Purify the azobenzene by column chromatography on alumina, elute with, and crystallise it from, toluene, [Albini et al. J Chem Soc Perkin Trans 2 1393 1982, Flamigni & Monti J Phys Chem 8 9 3702 1985]. The deoxycholate (1:4) complex has m 194-194o (from EtOH). [Beilstein 16 H 341, 16 I 311, 16 III 342, 16 IV 455.]
