Cited by 55
Virginia Commonwealth University
ORCID: 0000-0002-2326-0548Publishes on Crystallization and Solubility Studies, X-ray Diffraction in Crystallography, Multicomponent Synthesis of Heterocycles. 58 papers and 558 citations.
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Room temperature multicomponent reactions (MCRs) are reported using Bi<sub>2</sub>O<sub>3</sub>, BiVO<sub>4</sub>, and Bi<sub>2</sub>WO<sub>6</sub> (nanoparticle) as heterogeneous catalysts. Among these, Bi<sub>2</sub>WO<sub>6</sub> (5 mol%) nanoparticles showed excellent reactivity for the synthesis of functionalized dihydropyridine, polyhydroquinoline, 4<italic>H</italic>-chromene and 2-amino-4<italic>H</italic>-benzo[<italic>b</italic>]pyran derivatives in aqueous medium.
Polyaniline- (PANI) praseodymium Oxide (Pr 2 O 3 ) composites have been synthesized by in situ polymerization method with different weight percentages. The synthesized composites have been characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The temperature dependent conductivity shows that the conductivity is due to the hopping of polarons and bipolarons. These composites show negative thermal coefficient ( α ) behavior as a function of temperature, which is characteristic behavior of semiconducting materials. Sensor studies have been carried out by two-probe method and found that the sensitivity increases with increase in % RH. It is noticed that stability increase is due to the presence of Pr 2 O 3 in polyaniline up to 30 wt%. A fast recovery and response time along with high sensitivity make these composites suitable for humidity sensors.
Various isoxazole–oxindole hybrids were synthesized <italic>via</italic> vinylogous Henry reaction of 3,5-dimethyl-4-nitroisoxazole and isatin under catalyst free conditions in water. The products obtained were functionalized using 1,6-Michael addition reaction.