The rare 4 < sup > 2 < /sup > .6 < sup > 3 < /sup > .8 network and a chiral, trigonal net in crystal structures of 1,3,5-tris(4-pyridyl)benzenes

Abstract

1,3,5-tris[4-Pyridyl(ethenyl)]benzene (1) functions as a four-connected node in the first organic example of 42.63.8 network (SrAl2 type) sustained by weak Câ€"H⋯N hydrogen bonds. 1,3,5-tris[4-Pyridyl(ethyl)]benzene (2) crystallizes in a chiral, trigonal 3,6 network that is characteristic of octupolar NLO materials. These network topologies are atypical compared to the more common hexagonal packing of trigonal molecules. © The Royal Society of Chemistry 2005.