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Large Footprint Pyrene Chromophores Anchored to Planar and Colloidal Metal Oxide Thin Films

Thyagarajan, S.; Galoppini, Elena; Persson, Petter LU ; Giamuccio, J. M. and Meyer, G. J. (2009) In Langmuir 25(16). p.9219-9226
Abstract
Sensitization and binding of a large footprint pyrene chromophore to planar (sapphire) and colloidal metal oxide films (TiO2 and ZrO2) is investigated. The model compound combines a 1-pyrenyl-ethynylenephenylene unit with a new adamantane-tripodal linker that binds to the surface. The linker design, combining a large footprint (2 nm2) of the tripodal linker with the meta position of the COOH anchoring groups, was suggested from atomistic models, and it aims to provide improved spacing control. The pyrene chromophore unit provides a probe of sensitizer−sensitizer interactions through its propensity to form excimers, unless neighboring pyrene units are sufficiently spaced (≥3.5 Å). Absorption and fluorescence studies, and a comparison with a... (More)
Sensitization and binding of a large footprint pyrene chromophore to planar (sapphire) and colloidal metal oxide films (TiO2 and ZrO2) is investigated. The model compound combines a 1-pyrenyl-ethynylenephenylene unit with a new adamantane-tripodal linker that binds to the surface. The linker design, combining a large footprint (2 nm2) of the tripodal linker with the meta position of the COOH anchoring groups, was suggested from atomistic models, and it aims to provide improved spacing control. The pyrene chromophore unit provides a probe of sensitizer−sensitizer interactions through its propensity to form excimers, unless neighboring pyrene units are sufficiently spaced (≥3.5 Å). Absorption and fluorescence studies, and a comparison with a pyrene−rigid rod model compound, suggest that the new tripodal anchor group allows spacing control on planar surfaces. On colloidal films, the linker provides spacing control at low surface coverage but sensitizer−sensitizer interactions are still observed on colloidal films at high surface coverage. Implications for the functionalization of metal oxide films in hybrid molecule−metal oxide semiconductor material systems are discussed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
25
issue
16
pages
9219 - 9226
publisher
The American Chemical Society
external identifiers
  • wos:000268719900057
  • scopus:68649109854
ISSN
0743-7463
DOI
10.1021/la9007679
language
English
LU publication?
yes
id
6081c59b-6328-491f-be9a-4c4708dcb4a5 (old id 1457484)
date added to LUP
2009-09-01 14:31:15
date last changed
2017-10-01 03:46:24
@article{6081c59b-6328-491f-be9a-4c4708dcb4a5,
  abstract     = {Sensitization and binding of a large footprint pyrene chromophore to planar (sapphire) and colloidal metal oxide films (TiO2 and ZrO2) is investigated. The model compound combines a 1-pyrenyl-ethynylenephenylene unit with a new adamantane-tripodal linker that binds to the surface. The linker design, combining a large footprint (2 nm2) of the tripodal linker with the meta position of the COOH anchoring groups, was suggested from atomistic models, and it aims to provide improved spacing control. The pyrene chromophore unit provides a probe of sensitizer−sensitizer interactions through its propensity to form excimers, unless neighboring pyrene units are sufficiently spaced (≥3.5 Å). Absorption and fluorescence studies, and a comparison with a pyrene−rigid rod model compound, suggest that the new tripodal anchor group allows spacing control on planar surfaces. On colloidal films, the linker provides spacing control at low surface coverage but sensitizer−sensitizer interactions are still observed on colloidal films at high surface coverage. Implications for the functionalization of metal oxide films in hybrid molecule−metal oxide semiconductor material systems are discussed.},
  author       = {Thyagarajan, S. and Galoppini, Elena and Persson, Petter and Giamuccio, J. M. and Meyer, G. J.},
  issn         = {0743-7463},
  language     = {eng},
  number       = {16},
  pages        = {9219--9226},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Large Footprint Pyrene Chromophores Anchored to Planar and Colloidal Metal Oxide Thin Films},
  url          = {http://dx.doi.org/10.1021/la9007679},
  volume       = {25},
  year         = {2009},
}