103 research outputs found
Synthesis, characterization and dyeing behavior of heterocyclic acid dyes and mordent acid dyes on wool and silk fabrics
No full textNovel heterocyclic acid and mordent acid dyes were synthesized by the coupling of diazonium salt solution of different aromatic amines with 2- butyl-3-(4-hydroxybenzoyl)benzofuran. The resulting heterocyclic acid dyes were characterized by spectral techniques, i.e., elemental analysis, IR, 1HNMR, 13C-NMR spectral studies and UV- visible spectroscopy. The dyeing performance of all the heterocyclic acid dyes was evaluated on wool and silk fabrics. The dyeing of chrome pre treated wool and silk fabrics showed better hues on mordented fabrics. Dyeing of wool and silk fabrics resulted in pinkish blue to red shades with very good depth and levelness. The dyed fabrics showed excellent to very good light, washing, perspiration, sublimation and rubbing fastness
Synthesis, Characterization and Dyeing Behaviour of Heterocyclic Acid and Mordent Dyes on Wool and Silk Fabrics
No full textAbstractIn the field of dye industries, heterocyclic compounds can play the important role to synthesis the various acid and mordent dyes which can give the variety of shades to different fabrics. Here, new heterocyclic acid and mordent acid dyes were synthesized by the coupling of diazonium salt solution of different aromatic amines having acidic groups with derivatives of dihydrobenzofuran and the obtained heterocyclic acid dyes were analyzed by various spectral techniques and the dyeing assessment of all the dyes was evaluated on wool and silk fabrics and the dyeing of chrome pre-treated wool and silk fabrics showed better shades on mordented fabrics due to chrome complex and it shows good shades with excellent depth and level ness and the dyed fabrics showed excellent fastness properties
Impedance spectroscopy and NMR studies of fast ion conducting chalcogenide glasses
No full textTwo fully automated, temperature controlled, impedance spectroscopy workstations have been developed for this project. Impedance spectroscopy studies of glasses have been performed over the wide frequency (1 Hz-1 GHz) and wide temperature (100-500 K) range;This study yields the first-ever full compositional (three decades) range examination of the Na[subscript]2S + B[subscript]2S[subscript]3 and K[subscript]2S + B[subscript]2S[subscript]3 systems. The activation energy is modeled using a modified Anderson-Stuart model that predicts well the results for the low alkali glasses. a.c. conductivity is examined through the electrical modulus formalism and the Kohlrausch-Williams-Watts decay function. The first-ever compositional study of the approach to exponential relaxation with decreasing alkali concentration or ion-ion separation distance is reported. Although single exponential relaxation is approached, the amount of conductivity dispersion is unchanged;The first-ever study of ion dynamics through conductivity and nuclear spin lattice relaxation for three FIC lithium chalcogenide glasses (over the same frequency and temperature range are reported. For all glasses, the NSLR and the conductivity activation energies are approximately the same. The correlation time for conductivity is an order of magnitude less than that for NSLR and the KWW [beta] parameter yields smaller values for NSLR;Closer examination of the electrical modulus spectrum shows that its shape is dependent on the conductivity and the dielectric constant. The reason for the approach to single exponential behavior is due to the decreasing contribution of the hopping ions to the dielectric constant with decreasing concentration;The KWW function is not fit to the electrical modulus on the right side of the peak where the conductivity dispersion occurs and explains why conductivity dispersion is observed even for a [beta] = 0.93 fit;The ion-hopping dielectric relaxation frequency should be used as the characteristic ion-hopping frequency instead of the frequency where the M[superscript]'' peak maximum. Fitting the conductivity data with the KWW function yields [beta] values comparable to those obtained for the NSLR experiment. The similar activation energy, relaxation times and [beta] results support the hypothesis that the ion dynamics in the conductivity and the NSLR experiment are the same.</p
