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Found 4,444 Results / Page 297 of 297
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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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