Abstract
We investigate a typical trihalide ionic liquid, 1-octyl-3-methylimidazolium tribromide, using X‑ray photoelectron spectroscopy. The electronic environment of the anion is analyzed in detail. The Br 3d binding energies of the two components are both higher than that measured for 1-octyl-3-methylimidazolium bromide, due to the delocalization of the negative charge spreading over three atoms within the anion. The basicity of [Br3]– is estimated based upon N 1s binding energy. It is found similar to that of [BF4]–.
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