## 4 Conclusions
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**[MPrIn+]** & **[MPrIn+]** & **[MPrIn+]** & **[MPrIn+]** & **[MPrIn+]** & **[MPrIn+]** & **[MPrIn+]** & **[MPrIn+]** \\
**[I–]** & **[I–]** & **[IF\({}_{6}\)**–]** & **[IF\({}_{6}\)**–]** & **[IF\({}_{6}\)**–]** & **[IF\({}_{6}\)**–]** & **[IF\({}_{6}\)**–]** & **[IF\({}_{6}\)**–]** & **[IF\({}_{6}\)**–]** \\ \hline
227 (vw) & 204 (vw) & & 203 (w) & & 205 (vw) & \(\gamma\)N–CH\({}_{3}\) & [48] \\
227 (vw) & 227 (vw) & 229 (w) & & 227 (w) & & \(\gamma\)N–CH\({}_{3}\)/(\(\gamma\)N) bond, CH\({}_{3}\)(\(\gamma\)N) bond & [20,49] \\
279 (vw) & 272 (vw) & 281 (w) & 274 (m) & 279 (w) & 287 (w) & CH\({}_{3}\)(\(\gamma\)N) and CH\({}_{3}\)(\(\gamma\)N) CN bond & [20,49] \\  & 300 (vw) & & & & CH\({}_{2}\)(\(\gamma\)N), CH\({}_{3}\)(\(\gamma\)N)/CH bond & [4,20,45,47,49,50] \\  & 313 (w) & & & & & [20,45,47] \\
365 (vw) & & 357 (w) & 356 (w) & & & [20,49,50] \\  & 377 (vw) & & 375 (w) & 363 (w) & & CH\({}_{3}\)(\(\gamma\)N) and CH\({}_{2}\)(\(\gamma\)N) CN bond, CCC bend & [20,49] \\  & 400 (vw) & & & & & [45,49] \\
417 (vw) & & 417 (w) & 423 (w) & 419 (w) & & CH\({}_{2}\)(\(\gamma\)N), CH\({}_{3}\)(\(\gamma\)N)/CH bond & [20,49] \\  & & 445 (w) & & & & [20,49] \\  & 481 (vw) & & 478 (w) & 471 (m) & 472 (w) & & [49] \\  & & 527 (vw) & 528 (w) & & & [20,50] \\  & & & & & 568 (w) & FPF spin bond & [45,49] \\
600 (w) & 609 (vw) & 603 (m) & 609 (w) & 600 (m) & CH\({}_{2}\)(\(\gamma\)N), CH\({}_{3}\)(\(\gamma\)N)/CN Str & [44,7,50] \\
619 (m) & & 620 (m) & & 623 (w) & & \(\gamma\)C\({}_{0.01}\)/CH\({}_{3}\)(\(\gamma\)N) CN Str & [19,46,50] \\  & 630 (vw) & & 628 (w) & & & \(\gamma\)(N\({}_{2}\)N)/CH\({}_{3}\)(\(\gamma\)N) CN Str & [19,46,50] \\  & 645 (vw) & & & & & CH\({}_{2}\)(\(\gamma\)N) and CH\({}_{3}\)(\(\gamma\)N) ON Str & [19] \\
659 (vw) & 667 (vw) & 662 (vw) & 666 (w) & 661 (w) & CH\({}_{2}\)(\(\gamma\)N) Str & [19,46,50] \\
696 (vw) & 704 (vw) & 696 (w) & 703 (w) & & & CH\({}_{2}\)(\(\gamma\)N)/CH\({}_{3}\)(\(\gamma\)N) & [19,46,50] \\  & 724 (m) & & 725 (s) & & 724 (m) & ring HCCH sym bend, CH\({}_{3}\)(\(\gamma\)N) Str, CH\({}_{3}\)(\(\gamma\)N) & [19,46,50] \\  & & & & & & [3,19,46,50] \\  & & & & & ring HCCH asym bend/\(\omega\)(CH\({}_{2}\)) rocking & [19,46,50] \\  & 760 (w) & 767 (m) & 769 (s) & & & ring HCCH asym bend/\(\omega\)(CH\({}_{2}\)) rocking & [19,46,50] \\  & & & & 802 (w) & 801 (w) & 802 (vw) & FPF asym str, ring HCCH asym bend & [45,46,49] \\
868 (vw) & & 866 (vw) & 868 (m) & 866 (m) & 867 (w) & 876 (w) & NC(H)N/propyl chain CCC sym str & [19,46,50] \\  & 880 (vw) & & & & & propyl chain CCC sym str & [19,46,50] \\
904 (vw) & 903 (vw) & 906 (w) & 902 (m) & 905 (w) & 901 (vw) & CCC str & [19,46,50] \\  & & & 932 (w) & & & [19,46,50] \\  & 967 (vw) & & & 964 (m) & 966 (vw) & ring HCCH sym bend, CH\({}_{3}\)(\(\gamma\)N) and CH\({}_{3}\)(\(\gamma\)N) CN & [19,46,50] \\  & & & & & & CH\({}_{2}\)(\(\gamma\)N) and CH\({}_{3}\)(\(\gamma\)N) CN str & [19,46,50] \\ \end{tabular}
\end{table} 
Table 10: Observed FT-Raman bands and their tentative assignment of [1–MPrIn+][I–], [I–], [I–]MPrIn+][I–], [I–MPrIn+][BF\({}_{6}\)–], [I–MPrIn+][BF\({}_{6}\)–], and [I–2-DMPrIM+][PF\({}_{6}\)–], [I–], [I–2-DMPrIM+][PF\({}_{6}\)–], [I–], [I–2-DMPrIM+][PF\({}_{6}\)–], [I–], ww = very weak, w = weak, m = medium, s = strong, sh = shoulder, Str = stretch, \(\delta\) = deformation, bend = bending deformation, \(\gamma\) = out of plane deformation, \(\omega\) = wagging, \(\rho\) = rocking, sym = asymmetric, asym = asymmetric.