α-Nitronyl Nitroxide Cation Radicals

Abstract

X-Ray crystal analysis and magnetic measurements have been carried out on the first cation radical salt of α-nitronyl nitroxide, 2-(4-N-R-pyridinium)-4,4,5,5-tetrametyl-4,5-dihydro-1H-imidazol-1-oxyl 3-N-oxide iodide (with R = methyl (1) and ethyl), suggesting the separation between the spin and the charge density population, and revealing the strong antiferromagnetic intermolecular interaction of JAF/kB = 149 K in 1.

Hybrid Magnetic Materials Based on Nitroxide Free Radicals and Extended Oxalato‐Bridged Bimetallic Networks

“…They were synthesised as iodide salts by a previously described procedure. [22,23] 3 ]. From the study of the magnetic properties of these hybrid materials (vide infra), it became clear that they belong to the 2D type of structure.…”

Solid state NMR strategies for the structural characterization of new hybrid materials based on the intercalation of nitroxide radicals into CdPS3

“…The bright yellow crystals were ball milled for 1 h in a zirconia mortar and sieved. The radical cation iodides 2-(3-N-butylpyridinium)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl-3-N-oxide iodide (m-BuPYNN iodide) and 4-(ethylammonium)-2,2,6,6-tetramethylpiperidin-1-oxyl iodide (EATEP iodide) were prepared according to reported methods [7,8]. Intercalation into CdPS 3 was effected either by direct exposure of the host compound to ethanolic solutions with different radical iodide concentrations (method (a) [5]) or by a two-stage process (method (b)) involving first the preparation of the tetramethylammonium intercalate as an intermediate, followed by ion exchange with the nitroxide cation radical species.…”

Intercalation of stable organic radicals into layered inorganic host matrices: Preparation and structural characterization of Cd1−xPS3(metaMPYNN)2x

“…The nitronyl nitroxide radical ion meta-MPYNN + (Fig. 1) was prepared as the iodide salt according to reported methods [25,26]. Intercalation compound samples were prepared by stirring a methanol solution of meta-MPYNNI for 10 days with ball milled CdPS 3 at room temperature within an evacuated quartz ampoule.…”