scholarly journals New complexes of Co(II), Ni(II), Cu(II) with Schiff base N,N’-bis-(3-methoxy-saliciliden)-3,3’-dimethylbenzidine

2013 ◽  
Vol 78 (7) ◽  
pp. 947-957 ◽  
Author(s):  
Ionela Alan ◽  
Angela Kriza ◽  
Olguta Dracea ◽  
Nicolae Stanica
Keyword(s):  
Schiff Base ◽  
Thermogravimetric Analysis ◽  
Spectral Data ◽  
Elemental Analysis ◽  
Room Temperature ◽  
Magnetic Moments ◽  
Magnetic Behaviour ◽  
Molar Ratio ◽  
Square Planar ◽  
Perchlorate Complex

The new N,N?-bis-(3-methoxy-saliciliden)-3,3?-dimetilbenzidine (H2L) Schiff base and complexes with Co(II), Ni(II) and Cu(II) of type [M(HL)Cl(H2O)] (M=Co(II), Cu(II)) [M2L(H2O)4]X2 (M=Co(II), X=ClO4 and M=Cu(II), X=NO3) and [M2L(CH3COO)2] (M=Co(II), Ni(II), Cu(II)) were synthesised. The ligand and complexes were characterized by elemental analysis, conductibility measurements, magnetic moments at room temperature, IR, NMR, UV-VIS-NIR, EPR spectra and thermogravimetric analysis. A molar ratio of 1:1 or 1:2 between ligand and metal was determined from the elemental analysis. Except for perchlorate complex that behave as electrolyte, the rest of complexes are non-electrolytes. The spectral data suggest a tetrahedral, pseudo-tetrahedral or square-planar stereochemistry respectively, data confirmed by magnetic behaviour of complexes. The antimicrobial tests indicate a fungicide effect both for ligand and complexes.

scholarly journals Metal Complexes of N-hydroxyethylnaphthalideneimine Schiff Base

1972 ◽  
Vol 27 (3) ◽  
pp. 304-307 ◽  
Author(s):  
R. K. Mehta ◽  
V. C. Singhi
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Spectral Data ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Complex Molecule ◽  
Square Planar ◽  
Distorted Octahedral ◽  
Solid Complexes ◽  
Octahedral Configuration

The Schiff base, N-hydroxyethylnaphthalideneimine forms solid complexes with Mn (II) , Co (II), Ni (II), Cu (II), Zn (II), Cd (II), Pd (II) and UO2 (II). The structures of these compounds have been discussed on the basis of their elemental analysis, magnetic moment values and electronic spectral data. These studies have conclusively proved that UO2 (II) and Mn (II) complexes are octahedral in shape whereas the Cu (II) complex molecule displays a square planar or tetragonally distorted octahedral configuration. Co (II) , Ni (II) , Zn (II) and Cd (II) complexes are tetrahedral in structures while the Pd (II) compound is square planar.

scholarly journals Preparation, Study and Theortical Treatment of Co(II) Ni(II) Cu(II) and Zn(II) Schiff Base Coplexes with Sodium [N-(hydroxyl naphtholidine) Glycine imino].

2012 ◽  
Vol 9 (4) ◽  
pp. 608-615
Author(s):  
Baghdad Science Journal
Keyword(s):  
Schiff Base ◽  
Amino Acid ◽  
Elemental Analysis ◽  
Magnetic Moments ◽  
Molar Conductivity ◽  
Molar Ratio ◽  
Conductivity Measurements ◽  
Molar Ratios ◽  
Tridentate Schiff Base ◽  
Amino Acid Glycine

Anew Schiff base (NaHL) has been prepared from the reaction between the salt of amino acid glycine with 2-hydroxy naphthaldehyde. By tridentate Schiff base of (ONO), donors were characterized by using U.V and spectrophotometer techniques. Complexes of Co(II) Ni(II) Cu(II) and Zn(II) ion with the ligand have been prepared, these complexes were identified by infrared, electronic spectral data, elemental analysis, magnetic moments, and molar conductivity measurements. It is concluded from the elemental analysis that all the complexes have (1:2) [metal:ligand] molar ratios, octahedral, with the exception to Zn(II) complex which have (1:1)[metal:ligand] molar ratio.

scholarly journals Synthesis, Characterization, and Electrochemical Behaviour of Cobalt(II) and Nickel(II) Complexes with N2O2 Chelating Ligand 4,4′-(Biphenyl-4,4′-diyldinitrilo)dipentan-2-one

