A collection of research reports have been documented from the viewpoint green chemistry.

1-Alkyl-3-methylimidazolium cation based ionic liquids efficiently catalyze N-tert-butyloxycarbonylation of amines with excellent chemoselectivity. The catalytic role the liquid is envisaged as “electrophilic activation” di-tert-butyl dicarbonate (Boc2O) through bifurcated hydrogen bond formation C-2 1-alkyl-3-methylimidazolium and has been supported by a downfield shift imidazolium 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][NTf2]) from δ 8.39 to 8.66 in presence...

Hydrogen bond induced reactivity and selectivity control in the 1-butyl-3-methylimidazolium based ionic liquid catalysed reaction of thiols with α,β-unsaturated carbonyl compounds is reported remarkable influence anion C-2 hydrogen catalytic activity reversal selectivity.

Fabrication of uniform thin coatings multi-walled carbon nanotubes (MWCNTs) by electrophoretic deposition (EPD) on semiconductor (silicon) substrates with 3-aminopropyl-triethoxysilane (APTES) surface functionalization has been studied extensively in this report. The gradual and eventual film formation the (CNTs) is greatly assisted Coulombic force attraction existing between positively charged –NH2 groups APTES acid treated, negatively migrating towards surfaces. remarkable characteristics...

Extended π-conjugation through the 2- and 6-positions of BODIPY core induces tunable yellow-red lasing with excellent efficiency up to 41% in toluene.

Abstract We report the observation of replica symmetry breaking (RSB) in a weakly scattering optofluidic random laser (ORL). Coherent lasing is indicated by presence narrow peaks rising out spectral background. This coherence helps to identify threshold, which expected be gradual with weak scattering. find that action initiated using optical pulsed pumping coincides onset both RSB and Lévy flight statistics. However, transition from photonic paramagnetic glass phase more subtle Parisi...

1-Methylimidazole exhibits an unusually high efficiency in promoting the reaction of aryl methyl ketones with DMF-DMA to form (2E)-1-aryl-3-dimethylamino-2-propenones which lacks correlation between catalytic and basicity 1-methylimidazole comparison other amines. An unprecedented supramolecular domino catalysis rationalises lack The assemblies have been characterized by mass-spectrometric ion fishing. time-dependent increase/decrease concentration (ion current) species consolidated mechanism.

We present an experimental study on the effect of photonic stop-band (PSB) random laser (RL) emission characteristics a 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) doped polyvinyl alcohol (PVA) film (DCM-PVA). The film, having its refractive index greater than substrate and density variations at microscopic scale, acts as disordered active planar waveguide. propagation losses for transverse magnetic (TM) electric (TE) modes waveguide are observed to be 0.50 0.74...

This account discusses the use of aqueous zinc(II) tetrafluoroborate as a mild and selective catalyst for various important organic transformations. In general, advantages methodologies discussed include high yields; short reaction times; excellent regio-, chemo­-, stereoselectivities; conditions; efficiency. The in synthesis antihypertensive drug metoprolol is also discussed. 1 Introduction 2 Protection Deprotection 2.1 Selective <i>tert</i>-Butyl(dimethyl)silyl Ethers...

ZnO and Zn2SiO4 nanoparticles embedded SiO2 waveguides, a new candidate for fabrication of low-loss glass-ceramic active-waveguides integrated optic applications, were fabricated by the sol-gel technique using dip-coating process. The waveguides from solution composed (100-x) SiO2–x (x = 25, 30, 35 mol %) exhibited uniform thickness (1.5 ± 0.1 µm), refractive index 1.529 0.005 (for x at 632.8 nm. Propagation loss 1.4 0.2 dB/cm nm was observed in transparent waveguides. as-prepared contained...

We present the statistical analysis of random lasing intensity fluctuations in a 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminos-styryl)-4H-pyran (DCM) doped polyvinyl alcohol (PVA) thin film waveguide subjected to constant heat treatment. The microscopic changes occurring density polymer during various stages solvent evaporation are probed using statistics laser (RL) emission intensities. In rich wet film, stronger RL observed compared dried leading relatively slower decay survival...

We investigate intensity fluctuations of a weakly scattering optofluidic random laser having coherent and incoherent emission fractions. The part comprises spikes, whereas the forms broad pedestal in spectra. Evaluating fractional ratio parts emission, replica symmetry breaking phase transition is observed independently both intensity. Also, component has higher non-zero correlation values compared to those part, implying larger contribution mode coupling. Moreover, survival function...

Angle-dependent emission from a dye infiltrated 2-D on-average periodic structured optofluidic random laser is studied. Distinct signatures of periodicity and randomness are observed in the angle-resolved spectra device. Emission patterns composed concentric ellipses on transverse excitation device, attributed to in-plane diffraction light by square lattice. The effect demonstrated highly resolved angle-dependent spectral scan single fringe. Finally, we conclude that size scatterers resolves...

New and highly emissive 2,6-diacetynyl 2,6-bis-(phenylacetynyl) functionalized pentamethyldifluoroboron-dipyrromethane (BODIPY) derivatives (<bold>FBDP1–2</bold>) with perfluorinated pendant groups at the boron center have been synthesized successfully by combination of two strategies, extending π-conjugation functionalization centre.