p-nitroaniline is a yellow needle-like crystal and easy to sublimate
ppda is a white to light purple red crystal, it is the simplest aromatic diamine. its alkalinity is weaker than ammonia, slightly stronger than aniline, and it is easily to be oxidized. the reaction of ppda is mainly involves the reaction of amino groups, and the reaction of benzene rings
chda (cyclohexane-1,4-diamine，cis/trans mixture) is a kind of aliphatic diamine, which is a colorless or yellow solid-liquid mixture at room temperature
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