Confirmation of syn—anti isomerism of 2,5-dimethoxydicyanoquinonediimine radical anions in solution

Autor:	Albert W. Marsman, Antonio Barbon, Ernst E. van Faassen, Gabriella Romanut, Leonardus W. Jenneskens
Rok vydání:	1997
Předmět:	Crystallography Proton Unpaired electron Chemistry Relaxation (NMR) Molecular symmetry General Physics and Astronomy Activation energy Physical and Theoretical Chemistry Photochemistry Spectroscopy Conformational isomerism Spectral line
Zdroj:	Chemical Physics Letters. 272:250-256
ISSN:	0009-2614
Popis:	The conformational behaviour of 2,5-dimethoxydicyanoquinonediimine radical anions has been studied in polar solvents with ESR and proton ENDOR spectroscopy. Both syn and anti isomers of the radical anions have been identified. The two conformers differ in molecular symmetry and hyperfine coupling between the unpaired electron with nearby protons. Separate spectra of the conformers have been obtained with ENDOR-induced ESR. Finally, from electronic spin relaxation, the activation energy for the interconversion process between the syn and anti conformers was estimated at 28.5 kJ/mol (6.8 kcal/mol).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a985ce809bc45c7fc6a98039e42d8f79 https://doi.org/10.1016/s0009-2614(97)88017-7 Zobrazit plný text záznamu Full Text from ScienceDirect