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Lakhdar Sibous ◽  
Embarek Bentouhami ◽  
Mustayeen Ahmed Khan
Keyword(s):  
Schiff Base ◽  
Mass Spectroscopy ◽  
Elemental Analysis ◽  
Electrochemical Behaviour ◽  
Absolute Ethanol ◽  
Molar Ratio ◽  
H Nmr ◽  
Chelating Ligand ◽  
Metal Ligand

4,4′-Diaminobiphenyl reacts with 2,4-pentanedione in absolute ethanol in a molar ratio 1 : 2 to form mainly the product of [1 + 2] condensation, 4,4′-(biphenyl-4,4′-diyldinitrilo)dipentan-2-one (H2L). The Schiff base was used as tetradentate chelating ligand to coordinate CoII and NiII chlorides leading to complexes where the ratio of metal ligand was found to be 2 : 1 or 2 : 2. All the synthesized products were characterized by elemental analysis, infrared, electronic, and mass spectroscopy, 1H NMR, and DSC. The electrochemical behaviour of the ligand and its complexes in DMF is also investigated.

scholarly journals Syntheses, Characterization, Crystal Structures and Antimicrobial Activity of Schiff Base Copper(II) Complexes Derived from 2-Bromo-6-((2-(isopropylamino) ethylimino)methyl)phenol

2021 ◽  
Vol 68 (4) ◽  
pp. 1008-1015
Author(s):  
Yong Yuan ◽  
Xi-Kun Lu ◽  
Gao-Qi Zhou ◽  
Xiao-Yang Qiu
Keyword(s):  
Antimicrobial Activity ◽  
Schiff Base ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Structure Determination ◽  
Antimicrobial Activities ◽  
X Ray ◽  
Zwitterionic Form ◽  
Square Planar ◽  
Vis Spectroscopy

Three new copper(II) complexes, [Cu(LH)2]Br2 (1), [Cu(LH)2]NCS2 (2), and [Cu(LH)2](NO3)2 (3), where LH is the zwitterionic form of 2-bromo-6-((2-(isopropylamino)ethylimino)methyl)phenol (HL), were synthesized and characterized by elemental analysis, IR and UV-vis spectroscopy. The structures of the complexes were further confirmed by single crystal X-ray structure determination. All compounds are mononuclear copper(II) complexes. The Cu atoms in the complexes are coordinated by two imino N and two phenolate O atoms from two LH ligands, forming square planar coordination. The compounds were assayed for their antimicrobial activities.

scholarly journals Zr(IV), La(III), and Ce(IV) Chelates with 2-[(4-[(Z)-1-(2-Hydroxyphenyl)ethylidene]aminobutyl)-ethanimidoyl]phenol: Synthesis, Spectroscopic Characterization, and Antimicrobial Studies

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
M. M. El-ajaily ◽  
H. A. Abdullah ◽  
Ahmed Al-janga ◽  
E. E. Saad ◽  
A. A. Maihub
Keyword(s):  
Schiff Base ◽  
Spectral Data ◽  
Schiff Base Ligand ◽  
Active Sites ◽  
Antimicrobial Agents ◽  
Spectroscopic Characterization ◽  
Metal Chelates ◽  
Molar Ratio ◽  
Bacterial Strains ◽  
Activity Data

La(III), Zr(IV), and Ce(IV) chelates of 2-[(4-[(Z)-1-(2-hydroxyphenyl)ethylidene]aminobutyl)-ethanimidoyl]phenol were synthesized and characterized by using several physical techniques. The Schiff base was obtained by refluxing of o-hydroxyacetophenone with 1,4-butanediamine in 2 : 1 molar ratio. The CHN elemental analysis results showed the formation of the Schiff base and the chelates has been found to be in 1 : 1 [M : L] ratio. The molar conductance measurements revealed that all the chelates are nonelectrolytes. Structural elucidations of the ligand and its chelates were based on compatible analytical and spectroscopic evidences. The infrared spectral data revealed that the Schiff base coordinates to the metal ions through active sites which are –OH and –C=N groups. According to the electronic spectral data, an octahedral geometry was proposed for the chelates. The synthesized ligand and its metal chelates were screened for their antimicrobial activity against two Gram negative (Escherichia coli, Salmonella kentucky) and two Gram positive (Lactobacillus fermentum, Streptococcus faecalis) bacterial strains, unicellular fungi (Fusarium solani), and filamentous fungi (Aspergillus niger). The activity data showed that the metal chelates have antibacterial and antifungal activity more than the parent Schiff base ligand against one or more bacterial or fungi species. The results also indicated that the metal chelates are higher sensitive antimicrobial agents as compared to the Schiff base ligand.

