The present study reports an eco-friendly, biosynthesis of silver nanoparticles (AgNPs) using stem bark extract of Diospyros montana. Initially, the synthesis of AgNPs was confirmed by visual observation as color change. Further, the morphology of the biosynthesized nanoparticles, average size and presence of elemental silver were characterized by UV-Visible spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray and dynamic light scattering spectrometer. Qualitative phytochemical screening and FTIR spectral peaks supported the role of phytochemicals in bark extract for the metal reduction, stabilization and capping of silver nanoparticles. XRD studies demonstrated that crystalline nature and their average size of nanoparticles was 28 nm as determined by Scherrer's formula. The antioxidant ability of AgNPs and plant extract was analyzed using DPPH and Hydrogen peroxide assay. The percentage of DPPH and H 2 O 2 activity was increased with increasing concentration of AgNPs. In vitro antibacterial effect of various concentration of AgNPs was investigated against both Gram positive (B.subtilis and S.aureus) and Gram negative (E.coli and K.aerogenes) bacterial strains. The result shows that biosynthesized AgNPs have significant antibacterial activity.

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NitrosationNitrosation O 0265 Chemoselective N-Nitrosation of Secondary Amines under Mild and Heterogeneous Conditions. -A simple, cheap, and chemoselective method for the nitrosation of secondary amines under mild and heterogeneous conditions is reported. Furthermore, the reaction conditions presented are also useful for the nitrosation of chiral amines like proline (III). -(ZOLFIGOL*, M. A.; CHOGHAMARANI, A. G.; TAQIAN-NASAB, A.; KEYPOUR, H.; SALEHZADEH, S.; Bull. Korean Chem. Soc. 24 (2003) 5, 638-640; Dep. Chem., Coll. Sci., Univ. Bu-Ali Sina, Hamadan 65174, Iran; Eng.) -H. Haber 43-053

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Recent studies about innovations in GO/N‐Ligand‐Cu Nano‐Composites have been done. Graphene‐Oxide is improved with N1,N3‐bis (pyridin‐2‐ylmethyl)propane‐1,3‐diamine and after that is matched with copper (Cu). The chemical composition and the structure of the catalyst were analyzed by TGA/DTG, EDX, XRD, FT‐IR, TEM, and SEM. The results demonstrated that GO/N‐Ligand‐Cu was able to catalyze the chromeno[2,3‐b]pyridine compounds to obtain high yields in short reaction time. The results of the present work are hoped to assist the growth of a new class of heterogeneous catalysts as the high‐function candidate for industrial applications.