Preparation of novel binuclear manganese(III) complexes with schiff base ligands and their reactivities toward hydrogen peroxide

Matsushita, Takayuki; Nakamura, Toshio; Usugi, Shino; Niwa, Kenshin; Fujiwara, Manabu

doi:10.1016/s0162-0134(97)80073-6

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“…Manganese(II) complexes with Schiff base ligands are becoming increasingly important as biochemical, analytical and antimicrobial reagents, in the design of molecular ferromagnets, in materials chemistry and so on. [8][9][10] The biological importance of Schiff base complexes of Mn(II) has been referred by number of studies. [11][12][13] Green chemistry is the effort of reducing or eliminating the use or generation of hazardous substances during chemical procedures 14,15 to keep environment pollution free.…”

Section: Introductionmentioning

confidence: 99%

Microwave Assisted Synthesis, characterization and biological studies of isonicotinoylhydrazones and their Manganese (II) complexes

Punjabi¹,

Gurjar²,

Ameta³

et al. 2018

ECB

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The Schiff base ligands 1-(2-furanyl) ethanone isonicotinoylhydrazone (L 5 H), 1-(2-thienyl)ethanone isonicotinoylhydrazone (L 6 H), 1-(2-pyridyl)ethanone isonicotinoylhydrazone (L 7 H), 1-(2-naphthyl)ethanone isonicotinoylhydrazone (L 8 H), were prepared by the condensation reaction of isonicotinic acid hydrazide with corresponding ethanons in 1:1 molar ratio, respectively, in ethanol under microwave exposure. The Mn (II) complexes have been prepared by mixing MnCl2.4H2O in 1:1 and 1:2 molar ratios with monofunctional bidentate ligands. The structure of the ligands and their transition metal complexes were confirmed by the elemental analysis, molecular weight determinations, IR, electronic and EPR spectral studies. On the basis of these studies it is clear that the ligands coordinated to the metal atom in a monobasic bidentate mode, by O ∩ N donor system. Thus a tetrahedral environment around the Mn(II) ion has been proposed. The antimicrobial activity of Schiff base ligands and their respective Mn(II) complexes were tested against some of pathogenic bacterial and fungal strains. The results indicated that the complexes showed higher activity than the parent ligands. *Corresponding Authors

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Section: Introductionmentioning

confidence: 99%