Conformational Analysis of Quaternary Ammonium-Type Ionic Liquid Cation, N,N-Diethyl-N-methyl-N-(2-methoxyethyl) Ammonium Cation

Figure 2

Potential energy surface of the side chain of [DEME]⁺ as a function of (a) CN⁺CC, (b) N⁺COO⁻, and (c) CCO⁻C dihedral angles. Here, two CCN⁺C angles for the ethyl-group of [DEME]⁺ are fixed at 180°, whose angle corresponds to 𝑡𝑟𝑎𝑛𝑠 form.

(a)

(b)

(c)