Synthesis and Characterization of Some Novel Dendritic Architectures Bearing Chalcone at the Periphery Through Click Approach

Synthesis of 1,2,3-triazole-based dendritic architectures bearing a chalcone unit at the surface group has been achieved through a click reaction by the convergent synthetic strategy, in which tri- and tetra-azide were used as core units.     

Microwave Assisted One Pot Synthesis of Substituted 3-Formyl Benzoates Using Vilsmeier Reagent

A facile one pot conversion of alkyl diacylacetates to 2,6-dichloro-3-formyl benzoates using Vilsmeier reagent in a two pronged strategy - conventional heating and microwave irradiation method is reported. The reaction time has been brought down from hours to seconds in microwave irradiation method.     

A facile strategy for the one pot multicomponent synthesis of spiro dihydropyridines from amines and activated alkynes

An efficient preparation of a series of spiro dihydropyridines via one pot four-component reactions of mono/di/tri-ketones, malononitrile, primary amines, and acetylenic esters is reported. The reaction is atom-efficient, high yielding, and follows a simple experimental procedure.     

Stabilization of sensing performance for mixed-potential-type zirconia-based hydrocarbon sensor

The recently reported sensing characteristics of the mixed-potential-type yttria-stabilized zirconia (YSZ)-based hydrocarbon (HC) sensor attached with ZnCr₂O₄-sensing electrode (SE) were found to be changed after the 10-day operation at 550 °C under the wet condition (5 vol.% water vapor). To improve the stability of the present sensor, the several modifications of the SE material by adding YSZ powder were examined. As a result, the sensor using the laminated (ZnCr₂O₄/YSZ)-SE gave the stable electromotive force (emf) response against 100 ppm C₃H₆ at 550 °C for about one month examined. Based on the scanning electron microscopy (SEM) observation and the AC complex-impedance measurements, it was concluded that the stable behavior of the sensor using the laminated (ZnCr₂O₄/YSZ)-SE was provided by the stabilization of the interface between ZnCr₂O₄ grains and YSZ particles. The fabricated sensor exhibited the linear dependence of sensitivity on the logarithm of either C₃H₆ concentration (in the range of 20-800 ppm) or mixtures of various hydrocarbons (HCs) (in the range of 90-2600 ppmC). In addition, the emf response was not altered by the change of O₂ (2-20 vol.%), H₂O (0-10.8 vol.%) and CO₂ (0-20 vol.%) concentrations, and no interference of other gases (CO, NO, NO₂, H₂, and CH₄) was observed.     

Synthesis and DSSC application of novel dendrimers with benzothiazole and triazole units

Synthesis of novel dendrimers with benzothiazole as surface group and triazole as branching unit is achieved through click chemistry. The presence of more number of benzothiazole and triazole units increases the molar absorption coefficient and alters the fluorescence as well as electrochemical behaviors in the dendrimers. Dye-sensitized solar cell (DSSC) studies reveal that dendrimers with more number of benzothiazole and triazole groups exhibit better current generating capacity than the dendrimers with lesser number of benzothiazole and triazole groups. Dendrimer 2b shows the maximum current conversion efficiency (η) of 7.1%.     

Spectral Response and Photoelectrochemical Properties of Cd1-xZnxSe Films

Cd1-xZnxSe films with different zinc contents are deposited by an electron beam evaporation technique onto glass substrates for applications in solid-state photovoltalc devices. The structural, optical and photoelectrochemical （PEC） properties of Cd1-xZnxSe films are studied. The host material Cd1-xZnxSe is prepared by the physical vapor deposition method of electron beam evaporation technique （PVD： EBE） under a pressure of 1 × 10^-5 mbar. The x-ray diffractogram indicates that these alloy films are polycrystalline in nature, hexagonal structure with strong preferential orientation of the crystallites along （002） direction. The optical properties shows that the band gap Eg varies from 2.08 to 2.84eV as zinc content varies from 0.2 to 0.8. A PEC cell of the configuration n-Cd1-xZnxSe/Na2S-S-NaOH is fabricated and the dynamic current-voltage characteristics in the dark atmosphere have been examined at room temperature. It has been found that both Voc and Iac decrease with the photoelectrode composition x. Efficiency η and fill factor （FF） also show similar variations. The material properties would be altered and excellently controlled by controlling the system composition x.     

Tamarind seed polysaccharide biopolymer membrane for lithium-ion conducting battery

Solid biopolymers have gained much attention in the development of polymer electrolytes due to its biocompatibility, film-forming nature, and non-toxicity. In the present work, biopolymer membrane has been prepared using tamarind seed polysaccharide (TSP) as host polymer and various concentrations of lithium chloride (LiCl) salt as dopant by solution casting technique. The prepared biopolymer electrolyte has been characterized by XRD, FTIR, differential scanning calorimetry (DSC) analysis, AC impedance spectroscopy analysis, and transference number measurement. XRD analysis has been done to investigate the amorphous/crystalline nature of the polymer membrane. The highest amorphous nature has been found for 1 g of TSP with 0.4 g LiCl. FTIR spectrum analysis confirms the complex formation between TSP biopolymer with LiCl. From AC impedance conductivity analysis, the maximum ionic conductivity is of the order of 6.7?×?10^?3 S cm^?1 at room temperature for 1 g TSP with 0.4 g LiCl, whereas for pure TSP biopolymer membrane, the ionic conductivity is of the order of 5.48?×?10^?7 S cm^?1. The glass transition temperature for the highest conducting biopolymer membrane for the composition of 1 g TSP: 0.4 g LiCl has been found to be 44.25 °C using the DSC technique. Employing the maximum conducting biopolymer membrane, a lithium-ion conducting battery has been fabricated and its discharge characteristics have been studied.     

Preliminary investigation on biological possessions of Saquinavir-modified quinoline-derived azadipeptidomimetics

Herein, azadipeptidomimetic molecules were designed and synthesized using a quinoline-histidine-amino acid sequence with terminal amino acid modification. In-silico studies were carried out to evaluate the compound's HIV protease-1 inhibition temperament. In-vitro anti-proliferative possessions of the test compounds were studied by executing a series of experiments, namely DNA binding, bovine serum albumin (BSA) binding capability, and cytotoxicity assay on MCF-7 cells. The molecule 5j exhibited remarkable results in all experiments; it has an excellent DNA binding constant (3.76 × 10⁵), higher serum albumin unbound concentration of 5.96%, and a significant antiproliferative effect on MCF-7 cells with IC₅₀ value 0.31 nM.     

Crystal and molecular structure of 2,6‐bis(4‐chlorophenyl)‐3‐phenylpiperidin‐4‐one

The crystal structure of the title compound is described. The chemical formula of the compound is C₂₃H₁₉Cl₂NO. The compound is found to crystallize in monoclinic system with space group P2₁/c, Z = 4. The unit cell dimensions are a = 15.137(3) Å, b = 8.9171(18) Å, c = 14.779(3) Å, β = 91.461(4)° and V = 1994.2(7) ų, D_calc = 1.320 gcm^‐3. The final R factor is 4.4%. The central piperidone ring of the molecule adopts a slightly distorted chair conformation, the mean torsion angle being 52.3°; the phenyl rings are planar. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)