4,4'-Diaminobenzophenone

China [CN]

Melting Point: 214~218℃ (pure substance)  Capillary method (GB/T 617)

Boiling Point: 466.7℃ at 760 mmHg  Reduced pressure distillation method

Flash Point: 236.1℃  Cleveland open cup method

Solubility: Slightly soluble in cold water and petroleum ether; soluble in hot water, ethanol, diethyl ether, acetone, and ethyl acetate; readily soluble in dilute acids, DMF, DMSO, and NMP  Visual method + Gravimetric method (25℃)

Density: 1.24±0.1 g/cm³ (25℃)  Pycnometer method

Dissociation Constant (pKa): ~4.8 (aromatic amino group, 25℃ aqueous solution)  Potentiometric titration method

Sublimation: Slightly sublimates at high temperatures (>200℃)  Thermogravimetric analysis (TGA)

Stability: Stable under normal temperature, dry, and sealed storage; avoid high temperature, strong light, strong oxidizing agents, strong acids (concentrated)/strong bases; prolonged exposure to air may cause slight oxidation and yellowing  Accelerated test (40℃/75% RH, 14 days)

Hygroscopicity: Non-hygroscopic (25℃/80% RH, weight gain ≤0.1%)  Dynamic moisture adsorption method