6-Chloro-N4,N4-dimethylpyrimidine-2,4-diamine

Abstract

The asymmetric unit of the title compound, C6H9ClN4, contains four independent molecules (A, B, C and D). Their main difference is the torsion angles, ranging from 1.6 (5) to 5.9 (5)°, between the methyl group and the pyrimidine plane. A pair of intermolecular N—H...N hydrogen bonds link molecules A and C into a twisted dimer with a dihedral angle of 32.9 (1)° between the two pyrimidine rings, creating an R22(8) motif. In the packing, each two molecules of B, C and D form centrosymmetric dimers through two intermolecular N—H...N hydrogen bonds, locally creating R22(8) motifs. The dimers of C and D are alternately bridged by A into an infinite zigzag strip, locally creating two different R22(8) motifs with dihedral angles of 32.9 (1) and 63.4 (1)° between the pyrimidine rings. Finally, these strips together with the dimers of B associate into a complicated three-dimensional framework.