TY - GEN A1 - Holzweber, Markus T1 - Donor-Acceptor Interaction Scale for Ionic Liquids based on ToF-SIMS experiments T2 - AOFA 17 N2 - Room temperature ionic liquids (RTIL) are composed of ions only and are defined as molten salts with a melting point below 100°C1. They have numerous interesting physical properties such as high thermal stability, a wide liquid range and a tuneable viscosity. Besides their low melting points they have also a very low vapour pressure, which enables their analysis in ultra high vacuum devices such as XPS2, 3 and ToF-SIMS2, 4. A systematic study with different ionic liquids was carried out by means of time-of-fight secondary-ion-mass-spectrometry in positive and negative ion mode. Thereby a variation of the anion in 1-butyl-3-methylimidazolium based ionic liquids, a variation of the cation including a variation of the side chain length, in bis(triuoromethylsulfonyl)imide based ionic liquids was taken into account. The compounds were measured under bismuth cluster ion (Bi7+) bombardment, and spectral information and general rules for the fragmentation pattern are presented. Evidence for cation-anion interactions (e.g. hydrogen bonding), due to high molecular secondary cluster ions, could be found. The interaction strength could be estimated by ToF-SIMS via correlation of the secondary anion intensity to secondary cluster ion intensity ratio with donor and acceptor numbers. T2 - AOFA 17 CY - Soest, Germany DA - 2012-09-23 PY - 2012 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/27657 AN - OPUS4-27657 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany