The complex formation of ClO2 with 2,2,6,6-tetramethylpiperidin-1-oxyl (TMP
O) in acetone, acetonitrile, n-heptane, diethyl ether, carbon tetrachloride
, and toluene was studied spectrophotometrically at -20 to +20 degreesC. Th
e thermodynamic parameters of complex formation were determined at 20 degre
esC. The transformation of the complex into the oxoammonium salt TMPO+ClO2-
was found.