Abstract
This study examines the formation of previously unreported crystalline phases of N-methoxyethyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr12O1TFSI). The melting point of pristine Pyr12O1TFSI, determined by conductivity measurements, is between −20 and −17.5 °C. Formation of this crystalline phase is difficult and only occurs under specific conditions. Pyr12O1TFSI readily forms 1:1 phases with both NaTFSI and Mg(TFSI)2. The results of single crystal structure determinations are presented. The Na+ crystalline phase provides clear evidence that the Pyr12O1+ cation can coordinate some metal ions, but this coordinative interaction does not occur with all metal cations, e.g., Mg2+, and in all states of matter, e.g., Na+-IL solutions. The TFSI– ions are found in two different aggregate solvates in the Pyr12O1TFSI:NaTFSI 1:1 phase and in contact ion pair and aggregate solvates in the Pyr12O1TFSI:Mg(TFSI)2 1:1 phase. The Pyr12O1TFSI:Mg(TFSI)2 crystalline phase gives insight into the local struct...
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