X-Ray absorption spectroscopy investigation of 1-alkyl-3-methylimidazolium bromide salts

作者：D'Angelo Paola^*; Zitolo Andrea; Migliorati Valentina; Bodo Enrico; Aquilanti Giuliana; Hazemann Jean Louis; Testemale Denis; Mancini Giordano; Caminiti Ruggero

来源：Journal of Chemical Physics, 2011, 135(7): 074505.

DOI：10.1063/1.3625920

• molecular configurations
• negative ions
• organic compounds
• X-ray absorption spectra

X-ray absorption spectroscopy (XAS) has been used to unveil the bromide ion local coordination structure in 1-alkyl-3-methylimidazolium bromide [C(n)mim]Br ionic liquids (ILs) with different alkyl chains. The XAS spectrum of 1-ethyl-3-methylimidazolium bromide has been found to be different from those of the other members of the series, from the butyl to the decyl derivatives, that have all identical XAS spectra. This result indicates that starting from 1-buthyl-3-methylimidazolium bromide the local molecular arrangement around the bromide anion is the same independently from the length of the alkyl chain, and that the imidazolium head groups in the liquid ILs with long alkyl chains assume locally the same orientation as in the [C(4)mim]Br crystal. With this study we show that the XAS technique is an effective direct tool for unveiling the local structural arrangements around selected atoms in ILs.

• 出版日期2011-8-21