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146ChemInform Abstract The imines (I) are converted to their sodium salts (II). These are then converted to the title compounds (III) by reaction with (CF3SO2)2O or with CF3SO2Cl. The group attached to the aryl moiety R of the titlecompounds (III), is, by its electronic nature, a very strong electron acceptor, which exerts the same effect on the aryl group as do two nitro groups in the ortho and para positions of the a romatic ring. Diazotization of the amine (IV) followed by treatment with PhNMe2 affords the diazo compound (V), which displays negative halochromism, i.e. the absorption maxima are shifted to greater wavelengths on going from acidic to neutral media.

The antimicrobial activity of nanoparticles (NPs) depends of the surface area in contact with microorganisms. The large surface area of the nanoparticles enhances their interaction with the microbes. In this work, a green, simple, rapid, and efficient ultrasound-assisted reduction method for silver nanoparticles (AgNP) synthesis is presented. For the synthesis, an aqueous solution of silver nitrate, ethanol, and ammonia was used. The adopted method can be easily implemented for any kind of scientific or industrial application due to its cost-effective nature. The effect of sonication time on the nanoparticle formation was investigated. Silver nanoparticles were analyzed through transmission electron microscopy and UV-vis spectroscopy. Antimicrobial additives can be incorporated in mass in different matrixes (polymeric or cellulosic), which is a convenient methodology to achieve antimicrobial activity. In this work, silver nanoparticles were incorporated in cellulose using an ultrasonic bath technique. The most important aspect of cellulose containing silver nanoparticles prepared by this method is its high antimicrobial efficiency. The microbiological study was carried out by a standard agar technique. The analysis showed that cellulose with incorporated silver nanoparticles exhibited strong antimicrobial activity against