Absorption maximum, λ max: 833nm                

Absorptivity in chloroform: 65 L g^-1 cm^-1

Appearance: dark brown powder             

Melting point: 270 – 274°C

Solubility in grams/100 grams of solvent:

              Chloroform 0.49 grams 

MEK 0.38 grams

Xylene 0.12 grams

              Cyclohexanone 0.28 grams