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

Joakim Andréasson (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; Terazono Yuichi ; Mattias P. Eng (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; Ana L. Moore ; Thomas A. Moore ; Devens Gust
Dyes and Pigments (0143-7208). (2011)
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Chromophores; Molecular devices; Photochemistry; Photochromism; Porphyrinoids; Logic gates



Denna post skapades 2010-10-12. Senast ändrad 2012-09-19.
CPL Pubid: 127497

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)

Ämnesområden

Spektroskopi
Fysikalisk organisk kemi

Chalmers infrastruktur