Brewer, Adam Y., Friscic, Tomislav, Day, G.M., Overvoorde, Lois M., Parker, Julia E., Richardson, Chris N. and Clarke, Stuart M.
The monolayer structure of 1,2-bis(4-pyridyl)ethylene physisorbed on a graphite surface
Molecular Physics, . (doi:10.1080/00268976.2012.702229).
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The crystalline monolayer of 1,2-bis(4-pyridyl)ethylene physisorbed on a graphite surface at 0.44 monolayers coverage has been observed and characterized by synchrotron X-ray diffraction and differential scanning calorimetry. The experimentally determined monolayer structure has p2 symmetry with lattice parameters a?=?17.77?Å, b?=?13.69?Å and ??=?39.7°. The unit cell contains two molecules, which are oriented in a plane parallel to the surface. It is proposed that the molecules are arranged such that they are able to form a weak C–H?···?N hydrogen bond between pyridine groups. The monolayer melts at 414?K, which is unusually close to the bulk melting point for a sub-monolayer coverage system. This molecule is chiral when adsorbed on the surface, but both isomers appear in the unit cell leading to no overall chirality in the monolayer.
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