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The crystal structure of C.I. Solvent Brown 1, C 16 H 14 N 4 , has been determined by single crystal X-ray diffraction techniques. It crystallises in the orthorhombic system with  a  = 12.771(1) Å,  b  = 13.021(1) Å,  c  = 16.244(3) Å, space group  Pcab , (No. 61),  Z  = 8. The structure has been solved by direct methods and least-squares refinement has been completed on three dimensional data (2561 reflections, MoK α , radiation). The hydrogen atoms have been found but only their positional parameters refined. Final residual 0.096 (all intensity data). The molecule exists as an azo-compound in the  trans  configuration. The molecules are packed in columns parallel to the  a  axis, but, unusually, the molecular plane is almost parallel to the column axis. The molecules are linked by one hydrogen bond per molecule almost parallel to the  b  axis.

Crystal and molecular structure of C.I. Solvent Brown 1, 1,3-diamino phenyl azo-2-naphthalene