Magnetic coupling between two phenoxyl radicals attached to the phenyl rings ofCIS- andtrans-stilbenes
| Autor: | Teruyuki Mitsumori, Hiizu Iwamura, Noboru Koga |
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| Rok vydání: | 1994 |
| Předmět: |
Steric effects
Chemistry Stereochemistry Organic Chemistry Zero field splitting Chromophore Inductive coupling law.invention Crystallography law Physics::Atomic and Molecular Clusters Antiferromagnetism Physics::Chemical Physics Physical and Theoretical Chemistry Electron paramagnetic resonance Cis–trans isomerism Magnetic dipole–dipole interaction |
| Zdroj: | Journal of Physical Organic Chemistry. 7:43-49 |
| ISSN: | 1099-1395 0894-3230 |
| DOI: | 10.1002/poc.610070108 |
| Popis: | Magnetic coupling between two sterically protected phenoxyl radicals through the cis- and trans-stilbene chromophores was studied by means of their EPR fine structures. While the zero-field splitting parameters D, which are governed by the magnitude of dipolar coupling, were dependent on the geometrical isomerism, the sign of exchange coupling was independent of it and dictated by the topology of the π-conjugated systems: ferromagnetic in o,m-isomers and antiferromagnetic in m,m'-isomers. |
| Databáze: | OpenAIRE |
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