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Updated: Apr 16, 2026

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
Published on: August 18, 2012
Three new mononuclear tri-spin lanthanide-nitronyl nitroxide radical compounds: syntheses, structures and magnetic
Lei-Lei Li1, Shuang Liu, Yuan Zhang
1Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, P. R. China. shiwei@nankai.edu.cn.
Abstract:
Based on the nitronyl nitroxide radical, 2-(4-(methoxycarbonyl)phenyl)-4,4,5,5-tetramethylimidazolin-1-oxyl-3-oxide (1, NITPhCOOMe), and three mononuclear tri-spin compounds [Ln(hfac)3(NITPhCOOMe)2] (Ln = Gd (2), Tb (3), Dy (4); hfac = hexafluoroacetylacetonate) are successfully synthesized and fully characterized. Compounds 2 and 4 are isostructural and crystallize in the C2/c space group, while compound 3 crystallizes in the P2₁/c space group. For compounds 2-4, the central metal ions are all eight-coordinate in distorted triangular dodecahedral LnO8 coordination geometry (D(2d) symmetry) completed by three bischelate hfac(-) ligands and two monodentate radicals. Magnetic studies show that radical 1 undertakes the transition from the paramagnetic state to 3D antiferromagnetic ordering at 4.2 K. In addition, compound 3 exhibits field-induced single-molecule magnet (SMM) behavior.
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