivity Measurements ◽  
Derivatives Of ◽  
Ligand Field Parameters ◽  
Cobalt And Nickel

The preparation of some complexes of benzoxazole-2-thione with halides of cobalt(II) and nickel(II) is reported. The complexes of cobalt(II) and nickel(II) are tetrahedral of the type ML2X2 with the exception of NiLBr2. The complexes have been studied by means of magnetic susceptibility measurements, infrared and far ir spectra, electronic spectra, and conductivity measurements. The ligand behaves as monodentate N-bonded. The various ligand field parameters, Dq, B′, and β show about 60 and 80% of covalency in the cobalt(II) and nickel(II) complexes respectively and suggest a medium strong ligand field. The spectroscopy parameters of cobalt and nickel derivatives confirm the presence of CoN2X2 and NiN2X2 chromophores.

Synthesis, Structural Chemistry, and Biological Studies on Various Divalent Copper Chelates of Novel Ligands Derived from Food Preservative, Dehydroacetic Acid, with Anilines

2019 ◽  
Vol 41 (6) ◽  
pp. 1055-1055
Author(s):  
Ahmed Hassan Abdel Salam Ahmed Hassan Abdel Salam
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Copper Ions ◽  
Antibacterial Activities ◽  
Molar Conductance ◽  
Thermal Stabilities ◽  
Dehydroacetic Acid ◽  
Biological Studies ◽  
Water Of Hydration ◽  
Elemental Analyses

Various six coordinated copper(II) complexes of novel (E)-4-hydroxy-6-methyl-3-(1-(p-tolylimino) ethyl-2H-pyran-2-one (HL1) and (E)-3-(1-(4-chlorophenylimino) ethyl-4-hydroxy-6-methyl-2H-pyran-2-one (HL2) derived from 3-Acetyl-2-hydroxy-6-methyl-4H-pyran-4-one (dehydroacetic acid, DHA) and aniline derivatives (p-chloroaniline and p-toluidine) were fabricated. The coordination mode of Schiff base donor atoms with copper ions was well investigated by thermal and elemental analyses, FTIR, UV-vis, 1H, 13C-NMR spectral tools and measurements of magnetic susceptibility as well as molar conductance at ambient temperature. The novel neutral bidentate Schiff base ligands (HL1 and HL2) linked to Cu(II) cation via the azomethine-N and hydroxyl-O atoms and to acetate and nitrate anions in bidentate bridging mode to form polymeric octahedral complexes. The thermal study showed the stepwise removal of water of hydration and anions and decomposition of these chelates. The decomposition products were examined and the relative thermal stabilities of these chelates were evaluated. Different parameters of activation were derived from the thermal curves by Coats–Redfern methodology. The degradation steps of the metal complexes had positive free energy values indicating their non-spontaneous nature. The antifungal and antibacterial activities of all investigated compounds were also studied. The magnetic susceptibility measurements and conductance data were investigated and provided evidence for the non-electrolytic character of the complexes.

Transition Metal Complexes of Ambidinourea and Related Ligands.

1969 ◽  
Vol 24 (12) ◽  
pp. 1514-1517 ◽  
Author(s):  
A. Syamal
Keyword(s):  
Magnetic Susceptibility ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Electronic Spectra ◽  
Strong Field ◽  
Absorption Bands ◽  
Effect Of Solvents ◽  
Infra Red ◽  
Solid Complexes

Copper (II), nickel (II), and palladium (II) complexes of amidinourea are reinvestigated in order to verify their structure. Electronic spectra and magnetic susceptibility measurements have been obtained on the solid complexes. Electronic spectral results indicate the donor strength of amidinourea is comparable to strong field ligands like biuret, biguanide, and I-amidino-O-alkylurea. Infra-red spectral results suggest that the carbonyl group of amidinourea is not involved in coordination and the donor atoms in amidinourea are amide nitrogens. The effect of solvents on the absorption bands is also discussed. The solution absorption spectra of bis (amidinourea) copper (II) chloride in different solvents indicate the following order of decreasing tetragonality:DMSO > methanol > ethyleneglycol > water.