The anomalous paramagnetism of iron(III) NN-dialkyldithiocarbamates

1964 ◽  
Vol 17 (3) ◽  
pp. 294 ◽  
Author(s):  
AH White ◽  
R Roper ◽  
E Kokot ◽  
H Waterman ◽  
RL Martin
Keyword(s):  
Molecular Weight ◽  
Thermal Equilibrium ◽  
Room Temperature ◽  
Chemical Nature ◽  
Magnetic Moments ◽  
Chloroform Solution ◽  
Exchange Interactions ◽  
Magnetic Behaviour ◽  
Antiferromagnetic Exchange ◽  
Molecular Type

The magnetic moments of a series of 19 NN-disubstituted dithiocarbamates of iron(III), [Fe(S2C.NR?R")3], are anomalous in that their behaviour is neither "high-" nor "low-spin". Values of μeff. at room temperature lie between 2.62 and 5.83 B.M., the datum for each compound depending on the chemical nature of the substituents R' and R". This anomalous situation persists in benzene or chloroform solution. Cryoscopic and ebullioscopic molecular weight determinations establish that all the compounds are monomeric, which excludes the possibility that the magnetic behaviour arises from the presence of antiferromagnetic exchange interactions of either the inter- or intra-molecular type. These observations strongly support the early and generally overlooked work of Cambi who in 1932 proposed a thermal equilibrium between "magnetic isomers" of spins S = � and S = 5/2 to account for the origin of the magnetic anomaly.

Polyamine ligands. I. The stereochemistry of transition metal complexes with the ligand 1,8-Bis(2'-pyridyl)-3,6-diazaoctane

1970 ◽  
Vol 23 (3) ◽  
pp. 491 ◽  
Author(s):  
AT Phillip ◽  
AT Casey ◽  
CR Thompson
Keyword(s):  
Transition Metal Complexes ◽  
Metal Ion ◽  
Electronic Absorption Spectra ◽  
Magnetic Moments ◽  
Temperature Dependent ◽  
Physical Measurements ◽  
Square Planar ◽  
First Time ◽  
Perchlorate Complex ◽  
Complex Ion

The new polyamine ligand 1,8-bis(2'-pyridyl)-3,6-diazaoctane has been synthesized for the first time by the reaction between 2-vinylpyridine and ethyl-enediamine. The ligand could not be distilled without decomposition and hence it was purified by converting it into the crystalline copper(11) perchlorate complex, from which the ligand was liberated by the reaction with sodium sulphide solution. The pure ligand was obtained in an overall yield of 28%, based on starting materials. The complexes formed by the ligand with the metal ions copper(11), nicke1(11), palladium(11), zinc(11), and cobalt(111) were isolated and characterized by physical measurements of their conductance in solution, magnetic moments, infrared and electronic absorption spectra. The ligand adopts the planar-N4 configuration around the metal ion in the complexes with copper(11), nicke1(11), and palladiurn(11), whereas it probably adopt's a tetrahedral-N4 configuration around the zinc(11) complex ion. The nickel(11) perchlorate complex is diamagnetic in the solid state and it most likely contains the metal ion in square-planar cordination. When dissolved in coordinating solvents, this complex undergoes a reversible, temperature-dependent equilibrium between diamagnetic and solvated, paramagnetic forms.

scholarly journals Synthesis, characterization and antimicrobial studies of Mn(II) complexes of acetylthiophene and acetyl furan Schiff base derivatives

2020 ◽  
Vol 12 (1) ◽  
pp. 251-258
Author(s):  
S. Isyaku ◽  
H.N. Aliyu ◽  
E.C. Ozoro ◽  
T. Abubakar
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Schiff Bases ◽  
Elemental Analysis ◽  
Salmonella Typhi ◽  
Decomposition Temperature ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Azomethine Nitrogen ◽  
Antimicrobial Studies

