SiO-supported HClO catalyzed synthesis of (Z)-thiazolylhydrazonoindolin-2-ones and their electrochemical properties.

In this paper, an environmentally benign silica-supported perchloric acid (HClO-SiO) catalyzed green FCDR strategy has been developed for the synthesis of (Z)-THIs (6) with high stereospecificity via an intramolecular hydrogen bond (IHB) directed approach, involving the reaction of methyl ketones (1), N-bromosuccinimide (NBS) (2), isatins (4) and thiosemicarbazide (5) in ethanol at reflux temperature for 45-60 min in one-pot. The reaction proceeds through the construction of C-Br (α-bromination), C-S & C-N (heterocyclization), and CN (condensation) bonds in one pot. The absolute structure of the compound (Z)-3-(2-(4-(4-bromophenyl)thiazol-2-yl)hydrazono)indolin-2-one (6e) has been confirmed by single-crystal XRD analysis.

Optimization of N doping in TiO nanotubes for the enhanced solar light mediated photocatalytic H production and dye degradation.

Herein, we report the optimization of nitrogen (N) doping in TiO nanotubes to achieve the enhanced photocatalytic efficiencies in degradation of dye and H gas evolution under solar light exposure. TiO nanotubes have been produced via hydrothermal process and N doping has been tuned by varying the concentration of urea, being the source for N, by solid-state dispersion process. The structural analysis using XRD showed the characteristic occupancy of N into the structure of TiO and the XPS studies showed the existence of Ti-N-Ti network in the N-doped TiO nanotubes.