Hans-Christoph Weiss, Dieter Bläser, Roland Boese, Brandon M. Doughan and Michael M. Haley
The crystal structures of 1,4-diethynylbenzene 1 and 1,3,5-triethynylbenzene 2 show similar packing principles with CH···π (triple bond)-zigzag networks; surprisingly, the packing motif of ethynylbenzene 3 is quite different.