scholarly journals Synthesis, Characterization and Biological Activities of Cu(II), Co(II), Ni(II), Mn(II) and Fe(III) Complexes with Schiff Base Derived from 3-(4-Chlorophenoxymethyl)-4-amino-5-mercapto-1,2,4-triazole

2008 ◽  
Vol 5 (3) ◽  
pp. 529-538 ◽  
Author(s):  
Vidyavati Reddy ◽  
Nirdosh Patil ◽  
Tukaram Reddy ◽  
S. D. Angadi
Keyword(s):  
Schiff Base ◽  
Biological Activities ◽  
Antibacterial Activities ◽  
Coordination Complexes ◽  
Spectroscopic Studies ◽  
Bidentate Ligand ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
H Nmr ◽  
Physicochemical Data

Coordination complexes of Cu(II),Co(II), Ni(II), Mn(II) and Fe(III)with Schiff bases derived from 3-(4-chlorophenoxymethyl)-4-amino-5-mercapto-1, 2, 4-triazole and substituted aldehydes have been synthesized. The complexes were characterized by elemental analysis, conductivity measurements, magnetic susceptibility data, electronic, IR, ESR and1H NMR spectral data. On the basis spectroscopic studies, the Schiff base is monobasic bidentate ligand having the composition ML2(2H2O) Where M = Cu(II), Co(II), Ni(II) ,Mn(II), ML2(H2O)Cl Where M = Fe(III). Various physicochemical data suggest a six coordinated octahedral geometry for Cu(II),Co(II), Ni(II), Mn(II) and Fe(III) complexes. The antibacterial activities of ligand and its complexes were screened by cup plate method.

scholarly journals Coordination Modes of a Schiff Base Derived from Substituted 2-Aminothiazole with Chromium(III), Manganese(II), Iron(II), Cobalt(II), Nickel(II) and Copper(II) Metal Ions: Synthesis, Spectroscopic and Antimicrobial Studies

2011 ◽  
Vol 8 (4) ◽  
pp. 1750-1764 ◽  
Author(s):  
Ambit Thakar ◽  
Krishnakant Joshi ◽  
Kishor Pandya ◽  
Arvind Pancholi
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Transition Metal Complexes ◽  
Mass Spectra ◽  
Antibacterial Activities ◽  
Molar Conductance ◽  
Spectral Techniques ◽  
H Nmr ◽  
Antimicrobial Studies ◽  
C Nmr

Transition metal complexes of Cr(III), Mn(II), Fe(II), Co(II), Ni(II) and Cu(II) metal ions with general stoichiometry [ML2.2H2O] and [ML3], where M= Mn(II), Cr(III), Fe(II), Co(II), Ni(II) and Cu(II), L= Schiff base derived from the condensation of 2-amino-4(4’-phenyl/methylphenyl)-5-methyl-thiazole with 4-acetyl-1(3-chloro phenyl)-3-methyl-2-pyrazoline-5-ones, have been synthesized and structurally characterized by elemental analysis, molar conductance measurements, magnetic susceptibility measurements and spectral techniques like IR, UV,1H NMR,13C NMR and Mass Spectra. All the complexes were found to be octahedral geometry. The ligand and its complexes have been screened for their antifungal and antibacterial activities against three fungi,i.e. Alternaria brassicae, Aspergillus nigerandFesarium oxysporumand two bacteria,i.e. Xanthomonas compestrisandPseudomonas aeruginosa.

HIGH-TEMPERATURE OXIDE SUPERCONDUCTORS: STRUCTURE, STOICHIOMETRY AND THE MECHANISM OF SUPERCONDUCTIVITY

1987 ◽  
Vol 01 (03n04) ◽  
pp. 721-732 ◽  
Author(s):  
C.N.R. RAO
Keyword(s):  
Magnetic Susceptibility ◽  
Spectroscopic Studies ◽  
Oxide Superconductors ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
High Temperature Oxide ◽  
Temperature Oxide ◽  
Mechanism Of Superconductivity ◽  
Superconducting Oxides

