Volume 58, Issue 3 pp. o222-o223

A monoclinic polymorph of 3-amino-4′-(N,N-diethyl­amino)-5-methyl­bi­phenyl-2,4-dicarbo­nitrile

First published: 29 July 2004
D. Velmurugan, e-mail: [email protected]

Abstract

The title compound, C19H20N4, is found to crystallize in both the orthorhombic and the monoclinic crystal systems. In the monoclinic polymorph, the dihedral angle between the two phenyl rings is 53.5 (2)°. Centrosymmetrically related mol­ecules in the crystal are linked by N—H⋯N hydrogen bonds to form cyclic dimers. The structure of the monoclinic polymorph differs from that of the orthorhombic form reported earlier [Subbiah Pandi et al., (2000). Cryst. Res. Technol. 35, 1373–1381] with regard to the conformation of the bi­phenyl ring system and the molecular packing.

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