Abstract
ESR spectra for γ-irradiated at 77 K solutions /0.02–16%/ of tetramethylurea /TMU/ in CFCl3 and Freon-113 have been studied. TMU+. radical cations radiolytically produced in dilute solutions have been shown to undergo intramolecular hydrogen transfer upon photobleaching resulting in CH2N= type radical. Evidence for intermolecular proton transfer in TMU+. radical cations after annealing to phase transition temperature /110–120 K/ in Freon-113 was obtained. Primary radical cations of TMU+. at their ground state take part in ion-molecular reaction via proton transfer. Molecular cations in their excited states may undergo fragmentation producing Me2N radicals, which were trapped in liquid phase by t-BuNO as a spin trap.
Similar content being viewed by others
References
D.N.R. Rao, M.C.R. Symons,Chem. Phys. Lett., 93 /1982/ 495.
M.C.R. Symons,J. Chem. Soc. Chem. Commun., /1986/ 11.
V.N. Belevsky, L.T. Bugaenko, O In Quan,J. Radioanal. Nucl. Chem., Lett. 107 /1986/ 67.
V.N. Belevsky, S.I. Belopushkin, V.I. Feldman,Khimiya Vysokikh Energiy, 21 /1987/ 209.
O In Quan, V.N. Belevsky,Vestn. Mosk. Univ. ser. 2., 28 /1987/ 245.
M.C.R. Symons,J. Chem. Soc. Perkin Trans., 2 /1973/ 797.
A. Wigger, W. Grünbein, A. Henglein, E.J. Land,Z. Naturforsch, 24-b /1969/ 1262.
J.A. Delaire, J.R. Basonin,Can. J. Chem., 57 /1979/ 2013.
M.A. Baldwin et al.J. Chem. Soc. /B/, /1968/ 34.
S. Noda, K. Fueki, Z. Kuri,J. Chem. Phys., 49 /1968/ 3287.
A.G. Davies, R. Sutcliffe,J. Chem. Soc. Perkin II, /1980/ 819.
L.I. Fileleeva, I.P. Samchenko, V.A. Nazarenko, M.M. Aleksankin,Teor. Eksperim. Khimiya, 16 /1980/ 116.
G.V. Kulkarni, A.M. Rao,Proc. Indian Acad. Sci. /Chem. sci./, 93 /1984/ 1377.
V.V. Lobanov M.M. Aleksankin,Teor. Eksperim. Khimiya, 20 /1984/ 472.
Xue-Zhi Qiu, T.S. Peuteost, J.T. Wang, F. Williams,J. Chem. Soc. Chem. Commun., /1987/ 450.
G.A. Olaf,Chem. Rev., 70 /1970/ 561.
I.A. Baranova, V.N. Belevsky, V.I. Feldman,Vestn. Mosk. Univ. ser. 2., 28 /1987/ 137.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Belevsky, V.N., Belopushkin, S.I. Stabilization and reactions of tetramethylurea radical cations in Freon matrices at 77 K: Intramolecular hydrogen transfer, ion-molecular reactions, and fragmentation by electron spin resonance study. Journal of Radioanalytical and Nuclear Chemistry Letters 126, 53–67 (1988). https://doi.org/10.1007/BF02164803
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02164803