Magnetic susceptibility data show La2CuO4 to be antiferromagnetic. Oxides of the K2NiF4 structure of the general formula (La1−y Lny)2−x Srx(Bax)CuO4 show superconductivity in the 15-40K range, the Tc becoming maximum at a specific value of x or of the a-parameter. Superconductivity in La3−xBa3+xCu6O14 and La4−xBa1+xCu5O13 systems has been investigated besides that in the Y-Ba-Cu-O system. Role of oxygen in the superconductivity of YBa2Cu3O7−δ is discussed. The problem of rationalizing macro and microstructures of YBa2Cu3O7−δ is indicated. Infrared spectra of the superconducting oxides and their marginal metallicity in the normal state are examined. Based on electron spectroscopic studies, it is shown that holes are likely to be on oxygen rather than on copper, giving rise to peroxide-like species; Copper is present in the 1+ state (besides the 2+ state).

Recent reports on Pyridoxal derived Schiff base complexes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Samik Gupta
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Vitamin B6 ◽  
Biological Activities ◽  
Coordination Complexes ◽  
Aldehyde Group ◽  
Schiff Base Complexes ◽  
Fine Chemicals ◽  
Active Core ◽  
Insight Into

Abstract Pyridoxal and Pyridoxal 5-phosphate are two among the six aqua soluble vitamers of vitamin B6. They can form Schiff bases readily due to the presence of aldehyde group. Schiff bases can offer diverse coordination possibilities for many transition metals as has been found in a large volume of research till now. The coordination complexes thus formed gives insight into the active core structure and enzymatic activities of vit B6 containing enzymes. Apart from that, these complexes have been found useful as catalysts for synthesis of fine chemicals, as sensors and for their diverse biological activities.

scholarly journals Synthesis, characterization and crystal structures of the bidentate Schiff baseN,N′-bis(2-nitrocinnamaldehyde)ethylenediamine and its complex with CuNCS and triphenylphosphane

2015 ◽  
Vol 71 (7) ◽  
pp. 578-583 ◽  
Author(s):  
William Clegg ◽  
Ross W. Harrington ◽  
Kazem Barati ◽  
Mohammad Hossein Habibi ◽  
Morteza Montazerozohori ◽  
...  
Keyword(s):  
Schiff Base ◽  
Nmr Spectroscopy ◽  
Nitro Group ◽  
Bidentate Ligand ◽  
Molar Ratio ◽  
X Ray ◽  
X Ray Crystallography ◽  
H Nmr ◽  
Bite Angle ◽  
Elemental Analyses

Reaction of copper(I) thiocyanate and triphenylphosphane with the bidentate Schiff baseN,N′-bis(trans-2-nitrocinnamaldehyde)ethylenediamine {Nca2en, (1); systematic name (1E,1′E,2E,2′E)-N,N′-(ethane-1,2-diyl)bis[3-(2-nitrophenyl)prop-2-en-1-imine]}, C20H18N4O4, in a 1:1:1 molar ratio in acetonitrile resulted in the formation of the complex {(1E,1′E,2E,2′E)-N,N′-(ethane-1,2-diyl)bis[3-(2-nitrophenyl)prop-2-en-1-imine]-κ2N,N′}(thiocyanato-κN)(triphenylphosphane-κP)copper(I)], [Cu(NCS)(C20H18N4O4)(C18H15P)] or [Cu(NCS)(Nca2en)(PPh3)], (2). The Schiff base and copper(I) complex have been characterized by elemental analyses, IR, electronic and1H NMR spectroscopy, and X-ray crystallography [from synchrotron data for (1)]. The molecule of (1) lies on a crystallographic inversion centre, with atransconformation for the ethylenediamine unit, and displays significant twists from coplanarity of its nitro group, aromatic ring, conjugated chain and especially ethylenediamine segments. It acts as a bidentate ligand coordinatingviathe imine N atoms to the CuIatom in complex (2), in which the ethylenediamine unit necessarily adopts a somewhat flattenedgaucheconformation, resulting in a rather bowed shape overall for the ligand. The NCS−ligand is coordinated through its N atom. The geometry around the CuIatom is distorted tetrahedral, with a small N—Cu—N bite angle of 81.56 (12)° and an enlarged opposite angle of 117.29 (9)° for SCN—Cu—P. Comparisons are made with the analogous Schiff base having no nitro substituents and with metal complexes of both ligands.

