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The mol-ecular structure of trans -bis-(pyridin-3-yl)ethyl-ene ( 3,3'-bpe ), C 12 H 10 N 2 , as determined by single-crystal X-ray diffraction is reported. The mol-ecule self-assembles into two dimensional arrays by a combination of C-H⋯N hydrogen bonds and edge-to-face C-H⋯ π inter-actions that stack in a herringbone arrangement perpendicular to the crystallographic c -axis. The supra-molecular forces that direct the packing of 3,3'-bpe as well as its packing assembly within the crystal are also compared to those observed within the structures of the other symmetrical isomers trans -1,2-bis-( n -pyrid-yl)ethyl-ene (  n  ,  n   '-bpe , where n = n ' = 2 or 4).

acta crystallographica. section e, crystallographic communications

X-ray crystal structure of trans-bis(pyridin-3-yl)ethylene: comparing the supramolecular structural features among the symmetrical bis(n-pyridyl)ethylenes (n = 2, 3, or 4) constitutional isomers