[mhanze]

Hey guys, I need help in these IR spectrum assignation. Those are my product and quatery ammonium salt, I have to be sure that I have right compounds. So can you help me with assignation of this two spectrums, the one with benzimidazolium salt are three aligned spectrum, but they are the same compound.

[Heisenberg Jr.]

you can try to use this IR table for functional groups:
http://www.wellesley.edu/Chemistry/chem211lab/Orgo_Lab_Manual/Appendix/Instruments/InfraredSpec/Chem211%20IR%20Lit%20Value%20Table.pdf