Dicationic bis-imidazoliums as a platform for ionic liquids: Long tails and short spacers

• DOI: 10.1016/j.jil.2022.100045
• Publication Date: 2022-08-17T10:19:51Z
• Authors: Anton A. Zabolotniy; Eugene N. Trush; Olga M. Zarechnaya; Vasilii A. Mikhailov
• Keywords: Dication; Thermochemistry; Thermal Stability

A broad set of bis-imidazolium salts with long tails and short spacers (LTSS BIS) odd even number carbons was synthesized characterized a experimental computational methods, such as 1H 13C NMR (2D techniques included), optical electron microscopy, water content determinations, solubility in assessments, melting points measurements, geometry thermochemistry evaluation for model dications PM6. Theoretically substantiated improvements alkylimidazoles dihalides synthesis have been proposed experimentally verified. Good yields LTSS BIS pure enough physicochemical studies can be achieved fast efficient manner, factors essential getting good results unveiled. The majority are prone to absorb retain it under usual conditions, but easily lose at heating. Large variety crystal forms thermal behavior subfamilies were found, depending mainly from spacer anion. High stability (more than 200°C) is typical all study, only small part may considered true ionic liquid. Fully stretched conformations supposed alkyl fragments (tails spacers) solution, accordance results. Rotation around ordinary bonds restricted 1,3-di(imidazolium-1-yl)-2-hydroxypropane dication, leading unique four sorts protons three sp3-carbon chain. Due specific structural features, cannot represented rod-like molecules. concept principal motifs (U-shape, V-shape, Z-shape) proposed.