Search results for "Chloroform"
showing 10 items of 414 documents
Ion Pair Recognition of Quaternary Ammonium and Iminium Salts by Uranyl-Salophen Compounds in Solution and in the Solid State
2007
Efficient ditopic receptors for quaternary ammonium and iminium salts have been obtained upon functionalization of the uranyl-salophen unit with conformationally flexible side arms bearing phenyl or beta-naphthyl substituents. Binding affinities in chloroform solution have been measured for a large number of quaternary salts comprising tetramethylammonium (TMA), tetrabutylammonium (TBA), acetylcholine (ACh), N-methylpyridinium (NMP), and N-methylisoquinolinium (NmiQ) cations. Recognition of the anion partner is ensured by coordination to the hard Lewis acidic uranyl center, whereas cation-pi/CH-pi interactions of the quaternary ions are established with the aromatic pendants. The role of th…
Impact of lipid extraction on the dearomatisation of an Eisenia foetida protein powder
2010
www.elsevier.com/locate/foodchem ; FSTA:2010-Sp0197; International audience; Delipidation was studied as a way to dearomatise a non-conventional protein powder obtained from Eisenia foetida earthworms. In the first step, we studied the impact of several factors such as solvent type, extraction method and particle size on the yield of extracted lipids. Lipid extraction from samples was considerably improved using an ultrasound method with a chloroform/methanol mixture and small particle size. In the second step, the volatile compounds were extracted from the delipidated protein powder by the SAFE extraction method and by the HS-SPME method, and were further analysed by GC-MS. The chloroform/…
CCDC 1417554: Experimental Crystal Structure Determination
2015
Related Article: Tania Romero-Morcillo, Francisco Javier Valverde-Muñoz, Lucía Piñeiro-López, M. Carmen Muñoz, Tomás Romero, Pedro Molina, José A. Real|2015|Dalton Trans.|44|18911|doi:10.1039/C5DT03084F
CCDC 157255: Experimental Crystal Structure Determination
2002
Related Article: G.Barone, T.Chaplin, T.G.Hibbert, A.T.Kana, M.F.Mahon, K.C.Molloy, I.D.Worsley, I.P.Parkin, L.S.Price|2002|J.Chem.Soc.,Dalton Trans.||1085|doi:10.1039/b108509n
CCDC 1848844: Experimental Crystal Structure Determination
2018
Related Article: Donatella Armentano, Adrián Sanchis-Perucho, Carlos Rojas-Dotti, José Martínez-Lillo|2018|CrystEngComm|20|4575|doi:10.1039/C8CE00996A
CCDC 1481782: Experimental Crystal Structure Determination
2018
Related Article: Negar Rad-Yousefnia, Behrouz Shaabani, Mansoureh Zahedi, Maciej Kubicki, Muhittin Aygün, Francesc Lloret, Miguel Julve, Anita M. Grześkiewicz, Mohammad Sadegh Zakerhamidi, Canan Kazak|2018|New J.Chem.|42|15860|doi:10.1039/C8NJ02605J
CCDC 1478713: Experimental Crystal Structure Determination
2016
Related Article: Toni Mäkelä, Anniina Kiesilä, Elina Kalenius and Kari Rissanen|2016|Chem.-Eur.J.|22|14264|doi:10.1002/chem.201602362
Rod-Length Dependent Aggregation in a Series of Oligo(p-benzamide)-Block-Poly(ethylene glycol) Rod-Coil Copolymers
2005
The synthesis of a series of rod-coil diblock copolymers with flexible poly(ethylene oxide) chains (M n = 5 000 g mol -1 ) and rod blocks consisting of monodisperse oligo(p-benzamide)s is described. The formation of defined supramolecular aggregates in solution as well as the solid state has been analyzed. The length of the oligo(p-benzamide)s has been systematically varied from n = 1 to 7 units. The influence of n on aggregation in chloroform and aqueous solution was investigated by GPC as well as UV-vis spectroscopy. A critical aggregation length was found for chloroform (n = 5) and water (n = 4), below which no aggregation is observed under otherwise identical experimental conditions. Ag…
Further insight into the photostability of the pyrene fluorophore in halogenated solvents.
2012
Pyrene fluorophores of pyrene-functionalized CdSe quantum dots (QD@Py), as well as alkylpyrene and pyrene itself (Py), undergo fast degradation in aerated chloroform under ultraviolet-A (UV-A, 316<λ<400 nm) illumination. Steady-state fluorescence studies of irradiated chloroform solutions of QD@Py show formation of new bands, red-shifted compared to that of the pyrene moiety. Similar behaviour is observed for pyrene and the alkylpyrene system. Column chromatography of the pyrene photolysate in chloroform allowed us to isolate photoproducts arising from pyrene degradation, and to obtain information on the structure of the photoproducts responsible for the emission bands. The most predominant…
Predominance of 2-arylhydrazones of 1,3-diphenylpropane-1,2,3-trione over its proton-transfer products
2001
2-Phenylhydrazones of 1,3-diphenyl-1,2,3-trione are the dominant tautomeric form detected in chloroform solution by 15N NMR chemical shifts. The substituent in the phenylhydrazone moiety does not affect this tautomeric preference. The substituent effect is transmitted effectively only to the hydrazone nitrogen and hydrogen atoms. Ab initio calculations show that the ketohydrazone tautomer is really very much favoured over its proton-transfer products in chloroform solution. The same tautomer was also detected in the crystal state by X-ray crystallography. Copyright © 2001 John Wiley & Sons, Ltd.