Semi-empirical APUHF and ab initio UNO CASSCF/4-31G calculations have been carded out for the dimer of m-N-methylpyridinium nitronyl nitroxide cation (m-MPYNN + ) extracted from its experimental crystal structure in order to elucidate the origin of the large ferromagnetic effective exchange integral
Ferromagnetic intermolecular interaction and crystal structure of the p-pyridyl nitronyl nitroxide radical
✍ Scribed by Kunio Awaga; Tamotsu Inabe; Yusei Maruyama
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 189 KB
- Volume
- 190
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
X-ray crystal analysis and magnetic measurements reveal the ferromagnetic linear chain with JF/kB=0.27 K in an a-nitronyl nitroxide, 2-(4-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1 -oxyl 3-N-oxide.
📜 SIMILAR VOLUMES
Transition to a ferromagnetic long-range ordered state was found at 0.60 Kin the orthorhombic Pphase crystal ofg-nitrophenyl nitronyl nitroxide (or 2-(4'-nitrophenyl)-4,4,5,5-tetramethyl-4,5dihydro-lH-imidazol-l-oxyl-3-N-oxide in the IUPAC nomenclature). This finding follows our recent discovery of
## Abstract The crystal structures and magnetic properties of the nitronyl nitroxide radicals 4,5‐dihydro‐4,4,5,5‐tetramethyl‐3‐oxido(1__H__‐imidazol‐1‐yloxyl) (**1**), 4,5‐dihydro‐2,4,4,5,5‐pentamethyl‐3‐oxido(1__H__‐imidazol‐1‐yloxyl) (**2**), 2‐(4‐chlorophenyl)‐4,5‐dihydro‐4,4,5,5‐tetramethyl‐3‐
An a-nitronyl nitroxide cation radical, 2-( 3-N-methylpyridinium)-4,4,5,5-tetramethyl-4,5-dihydro-lH-imidazol-l-oxyl 3-Noxide, has been found to possess a unique structure and magnetic properties: the molecules are manifested as dimers with a very short intermolecular contact between the NO group an
The crystal structure of a new phase of the pnitrophenyl nitronyl &oxide radical compound is described. A study of its magnetic properties reveals the largest intermolecular ferromagnetic coupling reported so far among a series of polymorphs of this compound.