Manganese(II) complexes of Schiff bases; 2-acetylthiophene-4‑phenylthiosemi-carbazone (AT-PTSC) and 2-furylmethylketone-4-phenylthiosemi-carbazone  (AF‑PTSC) derived from condensation of 2-acetylthiophene and 2-furylmethylketone (2-acetylfuran) each with 4-phenylthiosemicarbazide in (1:1 molar ratio) ethanol, have been synthesized. The Schiff bases and the Mn(II) complexes were characterized on the basis of melting point/decomposition temperature, solubility, magnetic susceptibility, infrared spectra, molar conductance measurements,  elemental and gravimetric  analyses. The Mn(II) complexes show moderate values of decomposition temperatures. The Schiff bases and the complexes were soluble in some common organic solvents. Infrared spectral data of the Schiff bases and their complexes, indicate coordination of the Schiff bases to the metal(II) ion via azomethine nitrogen. The effective magnetic moment of the Mn(II) complexes suggested an octahedral geometry. The molar conductance values of the complexes show that the complexes are electrolytes. The results of the elemental analysis of the ligands and their complexes are in good agreement with the calculated values, suggesting a 1:2 (metal-ligand) ratio. Antimicrobial screenings of the ligands and their complexes were conducted against gram-positive (Staphylococcus aureus,) and two gram-negative (Salmonella typhi, and Escherichia coli) bacteria specie. Also three fungi mainly (Candida albicans, Mucus indicus and Aspergillus flavus) were tested. The results showed that both the ligands and the complexes are active against the bacteria and the fungi specie. Keywords: Ligand, Schiff base, 4-phenylthiosemicarbazide, 2-acetylthiophene, 2-acetylfuran molar conductivity, magnetic susceptibility, elemental analysis.

scholarly journals Spectral and Biological Studies: Co(II), Ni(II), Cu(II), Zn(II) and Pd(II) Complexes of 5-Methyl-4-{(3-fluoro-4-methoxybenzylidiene)amino}-3-thiol-1,2,4-triazole

2020 ◽  
Vol 32 (12) ◽  
pp. 3157-3164
Author(s):  
Kiran Singh ◽  
Preeti Siwach ◽  
Amit Sharma
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Elemental Analysis ◽  
Magnetic Measurements ◽  
Biological Activities ◽  
Palladium Complexes ◽  
Square Planar ◽  
Biological Studies ◽  
Nmr Techniques

A series of metal-complexes of Co2+, Ni2+, Cu2+, Zn2+ and Pd2+ with new Schiff base named 5-methyl-4-((3-fluoro-4-methoxybenzylidiene)-amino)-3-thiol-s-triazole have been synthesized and characterized. Schiff base is formed by the condensation of 3-fluoro-4-methoxy-benzaldehyde and 4-amino-3-mercapto-5-methyl-1,2,4-triazoles (AMMT). After synthesis, Schiff base is characterized by IR and NMR techniques. Metal complexes are characterized by different techniques as IR, NMR, ESR, electronic and fluorescence. Elemental analysis and magnetic measurements of metal complexes have also been carried out. Using different techniques, tentative geometry for newly synthesized complexes have been proposed i.e. square planar for copper and palladium complexes and octahedral for rest of the metal complexes. The biological activities of all the metal complexes of this series are also examined.

scholarly journals Synthesis, Characterization, and Antibacterial Activity of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) Complexes of Schiff's Base Type Ligands Containing Benzofuran Moiety

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
N. Shashidhar Reddy ◽  
B. S. Shankara ◽  
P. Murali Krishana ◽  
C. Basavaraj ◽  
B. Mahesh
Keyword(s):  
Antibacterial Activity ◽  
Metal Ions ◽  
Spectral Data ◽  
General Formula ◽  
Elemental Analysis ◽  
Magnetic Moments ◽  
Good Activity ◽  
Schiff’S Base ◽  
Elemental Data ◽  
Cu Complexes

Six new complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II) with substituted benzofuran derivatives have been synthesized and characterized by elemental analysis, magnetic moments, conductance measurements, spectral characterization, and so forth. Elemental data coincide with the general formula MLC1n, where L = (E)-7-Methoxy-N1-(2,4,5-trimethoxy benzylidene) benzofuran-2-carbohydrazide (L1) or (E)-N1-(2,6-dichloro benzylidene)-7-methoxy benzofuran-2-carbohydrazide (L2), of the complexes. The ligands coordinate to the metal ions through the oxygen of the carbonyl group and the nitrogen of the hydrazine group. Electronic spectral data of the complexes suggests the probable geometry is octahedral in nature. All the complexes and ligands were screened for their antibacterial activity. Among them, Co, Ni, and Cu complexes of L2 showed good activity against all microbes.

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