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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Description/Abstract

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.

Item Type: Article
ISSNs: 0026-8976 (print)
1362-3028 (electronic)
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
ePrint ID: 343221
Date Deposited: 01 Oct 2012 13:35
Last Modified: 27 Mar 2014 20:25
URI: http://eprints.soton.ac.uk/id/eprint/343221

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