The monolayer structure of 1,2-bis(4-pyridyl)ethylene physisorbed on a graphite surface
Brewer, Adam Y., Friscic, Tomislav, Day, G.M., Overvoorde, Lois M., Parker, Julia E., Richardson, Chris N. and Clarke, Stuart M. (2012) The monolayer structure of 1,2-bis(4-pyridyl)ethylene physisorbed on a graphite surface. Molecular Physics, 1-7. (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 ν = 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.
|Keywords:||monolayer, synchrotron, physisorption, 1,2-bis(4-pyridyl)ethylene, graphite|
|Subjects:||Q Science > QC Physics
Q Science > QD Chemistry
|Divisions:||Faculty of Natural and Environmental Sciences > Chemistry
Faculty of Natural and Environmental Sciences > Chemistry > Molecular Assembly, Function & Structure
Faculty of Natural and Environmental Sciences > Chemistry > Structure & Materials Group
|Date Deposited:||01 Oct 2012 13:35|
|Last Modified:||01 Oct 2012 13:35|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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