X-ray emission and X-ray photoelectron study of the electronic structure of paramagnetic and diamagnetic derivatives of 3-imidazoline

X-ray emission spectra of oxygen OK α and X-ray photoelectron O1s spectra are obtained for stable nitroxyl radicals: 3-imidazoline derivatives and their diamagnetic derivatives. It is shown that the highest occupied molecular orbitals in the nitroxyl radicals mainly consist of oxygen and nitrogen 2p atomic orbitals of the nitroxyl group. Distinctions in the X-ray emission spectra of oxygen of the compounds studied can be due to the presence of the unpaired electron in the radicals.