A dihydroindolizine-porphyrin dyad as molecule-based all-photonic and and NAND gates

Joakim Andréasson, Yuichi Terazono, Mattias P. Eng, Ana Moore, Thomas Moore, Devens Gust

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


A molecular dyad consisting of a photochromic dihydroindolizine unit covalently linked to a porphyrin performs, when illuminated through a third-harmonic-generating crystal, the functions of both an AND and a NAND Boolean logic gate with shared all-optical inputs. The NAND gate is of particular interest as it is a so-called universal gate, and hence all other digital systems can be implemented by combinations of NAND gates. The functions of the AND and the NAND gates rely on changes in absorption and emission of the dyad in the visible spectral region upon isomerization of the photochromic unit. The change in absorption which forms the basis for the AND gate function is ascribed to the colorization/decolorization of the photochrome itself in response to the optical inputs. The variation in emission intensity which constitutes the NAND gate function is a result of the changes in redox properties of the photochrome that follow upon isomerization, such that only one of the two isomers is competent to quench the porphyrin emission by electron transfer.

Original languageEnglish (US)
Pages (from-to)284-289
Number of pages6
JournalDyes and Pigments
Issue number3
StatePublished - Jun 2011


  • Chromophores
  • Logic gates
  • Molecular devices
  • Photochemistry
  • Photochromism
  • Porphyrinoids

ASJC Scopus subject areas

  • General Chemical Engineering
  • Process Chemistry and Technology


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