The importance of π–π, π–CH and N–CH interactions in the crystal packing of Schiff-base derivatives of cis,cis- and cis,trans-1,3,5-triaminocyclohexane
Abstract
The crystal structures of cis,trans-1,3,5-tris-benzaldimino-cyclohexane (trans-tbc, 1), cis,trans-1,3,5-tris-(pyridine-2-carboxaldimino)-cyclohexane (trans-ttop, 2), cis,cis-1,3,5-tris-(pyridine-3-carboxaldimino)-cyclohexane (cis-mttop, 3) and cis,trans-1,3,5-tris-(pyridine-4-carboxaldimino)-cyclohexane (trans-pttop, 4) are reported. The arrangements of the molecules forming the packed arrays are controlled by the interplay of several different weak intermolecular interactions: π–π stacking, C–H⋯π and C–H⋯N interactions, and these are in turn related to differences in the stereochemistry around the cyclohexane backbone, as well as the positioning of the