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Found 4,464 Results / Page 298 of 298
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Solid-state optical properties of a chiral supramolecular fluorophore consisting of chiral (1R,2R)-1,2-diphenylethylenediamine and fluorescent carboxylic acid derivatives
2007 / Tetrahedron LettersBy using (1R,2R)-1,2-diphenylethylenediamine as a chiral molecule and 2-anthracenecarboxylic acid as a fluorescent molecule, we created a chiral supramolecular organic fluorophore having circularly polarized luminescence properties in the solid-state.
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Ultrasound induced formation of organogel from a glutamic dendron
2007 / TetrahedronNew l-glutamic acid based dendritic compounds: N-(2-naphthacarbonyl)-l-glutamic acid diethyl ester (NGE) and N-(2-naphthacarbonyl)-1,5-bis(l-glutamic acid diethyl ester)-l-glutamic diamide (NBGE) were designed. Although NGE could not form any gels in common solvents, NBGE could form stable gels in hexane, toluene, and water under ultrasound. Three dimensional netwo...
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Experimental and calculated circular dichroism spectra of monoaza[5]helicenes
2007 / Inorganica Chimica ActaCircular dichroism (CD) spectra have been measured in the range of 400–200 nm on CH3OH solutions of both enantiomers for the almost complete series of monoaza[5]helicenes, namely the molecules where the hetero N atom occupies positions 1, 3, 4, 5, 6, and 7, respectively (the 2 isomer is missing due to difficulties in the synthesis). CD spectra recorded at con...
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Topical Delivery of Aceclofenac from Lecithin Organogels: Preformulation Study
2006 / Current Drug DeliveryThe purpose of this research is to evaluate the suitability of lecithin organogels containing aceclofenac for topical application. The present article focuses on the preformulation part of the whole research work. Thin layer chromatography was carried out to determine lecithin's purity. The excipients for formulating lecithin organogel were screened. Lecithin o...
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Enantiomeric Resolution and Biotoxicity of Methamidophos
2006 / Journal of Agricultural Food ChemistryDespite the fact that the biological processes of chiral pesticides are enantioselective, the biotoxicity of methamidophos with respect to enantioselectivity has so far received limited research. In this study, the enantiomeric separation and biotoxicity of the two enantiomers of methamidophos were investigated. Successful enantioseparation of methamidophos using h...
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Chiral high-performance liquid chromatographic separation and circular dichroism spectra of the enantiomers of cytotoxic aristocularine alkaloids
2006 / Journal of Chromatography AThe HPLC enantiomeric separation of the racemic cularinoid alkaloids N-p-methoxy-1,α-dihydroaristoyagonine (1) and 4′,5′-demethoxy-1,α-dihydroaristoyagonine (2) was accomplished using five chiral stationary phases (CSPs), some of them polysaccharide-derived ones. The molecular size and conjugative effect strongly affect the different enantio...
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Structure, electronic circular dichroism and Raman optical activity in the gas phase and in solution: a computational and experimental investigation
2005 / Physical Chemistry Chemical PhysicsA computational (ab initio and molecular dynamics) and experimental exploration of the relative importance of molecular conformation and explicit solvent effects on the electronic circular dichroism (ECD) of chiral molecules, is presented. The exploration includes an assessment of the validity of angular correlation (sector) rules linking ECD to molecular conformat...
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2,15-Dihydroxy-hexahelicene (HELIXOL): synthesis and use as an enantioselective fluorescent sensor
2001 / TetrahedronThe helical diol 2,15-dihydroxy-hexahelicene (HELIXOL) is an excellent fluorescence sensor for chiral amines and amino alcohols. The fluorescence of HELIXOL can be efficiently as well as enantioselectively quenched by the enantiomers of several chiral amines and amino alcohols. Its high fluorescence intensity and its ability to enantiodiscriminate effectively makes...
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Ambient-dried silica aerogel doped with TiO2 powder for thermal insulation
2000 / Journal of Materials ScienceTwo step-derived SiO2 sol doped with TiO2 powder dissolved in ethanol was prepared. After aging and washing of wet gel, surface modification with TMCS (trimethylchlorosilane) was followed to prevent additional condensation reaction during drying. Ambient-dried SiO2-TiO2gel was heat-treated at various temperatures. The effects of the heat-treated temperature on the ...
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