Dimeric and Tetrameric N…H, C…N and N…N Interactions Exist in the Crystal Structure of 8,16-Dimethyl-6,7,14,15-tetrahydro-7,15- methanocycloocta[1,2-b:5,6-b’]diquinoline

Substituted Diquinoline 3 was synthesized by means of Friedlander condensation. Series of crystallization experiments were performed and solvent free crystals of diquinoline 3 of X-ray quality were obtained from methanol. Compound 3 crystallized in the centrosymmetric space group P4(2)/n of the tetragonal system with unit cell parameters of: a = 11.5536(7) A, b = 11.5536(7) A, c = 13.1057(16) A, with α= 90° , β= 90°, and γ= 90°. Centrosymmetric tetramer as well as other different supramolecular motifs were observed and analysed in terms of supramolecular chemistry and crystal engineering. The observed intermolecular interactions were compared to those reported previously for 6 and 7. .