| | 1 | Author
| Structure, M. Spectroscopy, H.-D Agnetism, WolfgangK. Hausena, Aim, Andreas Schulz3, MichaelM. Oscherosch3, Jeanne Jordanovb, C.E A, -CE N Grenoble | Requires cookie* | | | Title
| Erstmaliger Nachweis von ;r-;r-Dimerenbildung bei stabilen 1,4-Dialkylchinoxalinium-Radikalkationen. Struktur, Spektroskopie und Magnetismus First Evidence for 7t-7r-Dimerization of the Stable 1,4-Dialkylquinoxalinium Radical Cations  | | | | Abstract
| Crystal and molecular structure analysis o f 1,4-diethylquinoxalinium iodide shows a virtual ly planar quinoxaline ring with 11 conjugated 7r-electrons. In contrast to the triiodide o f the I,4,6,7-tetramethyl derivative or to the tetraphenylborate salt o f 1,4-diethylquinoxalinium cat ion radical the iodide exhibits 7r-7r-dimerized radical cations in the solid state with synplanar ethyl groups and a rather small intermolecular distance o f about 315 pm between the 7r-planes o f the primarily interacting 1,4-diazine rings. Solid state magnetic measurements between 2 and 300 K show considerably diminished magnetic m om ents due to partial spin-pairing, and UV/VIS spectroscopic measurements in acetonitrile reflect the 7r-7r-interaction in solution through the appearance o f a long-wavelength absorption band. | | | |
Reference
| Z. Naturforsch. 48b, 1181—1186 (1993); eingegangen am 1. Juni 1993 | | | |
Published
| 1993 | | | |
Keywords
| Heterocycles, Radical Cations, Structure, M agnetism, A ssociation Phenomena | | | |
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