Chlorine dioxide forms red-colored (lambda(max)=480 nm) CT complexes with p
ersistent piperidine and imidazoline nitroxyl radicals in diethyl ether, n-
pentane, carbon tetrachloride, methylene chloride and on silica gel surface
. Equilibrium constants, enthalpy and entropy of formation and extinction c
oefficient of the complex between ClO2 and 2,2,6,6-tetramethyl-4-oxypiperid
in-1-oxyl 1 in diethyl ether were determined. In Et2O the complex is stable
under normal conditions. in other media it transforms into the oxoammonium
salt. (C) 1999 Elsevier Science Ltd. All rights reserved.