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1,2-Dithienylethene Photochromes and Non-destructive Erasable Memory

Myles, A.J. ; Branda, N.R.

Advanced functional materials, 2002-03, Vol.12 (3), p.167-173 [Periódico revisado por pares]

Weinheim: WILEY-VCH Verlag

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  • Título:
    1,2-Dithienylethene Photochromes and Non-destructive Erasable Memory
  • Autor: Myles, A.J. ; Branda, N.R.
  • Assuntos: Dithienylethene ; Erasable ; Non-destructive testing ; Photochromic materials
  • É parte de: Advanced functional materials, 2002-03, Vol.12 (3), p.167-173
  • Notas: istex:EEB2DCD2CC7165025E5058C06836EA74F41979B0
    ark:/67375/WNG-DHH210GH-V
    ArticleID:ADFM167
    ObjectType-Article-2
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    content type line 23
  • Descrição: Monitoring changes in ultraviolet‐visible (UV‐vis) absorption is not a viable method to process information for photochromic memory media due to the readout signal interfering with the photochromism. Only by monitoring the changes in other photophysical properties accompanying the photoisomerization reaction (refractive index, optical rotation, or luminescence, for example) can non‐destructive, all photon‐mode photochromic memory be realized. We have investigated several such systems based on 1,2‐dithienylcyclopentene derivatives, which have a backbone that we consider to be currently the most promising of the photochromes. The two readout signals highlighted in this article are luminescence and optical rotation. The luminescent systems rely on porphyrinic chromophores tethered to the photochrome directly or through dative bonds. When the macrocycles are irradiated with light at wavelengths outside the absorption range of the photochrome, luminescence is only observed when the 1,2‐dithienylcyclopentene backbone exists in its open‐state. The self‐assembly of a chiral photochromic metallo‐helicate allows for stereoselective ring‐closing of the 1,2‐dithienylcyclopentene backbone providing a change in optical rotation that can be used as a readout signal. In the article, we also describe the use of ring‐opening metathesis polymerization (ROMP) to fabricate well‐ordered photochromic homopolymers possessing identical photochromic properties as their monomers. Non‐destructive, erasable memory based on dithienylethene systems (see Figure) has been investigated. The two readout signals highlighted are luminescence and optical rotation. The use of ring‐opening metathesis polymerization (ROMP) to fabricate well‐ordered photochromic homopolymers is also described.
  • Editor: Weinheim: WILEY-VCH Verlag
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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