The values of CMC determined by conductivity measurement, surface tension and UV absorption spectra for the [C_nmpy][Br] in aqueous solution at 298.15 K.

ILs	CMC (mmol L−1)
	Conductivity measurements	Surface tension	Ultraviolet absorption
[C12mpy][Br]	9.74	9.83	10.04
[C14mpy][Br]	2.40	2.26	2.33
[C16mpy][Br]	0.567	0.508	0.520