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Molar-concentration-normalized absorbance spectra in the 700 and 950 cm–1 range for (a) [Cnmim+][Cl–] with n = 6 and 8; (b) [Cnmim+][Br–] with n = 6, 8, 10, (c) [Cnmim+][I–] with n = 3, 4 and 6; (d) [Cnmim+][SCN–] with n = 2 and 4; (e) [Cnmim+][N(CN)2–] with n = 2 and 4, (f) [Cnmim+][TfO–] with n = 2, 4, 6 and 8; (g) [Cnmim+][Tf2N–] with n = 2, 4, 6, 8, and 10; (h) [Cnmim+][BF4–] with n = 2, 4, 6, 8, and 10; (i) [Cnmim+][PF6–] with n = 4, 6, and 8; and (j) [C6mim+][PF3(C2F5)3–].
