scholarly journals Thermal, Spectral, Fluorescence, and Antimicrobial Studies of Cobalt, Nickel, Copper, and Zinc Complexes Derived from 4-[(5-Bromo-thiophen-2-ylmethylene)-amino]-3-mercapto-6-methyl-5-oxo-[1,2,4]triazine

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Kiran Singh ◽  
Yogender Kumar ◽  
Parvesh Puri ◽  
Chetan Sharma ◽  
Kamal Rai Aneja
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Magnetic Measurements ◽  
Analytical Data ◽  
Fluorescence Emission ◽  
Zinc Complexes ◽  
Planar Geometry ◽  
Cobalt Nickel ◽  
Copper And Zinc ◽  
Nickel Copper

A new series of cobalt, nickel, copper, and zinc complexes of bidentate Schiff base derived from the condensation of 5-bromothiophene-2-carboxaldehyde with 4-amino-3-mercapto-6-methyl-5-oxo-[1,2,4]triazine were synthesized. Physical (magnetic measurements, molar conductance, TG), spectral (UV-Vis, IR, 1HNMR, fluorescence, ESR), and analytical data have established the structures of synthesized Schiff base and its metal complexes. The presence of coordinated water in metal complexes was confirmed by IR and TG studies. The Schiff base exhibits a strong fluorescence emission, contrast to this partial fluorescence quenching phenomena is observed in its metal complexes. A square planar geometry for Cu(II) and octahedral geometry for Co(II), Ni(II) and Zn(II) complexes have been proposed. The Schiff base and its metal complexes have been screened for antibacterial (Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa) and antifungal activities (Aspergillus niger, A. flavus).

scholarly journals Metal-Based Biologically Active Compounds: Synthesis, Spectral, and Antimicrobial Studies of Cobalt, Nickel, Copper, and Zinc Complexes of Triazole-Derived Schiff Bases

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Kiran Singh ◽  
Yogender Kumar ◽  
Parvesh Puri ◽  
Chetan Sharma ◽  
Kamal Rai Aneja
Keyword(s):  
Metal Complexes ◽  
Schiff Bases ◽  
Antimicrobial Agents ◽  
Condensation Reaction ◽  
Zinc Complexes ◽  
Biologically Active ◽  
Planar Geometry ◽  
Cobalt Nickel ◽  
Copper And Zinc ◽  
Nickel Copper

A series of cobalt, nickel, copper, and zinc complexes of bidentate Schiff bases derived from the condensation reaction of 4-amino-5-mercapto-3-methyl/ethyl-1,2,4-triazole with 2,4-dichlorobenzaldehyde were synthesized and tested as antimicrobial agents. The synthesized Schiff bases and their metal complexes were characterized with the aid of elemental analyses, magnetic moment measurements, spectroscopic and thermogravimetric techniques. The presence of coordinated water in metal complexes was supported by infrared and thermal gravimetric studies. A square planar geometry was suggested for Cu(II) and octahedral geometry proposed for Co(II), Ni(II), and Zn(II) complexes. The Schiff bases and their metal complexes have been screened for antibacterial (Pseudomonas aeruginosa, Bacillus subtilis) and antifungal activities (Aspergillus niger, A. flavus). The metal complexes exhibited significantly enhanced antibacterial and antifungal activity as compared to their simple Schiff bases.

scholarly journals Synthesis, Spectral Characterization and Biological Evaluation of Schiff Base Metal Complexes Derived from Aniline Derivative

2019 ◽  
Vol 31 (9) ◽  
pp. 2095-2100
Author(s):  
P. Priya ◽  
S. Vedanayaki ◽  
P. Jayaseelan
Keyword(s):  
Schiff Base ◽  
Metal Complexes ◽  
Magnetic Measurements ◽  
Antioxidant Activities ◽  
Analytical Data ◽  
Biological Evaluation ◽  
Molar Conductance ◽  
Molar Ratio ◽  
Aniline Derivative ◽  
Schiff Base Metal Complexes

A new Schiff base ligand (L) N-(4-fluorophenyl)-1-(4-(((4-fluorophenyl)imino)methyl)phenyl)- methaninmine was prepared by the condensation of terephthalaldehyde with 4-fluoroaniline in 1:2 molar ratio. The mononuclear complexes of Co(II), Ni(II), Cu(II) and Zn(II) (1-4) have been synthesized in (2:1) ligand to metal ratio. The composition, geometry and binding sites of ligand with metal complexes were evidenced by various spectral methods like molar conductance, elemental analytical data, magnetic measurements, UV-visible, 1H & 13C NMR, ESI-MS, FT-IR, ESR and thermal analysis. The above studies shows that the ligand is a bidentate and its metal complexes possess an octahedral geometry. Oxidative cleavage of DNA studies of the complexes were monitored by super helix PUC18DNA using a method of agarose gel electrophoresis. Ligand and its metal complexes were screened against gram positive (Staphylococcus aureus), gram negative (Klebsiella pneumoniae) bacterium and fungus (Candida albicans) strains. Antioxidant activities of the metal complexes possess greater activity than ligand.

scholarly journals Antimicrobial, spectral and thermal studies of divalent cobalt, nickel, copper and zinc complexes with triazole Schiff bases

2017 ◽  
Vol 10 ◽  
pp. S978-S987 ◽  
Author(s):  
Kiran Singh ◽  
Yogender Kumar ◽  
Parvesh Puri ◽  
Chetan Sharma ◽  
Kamal Rai Aneja
Keyword(s):  
Schiff Bases ◽  
Thermal Studies ◽  
Zinc Complexes ◽  
Cobalt Nickel ◽  
Copper And Zinc ◽  
Nickel Copper ◽  
Divalent Cobalt

scholarly journals On the Dissolution of Metals in Ionic Liquids 1. Iron, Cobalt, Nickel, Copper, and Zinc

2021 ◽  
Vol 2 (1) ◽  
pp. 63-73
Author(s):  
Jéssica D. S. Vicente ◽  
Domingas C. Miguel ◽  
Afonso M. P. Gonçalves ◽  
Diogo M. Cabrita ◽  
José M. Carretas ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Redox Potential ◽  
Final State ◽  
Iron Cobalt ◽  
Influence Of Temperature ◽  
Dissolution Reaction ◽  
Cobalt Nickel ◽  
Iron Metal ◽  
Copper And Zinc ◽  
Nickel Copper

Ionic liquids are critical reagents for science and technical processes nowadays. Metals are the most used reagents in the industry. It is crucial to have a deeper understanding of how ionic liquids and metals could interact. In this article the interaction of those two families of compounds is accessed. The dissolution (reaction) of metals with ionic liquids is studied, namely the influence of temperature, redox potential, and availability of an oxidant in the process. The final state achieved by the iron metal samples was also addressed by Mössbauer spectroscopy.

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