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The crystalline structure of the phenazine overlayer physisorbed on a graphite surface
- Source :
- Molecular Physics. 111:3823-3830
- Publication Year :
- 2013
- Publisher :
- Informa UK Limited, 2013.
-
Abstract
- The monolayer crystal structure of phenazine adsorbed on graphite is determined by a combination of synchrotron X-ray diffraction and DFT calculations. The molecules adopt a rectangular unit cell with lattice parameters a = 13.55 Å and b = 10.55 Å, which contains 2 molecules. The plane group of the unit cell is p2gg, and each molecule is essentially flat to the plane of the surface, with only a small amount of out-of-plane tilt. Density Functional Theory (DFT) calculations find a minimum energy structure with a unit cell which agrees within 7.5% with that deduced by diffraction. DFT including dispersion force corrections (DFT+D) calculations help to identify the nature of the intermolecular bonding. The overlayer interactions are principally van der Waals, with a smaller contribution from weak C-H•••N hydrogen bonds. This behaviour is compared with that of 4,4’-bipyridyl.
- Subjects :
- Chemistry
phenazine
Intermolecular force
Biophysics
Crystal structure
Condensed Matter Physics
DFT
London dispersion force
Overlayer
Crystallography
symbols.namesake
Physisorption
physisorption
monolayer
synchrotron
symbols
Molecule
Density functional theory
Physical and Theoretical Chemistry
van der Waals force
Molecular Biology
Subjects
Details
- ISSN :
- 13623028 and 00268976
- Volume :
- 111
- Database :
- OpenAIRE
- Journal :
- Molecular Physics
- Accession number :
- edsair.doi.dedup.....508dd5e08b11a6e024cce7f918688daa