9,9'-BIS(FLUORENYLIDENE) AND TETRA-N-HEPTYLAMMONIUM IODIDE FOR THE MEASUREMENT OF OZONE CONCENTRATIONS IN ORGANIC MEDIA

The two title compounds were shown to be useful reagents for determina tion of ozone and peroxides in organic media and at temperatures as lo w as -78 degrees C. 9,9'-Bis(fluorenylidene) is a highly colored hydro carbon whose quantitative disappearance upon reaction with ozone can b e followed spectrophotometrically. Tetra-n-heptylammonium iodide, a no nhygroscopic organic-soluble iodide, reacts quantitatively with ozone and peroxidic materials yielding iodine, which can be measured by the usual methods, Reaction and measurement conditions for both systems we re also studied.