Ammine adduct and Schiff base formation in the copper(II) 1,1,1,5,5,5-Hexafluoropentane-2,4-dione-ammonia system

1981 ◽  
Vol 34 (11) ◽  
pp. 2455
Author(s):  
MW Anker ◽  
JH Moffett ◽  
NT Moxon ◽  
AK Gregson
Keyword(s):  
Schiff Base ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Schiff Base Complex ◽  
Chain Model ◽  
Heisenberg Chain ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Schiff Base Formation ◽  
Base Formation

1,1,1,5,5,5-Hexafluoropentane-2,4-dione (Hhfa) reacts with ammoniacal solutions of copper(II) salts at room temperature to form the ammine adducts Cu(hfa)2,NH3 and Cu(hfa)2,2NH3, and at elevated temperatures or on standing to form the Schiff base complex Cu(hfacim)2 (Hhfacim = 1,1,1,5,5,5-hexafluoro-4-aminopentan-2-one) The magnetic susceptibility data for Cu(hfacim)2 suggest the presence of exchange interaction and is best explained by using a S = � Heisenberg chain model with J=-0.18 cm-1.

scholarly journals Five-Coordinate Zinc(II) Complex: Synthesis, Characterization, Molecular Structure, and Antibacterial Activities of Bis-[(E)-2-hydroxy-N′-{1-(4-methoxyphenyl)ethylidene}benzohydrazido]dimethylsulfoxidezinc(II) Complex

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Zhi-Qiang Liu ◽  
Yoke Mooi Ng ◽  
Pei Jen Tiong ◽  
Ruwaida Asyikin Abu Talip ◽  
Nornadia Jasin ◽  
...  
Keyword(s):  
Schiff Base ◽  
Dmso Molecule ◽  
Antibacterial Activities ◽  
Bidentate Ligand ◽  
Ethanol Solution ◽  
Metal Center ◽  
Diffusion Method ◽  
Spectral Studies ◽  
X Ray Diffraction ◽  
Vis Spectroscopy

The titled Zn(II) complex was synthesized by reacting the compound (E)-2-hydroxy-N′-{1-(4-methoxyphenyl)ethylidene}benzohydrazide with zinc(II) acetate dihydrate in alkaline DMSO and ethanol solution under reflux condition for 28 hours. The resulting solid was filtered and recrystallized from the mixture of ethanol and DMSO. The hydrazone Schiff base and its Zn(II) complex were characterized using 1H, 13C NMR, FTIR, UV-Vis spectroscopy, and single crystal X-ray diffraction analysis. Meanwhile, their antibacterial activities were examined using disc diffusion method. The spectral studies showed that the hydrazone Schiff base underwent keto-enol tautomerization, forming a bidentate ligand (N,O) towards Zn(II) ion. Surprisingly, on top of the two hydrazone Schiff base molecules which coordinated to the Zn metal center, an additional DMSO molecule was found attached to the Zn metal center in the crystal data, resulting in a 5-coordinate distorted trigonal bipyramidal Zn(II) complex. Both hydrazone Schiff base and its Zn(II) complexes were found to exhibit low antibacterial activity even when the concentrations were increased to 800 ppm.

scholarly journals Preparation and spectroscopic studies of Fe(II), Ru(II), Pd(II) and Zn(II) complexes of Schiff base containing terephthalaldehyde and their transfer hydrogenation and Suzuki-Miyaura coupling reaction

2019 ◽  
Vol 17 (1) ◽  
pp. 571-580 ◽  
Author(s):  
Nevin Turan ◽  
Kenan Buldurun ◽  
Naki Çolak ◽  
İsmail Özdemir
Keyword(s):  
Schiff Base ◽  
Coupling Reaction ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Transfer Hydrogenation ◽  
Spectroscopic Techniques ◽  
Catalytic Activities ◽  
H Nmr ◽  
Optimized Conditions ◽  
C Nmr

AbstractThis study describes synthesis, spectroscopic characterization and catalytic activities of Fe(II), Ru(II), Pd(II) and Zn(II) complexes with a novel Schiff base ligand (L) derived from methyl 2-amino-5,5,7,7-tetramethyl-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate and terephthalaldehyde. We used spectroscopic techniques including IR, UV-Vis, 1H-NMR, 13C-NMR, elemental analysis and also mass analysis and magnetic susceptibility measurements to identify the products. The Pd(II) complex was used as a potential catalyst for Suzuki-Miyaura coupling reaction of some aryl halides under optimized conditions. The effect of various bases such as NaOH, KOH, and KOBut was investigated in transfer hydrogenation (TH) of ketones by isopropyl alcohol as the hydrogen source. Ru(II) and Pd(II) complexes showed catalytic activity while Zn(II) and Fe(II) metal complexes failed to do that.

