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RESEARCH PRODUCT
Quantitative evaluation of the preferential orientation ofpara-phenylene vinylene pentamers in polystyrene films by optically detected magnetic resonance
August BouwenH. DetertSofie CambréJ. De CeusterEtienne Goovaertssubject
Quantitative Biology::BiomoleculesSpin coatingMaterials sciencePentamerPhysicsAnalytical chemistryZero field splittingAtomic and Molecular Physics and Opticslaw.inventionChemistrychemistry.chemical_compoundCrystallographychemistrylawPhenyleneExcited stateMoleculePolystyreneElectron paramagnetic resonancedescription
The morphology of drop-casted and spin-coated films of blends ofpara-phenylene vinylenederived pentamers with polystyrene is investigated by means of X-band optically detected magnetic resonance (ODMR) of the triplet excited states. Adapting an electron spin resonance simulation program to ODMR, the orientation distribution function of the oligomers in the films could be quantified. After drop casting or spin coating the pentamers from a solution, the oligomers tend to lie with their backbones in the plane of the film. The parameters of film preparation and the type of pentamer strongly influence the orientation distribution function. Also, the study of preferentially oriented films allows for the correlation of principal directions of the zero-field splitting tensor with characteristic directions of the molecules.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-09-01 | Applied Magnetic Resonance |