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In the present work aluminium oxide nanoparticles are synthesized using leaf extract of Ocimum sanctum. The synthesized sample was characterized by XRD, HR-TEM, UV-Vis, FTIR and PL. It is found that aluminium oxide nanoparticles synthesized by leaf extract are stable and show good optical properties. This method of synthesis is less toxic and cost of synthesis is low as compared to other chemical and physical methods. By XRD pattern phase of synthesized aluminium oxide nanoparticles is confirmed and the average particle size is found to be 19.43 nm. By HR-TEM analysis, the particle size of synthesized nanoparticles ranges from 18 nm to 25 nm. By UV-visible spectroscopy the energy band gap is found to be 2.55 eV. By FTIR analysis presence of Al-O band and biofunctional group is confirmed. Photoluminescence spectroscopy confirmed the energy band gap of as synthesized alumina nanoparticles is 2.19 eV. Hence, from the present study, it is concluded that aluminium oxide nanoparticles synthesized by plant leaf extract are good semiconductors.

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Schiff base ligand (E)-5-methyl-3-(1-(4-nitrophenylimino)ethyl)-1H-indol-2-amine was synthesized by the condensation of 1-(2-amino-5-methyl-1H-indol-3-yl)ethanone and 4-nitrobenzenamine in methanol at 70 oC. The prepared Schiff base ligand doped with Cr(III), Mn(III) and Fe(III) ion, respectively and it is denoted as [M(C34H32N8O4)X]X2. The complexes have been characterized with the help of elemental analysis, conductance measurements, magnetic measurements and their structural configuration have been determined by various spectroscopic (electronic, IR, 1H NMR, 13C NMR, GCMS) techniques. Electronic and magnetic moments of the complexes indicate that the geometry of the metal center was five coordinate square pyramidal. These metal complexes were also tested for their antimicrobial activities to assess their inhibiting potential against Staphylococcus aureus, Bacillus subtilis (positive bacteria) and Pseudomonas aeruginosa, Escherichia coli, Salmonella typhi (negative bacteria) and fungi Rizoctonia sp., Aspergillus sp., Penicillium sp. [Cr(C34H32N8O4)OAc](OAc)2 shows best antimicrobial activity against all the pathogens.

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