Organic salts (functional ionic molecular liquids, FiMLs) in the liquid, liquid crystal, and crystalline states of matter incorporate ionic interactions that can counterbalance phase separation and even lead to molecular organizations that outperform traditional materials. Many FiMLs are ionic liquids at room temperature, display high thermal stability, offer easy synthetic purification routes, and exhibit a range of structural versatility by varying the side groups and counter anion. Despite growing interest in ionic materials properties based on imidazolium compounds, very little is known on systems which display luminescent behavior resulting from the organization in the liquid and crystal neat. One of the objectives of this project is to develop a new, solid material for the detection and identification of slow and fast neutrons. This work will focus on the design, optimization, and synthesis strategy for a series of solid, mesomorphic, and liquid ionic materials containing an imidazolium-fluorophore sub-unit to maximize quantum yield luminescence in the neat by preventing excimer formation via π-π interactions between fluorophore aromatic units. An improvement on traditional Ullman couplings using microwave assisted reactions allows easy gram scale access to <i>N</i>-substituted imidazole-based compounds without the need for solvent nor inert atmosphere. A subsequent nucleophilic substitution reaction with the imidazole compound and an alkyl halide will yield the FiML, whose transition temperature can be tuned through an anion metathesis reaction.

Luminescent ionic materials toward neutron radiation sensors

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.