scholarly journals Synthesis, spectral studies and antibacterial activity of Cu(II), Co(II) and Ni(II) complexes of 1-(2-hydroxyphenyl)-3-phenyl-2-propen-1-one, N2-[(3,5-dimethyl-1H-pyrazol- -1-yl)methyl]hydrazone

2009 ◽  
Vol 74 (8-9) ◽  
pp. 927-938 ◽  
Author(s):  
Paulmony Tharmaraj ◽  
Deivasigamani Kodimunthiri ◽  
Clarence Sheela ◽  
Shanmuga Priya
Keyword(s):  
Antimicrobial Activity ◽  
Metal Complexes ◽  
Free Ligand ◽  
Esr Spectra ◽  
Octahedral Geometry ◽  
Diffusion Method ◽  
Spectral Studies ◽  
Conductivity Measurements ◽  
Hydrazone Ligand ◽  
Square Planar

A new series of Cu(II), Co(II) and Ni(II) complexes with the 1-(2- -hydroxyphenyl)-3-phenyl-2-propen-1-one, N2-[(3,5-dimethyl-1H-pyrazol-1- -yl)methyl]hydrazone ligand, C21H22N4O (LH), were synthesized by the reaction of 1-(2-hydroxyphenyl)-3-phenyl-2-propen-1-one, hydrazone with (3,5-dimethyl- 1H-pyrazol-1-yl)methanol and characterized. The nature of the bonding and geometry of the complexes were deduced from elemental analysis, IR, electronic and 1H-NMR spectroscopy, and magnetic susceptibility and conductivity measurements. The studies indicated square-planar, tetrahedral and octahedral geometry for the copper(II), cobalt(II) and nickel(II) complexes, respectively. The ESR spectra of the copper(II) complex in acetonitrile at 300 and 77 K were recorded and their salient features are reported. The electrochemical behavior of the copper (II) complex was studied by cyclic voltammetry. The antimicrobial activity of the ligand and its metal complexes were studied against the following strains of microorganism: Staphylococcus aureus, Salmonella enterica typhi, Escherichia coli and Bacillus subtilis by the well diffusion method. Metal complexes showed enhanced antimicrobial activity compared with that of the free ligand.

scholarly journals Synthesis and Characterization of Some Group 12 Metal Complexes with Tellurium Containing 10-Membered Tetraazamacrocyclic Ligands

2011 ◽  
Vol 8 (3) ◽  
pp. 1158-1163
Author(s):  
Nitu ◽  
K. K. Verma
Keyword(s):  
Metal Complexes ◽  
Spectral Studies ◽  
Conductivity Measurements ◽  
Metal Chlorides ◽  
Group 12 ◽  
Elemental Analyses ◽  
Physicochemical Studies ◽  
Tetraazamacrocyclic Ligands ◽  
Pmr Spectra

A new series of 10-membered tellurium containing tetraazamacrocyclic complexes, [ML1Cl2], [ML2Cl2] and [ML3Cl2], where [M=Zn(II), Cd(II), Hg(II); L1, L2and L3=10-membered tellurium containing tetraazamacrocyclic ligands] have been prepared via the template condensation of ethylenediamine and diaryltellurium dichlorides, R2TeCl2, (R=p-hydroxyphenyl, 3-methyl-4-hydroxyphenyl,p-methoxyphenyl) in the presence of metal chlorides. These complexes have been characterized by elemental analyses, conductivity measurements, infrared, electronic absorption and proton magnetic resonance spectral studies. IR and PMR spectra confirm the formation of 10-membered tetraazamacrocycle skeleton and their tetradentate nature. An octahedral geometry has been assigned to all the metal complexes on the basis of various physicochemical studies.

scholarly journals Preparation and Characterization of Di-, Tri-, and Tetranuclear Schiff Base Complexes Derived from Diamines and 3,4-Dihydroxybenzaldehyde

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Ahlam Jameel Abdulghani ◽  
Asmaa Mohammed Noori Khaleel
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Copper Complex ◽  
Condensation Reaction ◽  
Magnetic Moments ◽  
Thermal Analyses ◽  
Schiff Base Complexes ◽  
Conductivity Measurements ◽  
Elemental Analyses

