Halle, Jean C. published the artcilePreparation of buffer mixtures in DMSO-water mixtures. Application to the study of nitrodiphenylamines, Safety of Bis(4-nitrophenyl)amine, the publication is Bulletin de la Societe Chimique de France (1970), 2047-53, database is CAplus.
From a study of different buffer solutions in H2O-dimethyl sulfoxide (DMSO) mixtures a selection of 14 acids was made corresponding to regularly spaced acidities and covering a large part of the usual acid-base range. These acids belong to 3 different families: carboxylic acids, phenols, and indoles. By using these buffer solutions in H2O-DMSO mixtures, the ionization of several nitrodiphenylamines was established spectrophotometrically. The relative acidity of these indicators varies largely with the composition of the solvent mixture In addition, DMSO enhances strongly the acidity of some derivatives such as 2,4,6-trinitrodiphenylamine.
Bulletin de la Societe Chimique de France published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Safety of Bis(4-nitrophenyl)amine.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia