Properties: Crystals from water, mp 119-120°. bp ~225° (dec). Sol in 10 parts water, 10 parts abs alc; very slightly sol in ether. Two isomorphous crystalline modifications: a-form, "stable form", obtained by sublimation and by crystallization from nonpolar solvents; b-form, "unstable form", obtained by quenching the melt or by crystallization from polar solvents, see Katayama, Acta Crystallogr.
9, 986 (1956);
10, 468 (1957); B. Kalyanaraman et al., J. Cryst. Mol. Struct.
8, 175 (1978).
Melting point: mp 119-120°
Boiling point: bp ~225° (dec)
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