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81.
Revealing of water surface pollution with liquid marbles 总被引:1,自引:0,他引:1
Floating of “liquid marbles” on the surface of water contaminated with organic compounds was studied. Marbles were obtained with spreading of hydrophobic polyvinylidene fluoride particles on the surface of water droplets. Marbles floated stably on the water surface, whereas they were destroyed on the water surfaces contaminated with silicon oil and kerosene. Limiting conditions of floating were studied experimentally with the water/alcohol mixtures. 相似文献
82.
Kashapov RR Pashirova TN Kharlamov SV Ziganshina AY Ziltsova EP Lukashenko SS Zakharova LY Habicher WD Latypov SK Konovalov AI 《Physical chemistry chemical physics : PCCP》2011,13(35):15891-15898
Mixed association of calix[4]resorcinarene with ethyl sulfonate groups on the lower rim and dimethylaminomethyl groups on the upper rim (CR) and cationic surfactant 4-aza-1-hexadecyl-azoniabicyclo[2.2.2]octane bromide (DABCO-16) is studied by methods of tensiometry, conductometry, potentiometry and NMR spectroscopy at fixed CR concentration and varied surfactant concentration. Beyond ca. 0.4 mM of DABCO-16, mixed aggregates enriched by CR are proved to be formed due to electrostatic forces, while beyond ca. 5 mM, aggregates enriched by surfactant occur due to the hydrophobic effect. Spectrophotometry monitoring of the solubilization of a hydrophobic dye, Orange OT, demonstrated that only the second type of mixed aggregate enriched by DABCO-16 is capable of binding the organic probe, while the mixed system where the surfactant is a minor component shows no binding capacity towards Orange OT. This finding can be used for the design of nanocontainers with controllable binding/release properties. 相似文献
83.
Sobenina LN Vasil'tsov AM Petrova OV Petrushenko KB Ushakov IA Clavier G Meallet-Renault R Mikhaleva AI Trofimov BA 《Organic letters》2011,13(10):2524-2527
A general efficient route to hitherto inaccessible symmetric and asymmetric meso-CF(3)-BODIPY dyes has been developed. The key stages include the reduction of available 2-trifluoroacetylpyrroles to the corresponding alcohols which are further condensed with pyrroles. The method allows the BODIPY with 3(5)aryl(hetaryl) and 3,5-diaryl(hetaryl) substituents to be readily assembled. The BODIPY dyes synthesized fluoresce (Φ(f) = 0.56-1.00) in the 560-680 nm region. 相似文献
84.
Korshin DE Ziganshina AY Mukhitova RK Kharlamov SV Latypov SK Sokolov MN Fedin VP Konovalov AI 《Organic letters》2011,13(3):506-509
A pH-controlled photoinduced electron transfer in the supramolecular system [(Mo(6)Cl(8))L(6)]-calix[4]resorcine-dimethylviologen is reported. 相似文献
85.
Zhipei Yang Kai Zhang Fangbin Gong Shayu Li Jun Chen Jin Shi Ma Lyubov N. Sobenina Albina I. Mikhaleva Boris A. Trofimov Guoqiang Yang 《Journal of photochemistry and photobiology. A, Chemistry》2011,217(1):29-34
A new pyrazole-based fluorescent sensor, 5-amino-3-(5-phenyl-1H-pyrrol-2-yl)-1H-pyrazole-4-carboxamide (compound 1), was studied for fluoride anion (F?) detection in organic or water-containing solution. This compound displayed both changes in UV–vis absorption and fluorescence emission spectra upon addition of F?. With increasing of F?, blue emission intensity increases drastically and reaches saturation with 607-fold enhancement at 424 nm. The results indicate that compound 1 has highly selectivity for fluoride detection over other anions, such as Cl?, Br?, I?, HSO4?, H2PO4? and AcO? in DMSO or aqueous DMSO solutions. 1H NMR titration and other experiments confirm that the sensing process is mainly from the deprotonation of the pyrazole–NH in compound 1. 相似文献
86.
Boris A. Trofimov Elena Yu. Schmidt Ivan A. Bidusenko Igor’ A. Ushakov Nadezhda I. Protsuk Nadezhda V. Zorina Albina I. Mikhaleva 《Tetrahedron》2012,68(4):1241-1246
Propargylic alcohols, alkylaryl(hetaryl)ethynyl carbinols, under transition-metal-free conditions (KOH/DMSO, 70–80 °C, 10–15 min) unexpectedly undergo stereoselective cyclodimerization to 7-methylene-6,8-dioxabicyclo[3.2.1]octanes having the scaffold of known insect pheromones and marine toxins. Under acetylenic pressure the yields of bicyclic ketals reach 80%. In all the cases, the cyclodimers are formed exclusively as one diastereomer. 相似文献