A series of new di-, tri-, and tetranuclear Co(II) and Cu(II) complexes of three new diSchiff base ligands were synthesized by two different methods. The first method involved the synthesis of the three ligands from condensation reaction of 3,4-dihydroxybenzaldehyde (L′H2) with ethylenediamine (en), o-phenylenediamine (o-PD), or 4,5-dimethyl-1,2-phenylendiamine (DMPD) in a mole ratio of 2 : 1 followed by the reaction of the resulting Schiff bases ligands with Cu(II) or Co(II) ions in the presence of 2,2′-bipyridyl (L) to form the di- and trinuclear metal complexes. The second method involved the condensation of the copper complexLCu(II)L′(L = 2,2′-bipyridyl, L′ = 4-formylbenzene-1,2-bis(olate)) with en, o-PD, or DMPD in a mole ratio of 2 : 1, respectively, followed by reaction with CuCl2or Cu(ClO4)2to form di-, tri-, and tetranuclear copper (II) complexes, respectively. The structures of the ligands and metal complexes were characterized by elemental analyses, NMR, and FTIR spectra. The geometries of metal complexes were suggested according to elemental analysis, electronic spectra, thermal analyses, atomic absorption, and magnetic moments and conductivity measurements.

Metal complexes of tridentate hybrid ligands. I. Cobalt and nickel conlplexes of ligands containing the donor sequence As-N-O

1969 ◽  
Vol 22 (11) ◽  
pp. 2315 ◽  
Author(s):  
B Chiswell ◽  
KW Lee
Keyword(s):  
Metal Complexes ◽  
Electronic Spectra ◽  
Weak Field ◽  
Magnetic Data ◽  
Conductivity Measurements ◽  
Hybrid Ligands ◽  
Cobalt And Nickel

The interaction of the new tridentate ?hybrid? ligand, N-o- dimethylarsino-phenylsalicylaldimine (As-N-O), with cobalt(II) salts leads to the formation of cationic octahedral cobalt(III) complexes of the type [Co(As-N-O)2]+. No cobalt(II) complex entities containing the ligand could be isolated. With nickel(II) salts three types of octahedral complexes were obtained: (a) [Ni(As-N-O)2],H2O, (b) Ni(As-N- O)X,-xH2O (X = Cl, Br, or NCS), (c) [Ni2(As-N-O)3ClO4]. Electronic spectra, conductivity measurements, and magnetic data have been used to determine the structure of the complexes isolated. The ?hybrid? ligand appears to operate overall as a relatively weak field ligand.

scholarly journals Spectroscopic, thermal and antibacterial studies on Mn(II) and Co(II) complexes derived from thiosemicarbazone

2009 ◽  
Vol 74 (8-9) ◽  
pp. 907-915 ◽  
Author(s):  
Sulekh Chandra ◽  
Monika Tyagi ◽  
Moamen Refat
Keyword(s):  
Magnetic Susceptibility ◽  
Thermogravimetric Analysis ◽  
Metal Complexes ◽  
Thermal Studies ◽  
Free Ligand ◽  
Antibacterial Properties ◽  
Molar Conductance ◽  
Octahedral Geometry ◽  
Spectral Studies ◽  
Antibacterial Studies

Mn(II) and Co(II) complexes having the general composition [M(L)2X2] (where L = 2-pyridinecarboxaldehyde thiosemicarbazone, M = Mn(II) and Co(II), X = Cl- and - NO3 ) were synthesized. All the metal complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, mass, IR, EPR, electronic spectral studies and thermogravimetric analysis (TG). Based on the spectral studies, an octahedral geometry was assigned for all the complexes. Thermal studies of the compounds suggest that the complexes are more stable than the free ligand. This fact was supported by the kinetic parameters calculated using the Horowitz-Metzger (H-M) and Coats-Redfern (C-R) equations. The antibacterial properties of the ligand and its metal complexes were also examined and it was observed that the complexes are more potent bactericides than the free ligand.

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