Synthesis and characterization of divalent manganese, cobalt, nickel, copper and zinc complexes with nicotinic acid

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.

Download Full-text

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

Arabian Journal of Chemistry ◽

10.1016/j.arabjc.2012.12.038 ◽

2017 ◽

Vol 10 ◽

pp. S978-S987 ◽

Cited By ~ 15

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

Download Full-text

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

International Journal of Inorganic Chemistry ◽

10.1155/2012/873232 ◽

2012 ◽

Vol 2012 ◽

pp. 1-9 ◽

Cited By ~ 4

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).

Download Full-text