Abstract
A new mononuclear cobalt(III) complex, [Co(HL1)2]Cl (1), derived from the reduced Schiff base 2,2'-((ethane-1,2-diylbis(azanediyl))bis(methylene))diphenol (H2L1), and a new dinuclear cobalt(III) complex, [Co2(L2)2]∆2H2O (2), derived from the reduced Schiff base 6,6'-(2-hydroxypropane-1,3-diyl)bis(azanediyl)bis(methylene)bis(2-bromo-4-chlorophenol) (H2L2), were synthesized and characterized by infrared and electronic spectroscopy, and single crystal X-ray diffraction techniques. The ligands were synthesized first, and then bound to the Co(III) centre. Compound 1 contains a mononuclear [Co(HL1)2]+ cation and a chloride anion. The cationic moiety possesses crystallographic inversion center symmetry. Compound 2 contains a dinuclear [Co2(L2)2] molecule and two water hydrate molecules. The Co atoms in the complexes are in octahedral coordination. Both complexes showed potential antimicrobial activity.
Highlights
Schiff bases derived from the condensation reactions of carbonyl containing compounds with primary amines have received tremendous attention in coordination chemistry because of their facile coordination ability to a large number of metals.[1]
The Schiff bases have good complexing ability and their biological activity increases on complex with metal ions.[4]
Multi-dentate Schiff base ligands containing both nitrogen and oxygen donor atoms, derived from the condensation of salicylaldehyde and various diamines have intensely been studied, due to their ability to stabilize a great variety of coordination numbers and coordination geometries.[5]
Summary
Schiff bases derived from the condensation reactions of carbonyl containing compounds with primary amines have received tremendous attention in coordination chemistry because of their facile coordination ability to a large number of metals.[1] Schiff bases have various biological applications.[2] A number of complexes with Schiff base ligands have presented interesting biological properties, such as antibacterial, antifungal, antitumor, and enzymatic catalytic property.[3] The Schiff bases have good complexing ability and their biological activity increases on complex with metal ions.[4] Multi-dentate Schiff base ligands containing both nitrogen and oxygen donor atoms, derived from the condensation of salicylaldehyde and various diamines have intensely been studied, due to their ability to stabilize a great variety of coordination numbers and coordination geometries.[5] Cobalt(III) Schiff base complexes are important in bioinorganic chemistry for important biological processes like antibacterial, antitumor, and antifungal activities.[6] Schiff bases are not very stable in acid condition due to the azomethine groups. Reduced Schiff bases are in general more stable than Schiff bases. Two new cobalt(III) complexes, [Co(HL1)2]Cl (1) and [Co2(L2)2] ∙ 2H2O (2), where HL1 and L2 are the monoanionic form of the reduced
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