Naphthalene-1,8-diamine–2-(pyrimidin-2-yl)-1H-perimidine (2/1)

In the title adduct the pyrimidine ring is nearly co-planar with the heteroatomic perimidine ring. The perimidine and diaminonaphthalene molecules are linked by N—H••••N hydrogen bonds across an inversion center. In the crystal, alternating layers of the perimidine and the aminonaphthalene molecules are formed along [100]. In the perimidine layer the molecules are stacked along the c axis direction with an interplane separation of approximately 3.4 A ˚ .