Alejandra Castano1, Robert Engel1, Sharon Lall-Ramnarine2, and James F. Wishart3. (1) Queens College, CUNY, Flushing, NY, (2) Queensborough Community College, CUNY, Bayside, NY, (3) Brookhaven National Laboratory, Upton, NY
The goal of this project is to synthesize cyclic polyammonium compounds that will be able to accommodate an electron as a guest. There have been several reports of cyclic ammonium polycations used as receptors for anionic guests such as chloride. The newly synthesized anion receptors will be used to control the solvation environment for excess electrons generated by pulse radiolysis. Providing a well-defined environment for the electron will help us to understand (by comparison) how the electron is solvated in bulk liquids (ionic and molecular) where the environment is highly disordered. The cyclic cations were synthesized by reacting tertiary diamines such as diazabicyclo[2.2.2]octane (Dabco) and N,N,N',N'-tetramethylbutanediamine with dihaloalkanes to produce the polyammonium cyclic adducts. These polyammonium halide salts were then converted to bis(trifluoromethylsulfonyl)imide salts and were investigated as potential ionic liquids. Preliminary NMR and Mass Spectrometry results indicate that the target cyclic polyammonium compound was not isolated using current reaction conditions. There is evidence that the product isolated is an ionene polymer. Differential Scanning Calorimetry (DSC) and Mass Spectroscopy analysis of this polymer is reported. Future work will focus on synthesizing cyclic polyammonium salts using different reaction conditions and analyzing the products using NMR spectroscopy, elemental analysis, Mass Spectrometry and pulse radiolysis techniques. Supported in part by US DOE contract DE-AC02-98-CH1088 at BNL and the Louis Stokes Alliance for Minority Participation program at CUNY.
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