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Maria Ekimova, Dirk Fröhlich, Dr. Sebastian Stalke, Prof. Dr. Thomas Lenzer and Dr. Kawon Oum Probing the Local Polarity of Alkylammonium Formate Ionic Liquids and Their Mixtures with Water by Using a Carbonyl Carotenoid ChemPhysChem 13

Version of Record online: 16 FEB 2012 | DOI: 10.1002/cphc.201100915

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Poles apart! Ultrafast transient absorption signals from 12′-apo-β-carotenoic-12′-acid were employed to determine the local polarity (see picture; ICT=intramolecular charge transfer) of three alkylammonium formate protic ionic liquids [RNH3]+[HCOO] [R=CH3 (MAF), C2H5 (EAF), and n-C4H9 (BAF)].

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