✍ Scribed by Sylwia Studzińska; Bogusław Buszewski
No coin nor oath required. For personal study only.
Retention mechanism of ionic compounds is still not fully known and investigated. It concerns especially ionic liquids (ILs) and HPLC. In the present study, interactions between imidazolium ILs and stationary phases were investigated in complex manner. For that purpose, five ILs, eight packing materials (with different functional groups bonded to silica surface) and three different pH of mobile phases were chosen. A great variety of applied chromatographic columns, as well as the changes made in mobile phase, allows for the description of retention mechanism. The main interactions responsible for retention process appear to be electrostatic, π–π and hydrophobic. Such complex results are presented for the first time.
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Scheme 1. Lophyl radical (LC) formation by excitation of o-chlorohexaarylbisimidazole (L-L) with light; and back reaction in the dark to form the dimer.
## Abstract Raman spectra of dilute solutions of acetonitrile in ionic liquids reveal the characteristic features of ionic liquids' polarity. This is accomplished by investigating the Raman bandshape of the ν (CN) band, corresponding to the CN stretching mode of CH~3~CN, which is a very sensitive p
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