Coordination chemistry of thioether–pyridazine macrocycles II. Synthesis, structural and spectroscopic studies of dinuclear copper(II) and polynuclear copper(I) and silver(I) complexes of a tetrathiapyridazinophane macrocyclic ligand

1992 ◽  
Vol 70 (11) ◽  
pp. 2709-2716 ◽  
Author(s):  
Liqin Chen ◽  
Laurence K. Thompson ◽  
John N. Bridson
Keyword(s):  
Macrocyclic Ligand ◽  
Silver Ions ◽  
Spectroscopic Studies ◽  
Binuclear Complexes ◽  
Monoclinic System ◽  
Magnetic Susceptibility Data ◽  
Space Group ◽  
X Ray ◽  
X Ray Crystallography ◽  
Susceptibility Data

The preparation and properties of the thioether–pyridazine macrocycle (L3; C11H16N2S4) containing one pyridazine subunit, and its copper(II), copper(I), and silver(I) complexes are described. Magnetic susceptibility data (5–300 K) for the binuclear complexes [CuL3Cl2]2 (I) and [CuL3Br2]2 (II) have been fitted to the Friedberg magnetization expression with a molecular field correction. Intradimer antiferromagnetic exchange is weak (−2J < 18 cm−1), with even weaker interdimer exchange (−zJ′ < 0.3 cm−1). The complexes [CuL3Cl]x (III) and [AgL3ClO4]x (V) have been characterized by X-ray crystallography. III crystallizes in the triclinic system, space group [Formula: see text], with a = 9.410(2) Å, b = 10.291(2) Å, c = 9.208(2) Å, α = 108.56(1)°, β = 91.82(2)°, γ = 68.04(1)°, V = 780.1(2) Å3, and Z = 2(R = 0.035, Rw = 0.031 for 1856 reflections). The ligand acts as a bidentate, S2, bridge between dinuclear Cu2Cl2 units in a double stranded polymer. III crystallized in the monoclinic system, space group P21/n, with a = 9.382(4) Å, b = 19.274(4) Å, c = 10.190(3) Å, β = 106.35(3)°, V = 1768(1) Å3, and Z = 4 (R = 0.036, Rw = 0.029 for 1776 reflections). The structure consists of a polymeric, two dimensional sheet structure, involving pseudo-tetrahedral silver ions linked by exo-bidentate, S2, ligands and bidentate perchlorates.

scholarly journals Synthesis of New Schiff Base of 1,3-Oxazine and 1,3-Thiazine Derivatives Derived from 4-Phenyl Substituted Chalcones and Evaluation of their Antibacterial Activity

2021 ◽  
Vol 33 (3) ◽  
pp. 531-536
Author(s):  
Anupama Sharma ◽  
Sarita Khaturia ◽  
Har Lal Singh
Keyword(s):  
Schiff Base ◽  
Energy Gap ◽  
Biological Activities ◽  
Antibacterial Activities ◽  
Basis Set ◽  
Gram Negative Bacteria ◽  
Important Class ◽  
Lumo Energy ◽  
Homo Lumo

Oxazine and thiazine heterocycles have distinctive interests due to their important class of natural and non-natural products and exhibit high biological activities in the pharmaceutical and biological fields. This work was planned to synthesize Schiff base of 1,3-oxazine and 1,3-thiazine derivative from 4-phenyl substituted chalcones. The structures of the newly synthesized targeted compounds were established from UV, IR, 1H NMR, 13C NMR and DFT calculations. The molecular properties HOMO-LUMO energy, energy gap, softness and harness were calculated using DFT/B3LYP/6-311G (d,p) basis set. in vitro Antibacterial activities of Schiff bases of 1,3-oxazines and 1,3-thiazines derivatives were investigated against Gram-positive (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli) and compared with each other. It was found that thiazine derivatives showed higher activity.

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