The solid complexes of Mn II , Fe III , Co II , Ni II and Cu II with 3-(3-furan-2yl-acryloyl)-6-methyl-pyran-2,4-dione(L 1 ) and 3-(3-thiophene-2yl-acryloyl)-6-methyl-pyran-2,4-dione (L 2 ) have been synthesized and characterized by elemental analysis, conductometry, thermal analysis, magnetic, i.r., P-n.m.r., u.v.-vis, X-ray diffraction and antimicrobial study. From the analytical and spectral data, the stoichiometry of the complexes has been found to be 1:2 (metal:ligand). I.r. spectral data suggest that the ligand behaves as a dibasic bidentate ligand with O:O donor sequence towards metal ions. The physico-chemical data suggests distorted octahedral geometry for Cu II complexes and octahedral geometry for all other complexes. The X-ray diffraction suggests an Orthorhombic crystal system for the Cu II complex and Monoclinic crystal system for Co II and Ni II complexes of ligand L 1 . The ligands and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli, and the fungicidal activity against Aspergillus flavus, Curvularia lunata and Penicillium notatum.
Yttrium-doped ZnO nanoparticles were synthesized by co-precipitation method to investigate structural, optical and antibacterial properties. X-ray diffraction analysis confirms hexagonal (wurtzite) structure with average crystallite size between 16 and 30 nm. Optical energy band gap decreaseswith increasing Y-doping concentration. ZnO nanoparticles were found to be highly effective against S. aureus and Y-doped ZnO nanoparticles against E. coli, B. subtilis and S. typhi. Undoped and Y-doped ZnO nanoparticles are good inorganic antimicrobial agents and can be synthesized by cost effective co-precipitation method. Keywords: nanoparticles, ZnO, coprecipitation, antibacterial properties.
Resumo
Nanopartículas de ZnO dopado com ítrio foram sintetizadas pelo método de coprecipitação para investigar as propriedades estruturais, ópticas e antibacterianas. A análise de difração de raios X confirma a estrutura hexagonal (wurtzita) com tamanho
A series of new 2-substituted aryl-1H-indole derivatives have been synthesized by reacting phenyl hydrazine with various substituted acetophenones in presence of sulfuric acid in good to excellent yield. This transformation is based on Fischer indole reaction.
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