Complexes of chlorine dioxide with nitroxyl radicals

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.