Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemartk 9/164AC, 1060 Vienna, Austria.
J Mass Spectrom. 2010 Oct;45(10):1104-10. doi: 10.1002/jms.1782.
A systematic study of five different imidazolium-based room temperature ionic liquids, 1-butyl-3-methylimidazolium acetate, 1-butyl-3-methylimidazolium nitrate, 1-butyl-3-methylimidazolium iodide, 1-butyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide were carried out by means of time-of-flight secondary ion mass spectrometry (ToF-SIMS) in positive and negative ion mode. The compounds were measured under Bi-ion and Bi-cluster ions (Bi(2-7)(+), Bi(3, 5)(2+)) bombardment, and spectral information and general rules for the fragmentation pattern are presented. Evidence for hydrogen bonding, due to high molecular secondary cluster ions, could be found. Hydrogen bonding strength could be estimated by ToF-SIMS via correlation of the anionic yield enhancement with solvent parameters.
通过飞行时间二次离子质谱（ToF-SIMS），对五种不同的咪唑鎓基室温离子液体（1-丁基-3-甲基咪唑乙酸盐、1-丁基-3-甲基咪唑硝酸盐、1-丁基-3-甲基咪唑碘化物、1-丁基-3-甲基咪唑六氟磷酸盐和 1-丁基-3-甲基咪唑双（三氟甲基磺酰基）亚胺）进行了系统研究。在正离子和负离子模式下，采用双原子离子（Bi(2-7)(+)、Bi(3,5)(2+)）和 Bi 团簇离子对化合物进行了测量，并给出了光谱信息和碎片模式的一般规律。由于高分子二级簇离子的存在，可以发现氢键的证据。通过将阴离子产率增强与溶剂参数相关联，可以通过 ToF-SIMS 来估计氢键的强度。
