Photogeneration of highly absorbing transient charge states from model dendritic macromolecules based on bis-(diphenylamino) diphenylpolyene repeat units

Citation
A. Hyfield et al., Photogeneration of highly absorbing transient charge states from model dendritic macromolecules based on bis-(diphenylamino) diphenylpolyene repeat units, J NONLIN OP, 9(4), 2000, pp. 469-480
Citations number
19
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS
ISSN journal
02188635 → ACNP
Volume
9
Issue
4
Year of publication
2000
Pages
469 - 480
Database
ISI
SICI code
0218-8635(200012)9:4<469:POHATC>2.0.ZU;2-9
Abstract
Bis-(diphenylamino)diphenylpolyenes form exceptionally stable, highly absor bing, bipolaronic charge states when oxidatively doped in solution, even at the stilbene level. These chromophores also display exceptionally large tw o-photon absorption cross-sections for ns laser pulses. 1,2-Bis-(diphenylam ino)-E-stilbene moieties have now been incorporated into S-arm and four-arm dendrimer structures as formal repeat units. These new G-0 model dendrimer s also form exceptionally stable, highly-absorbing bipolaronic charge state s when oxidized in solution. As such these new materials are attractive can didates for various photonic applications which depend on the fast photogen eration of highly absorbing transient states. In the current study we have demonstrated that such states can indeed be photogenerated from the model d endrimers in solution in the presence of efficient electron accepters, such as C-60, In order to follow both the generation and decay of these excited state transient species, new spectroscopic techniques have been developed that have unique capabilities for examining transient state formation and s ubsequent dynamics.