Permeable nonaggregating porphyrin thin films that display enhanced photophysical properties

Kathryn E. Splan, Joseph T Hupp

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Porphyrins bearing bulky alkoxyphenyl substituents at two of the four meso-positions and phenyl phosphonates at the other two have been prepared and used as building blocks for layer-by-layer assembly of conductive-glass- supported thin films via zirconium phosphonate chemistry. Thin-film characterization shows that the addition of sterically demanding 2,6-din-hexoxy)phenyl substituents to the meso-positions of the porphyrin skeleton can successfully prevent molecular aggregation. Both absorption and emission studies of multilayer thin films provide strong evidence that the new compounds have the ability to form thin films in which very little molecular (chromophore) interaction is present, relative to porphyrins that are not sterically hindered. Furthermore, the films are found to be permeable to selected small redox probes but blocking toward larger ones. Taken together, the sharp absorption spectra, increased emission yields, and permeability are expected to be advantageous for various materials-based applications such as photovoltaics and sensors.

Original languageEnglish
Pages (from-to)10560-10566
Number of pages7
JournalLangmuir
Volume20
Issue number24
DOIs
Publication statusPublished - Nov 23 2004

Fingerprint

Porphyrins
porphyrins
Thin films
Organophosphonates
thin films
Bearings (structural)
Multilayer films
Chromophores
musculoskeletal system
Zirconium
chromophores
Absorption spectra
permeability
Agglomeration
assembly
chemistry
absorption spectra
Glass
probes
glass

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Permeable nonaggregating porphyrin thin films that display enhanced photophysical properties. / Splan, Kathryn E.; Hupp, Joseph T.

In: Langmuir, Vol. 20, No. 24, 23.11.2004, p. 10560-10566.

Research output: Contribution to journalArticle

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