Photometric determination of quaternary ammonium compounds with hexanitrodiphenylamine. I.

Dissociation contants, partition coefficients and absorption spectra have been determined for hexanitrodiphenylamine and pentanitrodiphenylamine. The two compounds have quite different dissociation constants and can be easily separated. Both substances give compounds with quater- nary ammonium ions which can be extracted with chloroform or methylene chloride from an aqueous solution. to obtain a pure hexanitrodiphenylamine compound the reagent must be free from pentadinitrodiphenylamine and the extraction made at high pH.