Crystal and mol. structure anal. of 1,4-diethylquinoxalinium iodide (I) shows a virtually planar quinoxaline ring with 11 conjugated p-electrons. In contrast to the triiodide of the 1,4,6,7-tetra-Me deriv. and to the tetraphenylborate salt of 1,4-diethylquinoxalinium cation radical, I exhibits p-p-dimerized radical cations in the solid state with synplanar Et groups and a rather small intermol. distance of about 315 pm between the p planes of the primarily interacting 1,4-diazine rings. Solid state magnetic measurements between 2 and 300 K show considerably diminished magnetic moments due to partial spin-pairing, and UV/VIS spectroscopic measurements in acetonitrile reflect the p-p interaction in soln. through the appearance of a long-wavelength absorption band. on SciFinder(R)
%0 Journal Article
%1 Hausen.1993
%A Hausen, H. D.
%A Kaim, Wolfgang
%A Schulz, Andreas
%A Moscherosch, Michael
%A Jordanov, Jeanne.
%D 1993
%J Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences
%K cation crystal diethyldihydro diethyldihydroquinoxaline electronic moment radical radical;magnetic radical;mol radical;quinoxaline ray;spectra structure x
%N 9
%P 1181--1186
%R 10.1515/znb-1993-0905
%T First evidence for p-p dimerization of stable 1,4-dialkylquinoxalinium radical cations. Structure, spectroscopy, and magnetism
%V 48
%X Crystal and mol. structure anal. of 1,4-diethylquinoxalinium iodide (I) shows a virtually planar quinoxaline ring with 11 conjugated p-electrons. In contrast to the triiodide of the 1,4,6,7-tetra-Me deriv. and to the tetraphenylborate salt of 1,4-diethylquinoxalinium cation radical, I exhibits p-p-dimerized radical cations in the solid state with synplanar Et groups and a rather small intermol. distance of about 315 pm between the p planes of the primarily interacting 1,4-diazine rings. Solid state magnetic measurements between 2 and 300 K show considerably diminished magnetic moments due to partial spin-pairing, and UV/VIS spectroscopic measurements in acetonitrile reflect the p-p interaction in soln. through the appearance of a long-wavelength absorption band. on SciFinder(R)
@article{Hausen.1993,
abstract = {Crystal and mol. structure anal. of 1,4-diethylquinoxalinium iodide (I) shows a virtually planar quinoxaline ring with 11 conjugated \textgreek{p}-electrons. In contrast to the triiodide of the 1,4,6,7-tetra-Me deriv. and to the tetraphenylborate salt of 1,4-diethylquinoxalinium cation radical, I exhibits \textgreek{p}-\textgreek{p}-dimerized radical cations in the solid state with synplanar Et groups and a rather small intermol. distance of about 315 pm between the \textgreek{p} planes of the primarily interacting 1,4-diazine rings. Solid state magnetic measurements between 2 and 300 K show considerably diminished magnetic moments due to partial spin-pairing, and UV/VIS spectroscopic measurements in acetonitrile reflect the \textgreek{p}-\textgreek{p} interaction in soln. through the appearance of a long-wavelength absorption band. [on SciFinder(R)]},
added-at = {2019-07-15T13:41:23.000+0200},
author = {Hausen, H. D. and Kaim, Wolfgang and Schulz, Andreas and Moscherosch, Michael and Jordanov, Jeanne.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/266d63edb5edf9986875d0cfa078ee7ea/b_schwederski},
doi = {10.1515/znb-1993-0905},
interhash = {200d659d7c2c651c2b049712b0b7803f},
intrahash = {66d63edb5edf9986875d0cfa078ee7ea},
issn = {0932-0776},
journal = {Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences},
keywords = {cation crystal diethyldihydro diethyldihydroquinoxaline electronic moment radical radical;magnetic radical;mol radical;quinoxaline ray;spectra structure x},
number = 9,
pages = {1181--1186},
timestamp = {2019-07-15T11:42:10.000+0200},
title = {First evidence for \textgreek{p}-\textgreek{p} dimerization of stable 1,4-dialkylquinoxalinium radical cations. Structure, spectroscopy, and magnetism},
volume = 48,
year = 1993
}