Synthesis of New Mannich Products Bearing Quinoline Nucleous Using Reusable Ionic Liquid and Antitubercular Evaluation
No full textSynthesis, Characterization and Dyeing Assessment of Novel Bisazo-Acid Dyes Derived from 2-hydroxy- 4-Methoxybenzophenone-5-sulphonic acid
No full textAbstract — New bisazo-acid dyes were synthesised by the coupling of diazonium salt solution of different aromatic diamines with from 2-hydroxy-4-Methoxybenzophenone-5-sulphonic acid. The resulting bisazo-acid dyes were characterized by spectral techniques, i.e., elemental analysis, IR, 1 H-NMR and UV – visible spectroscopy. The dyeing performance of all the bisazo-acid dyes was evaluated on wool and silk fabrics. Dyeing of wool and silk fabrics resulted in dark blue to red shades with very good depth and levelness. The dyed fabrics showed excellent to very good light, washing, perspiration, sublimation and rubbing fastness
Synthesis, Characterizations and Microbial Studies of Novel Mannich Products Using Multicomponent Reactions
No full textTrimethylglycine-Betaine-Based-Catalyst-Promoted Novel and Ecocompatible Pseudo-Four-Component Reaction for Regioselective Synthesis of Functionalized 6,8-Dihydro-1′<i>H</i>,5<i>H</i>‑spiro[[1,3]dioxolo[4,5‑<i>g</i>]quinoline-7,5′-pyrimidine]-2′,4′,6′(3′<i>H</i>)‑trione Derivatives
No full textNowadays,
synthesis of novel nitrogen-bearing heterocyclic scaffolds
is a challenging and also demanding task. In our present work, we
demonstrate a novel one-pot pseudo-four-component reaction of 3,4-methylenedioxyaniline, N,N-dimethylbarbituric acid, and aryl/heteroaryl
aldehydes for the regioselective construction of functionalized 6,8-dihydro-1′H,5H-spiro[[1,3]dioxolo[4,5-g]quinoline-7,5′-pyrimidine]-2′,4′,6′(3′H)-trione scaffolds using a trimethylglycine-betaine-based
sustainable catalyst. The title derivatives are achieved through the
formation of three new C–C bonds and one C–N bond, and
two asymmetric carbon centers are generated in the final motif. The
present protocol works efficiently, tolerates different substituents
present in reactants, has a simple operational procedure, provides
excellent reaction yield in a short time, uses a recyclable catalyst,
and results in up to 99.7% purity (HPLC) for the synthesized compounds,
with high diastereoselectivity (d.r. > 50:1 (syn/anti)), excellent
atom economy, reaction mass efficiency, and effective mass yield
Synthesis, characterization and dyeing assessment of novel acid azo dyes and mordent acid azo dyes based on 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid on wool and silk fabrics
No full textAbstractNovel acid mono azo and mordent acid mono azo dyes were synthesized by the coupling of diazonium salt solution of different aromatic amines with 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid. The resulting dyes were characterized by spectral techniques like elemental analysis, IR, 1H-NMR and UV visible spectroscopy. The dyeing performance of all the dyes was evaluated on wool and silk fabrics. The dyeing of chrome pre-treated wool and silk fabrics showed better hues on mordented fabrics. Dyeing of wool and silk fabrics resulted in pinkish blue to red shades with very good depth and levelness. The dyed fabrics showed excellent to very good light, washing, perspiration, sublimation and rubbing fastness
Synthesis, Characterization and Printing Application of Solvent Dyes Based on 2-Hydroxy-4-n-octyloxybenzophenone
No full textSolvent dyes have been prepared by the coupling of diazo solution of different aromatic amines with 2-hydroxy-4-n-octyloxybenzophenone. The resultant dyes were characterized by elemental analysis as well as IR and 1H NMR spectral studies. The UV-Visible spectral data have also been discussed in terms of structure property relationship. The printing of all the dyes on cotton fiber was monitored. The result shows that better hue was obtained on printing on cotton fiber and it is resulted in yellow to reddish brown colorations which showed a good fastness to light, with poor to good fastness to washing, perspiration and sublimation, however it shows poor rubbing fastness
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