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Multistate/Multifunctional Behaviour of 4′-Hydroxy-6-nitroflavylium: A Write-Lock/Read/Unlock/Enable-Erase/Erase Cycle Driven by Light and pH Stimulation
- Source :
- Chemistry - A European Journal. 10:1519-1526
- Publication Year :
- 2004
- Publisher :
- Wiley, 2004.
-
Abstract
- We have investigated the network of reactions observed for the photochromic 4'-hydroxy-6-nitroflavylium compound in aqueous solutions upon pH changes (including pH jump and stopped flow experiments) and light excitation. The changes observed in the NMR and UV/Vis spectra allowed identification of ten different forms in which this compound can be transformed depending on the experimental conditions. Equilibrium and kinetic constants have been determined. Compared with other members of the flavylium family, 4'-hydroxy-6-nitroflavylium is characterized by a large cis--trans isomerization barrier, and a very efficient hydration reaction. These peculiar features allow writing, reading, storing and erasing photonic information on 4'-hydroxy-6-nitroflavylium by a novel cyclic process that involves the following steps: write-lock/read/unlock/enable-erase/erase.
- Subjects :
- Light
Molecular Structure
Photochemistry
Chemistry
Stereochemistry
Organic Chemistry
Acetophenones
Stereoisomerism
General Chemistry
Alkenes
Hydrogen-Ion Concentration
Nitro Compounds
Chemical reaction
Catalysis
Chemical kinetics
Kinetics
Photochromism
Ultraviolet visible spectroscopy
Reaction rate constant
Molecule
Oxidation-Reduction
Isomerization
Equilibrium constant
Subjects
Details
- ISSN :
- 15213765 and 09476539
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Chemistry - A European Journal
- Accession number :
- edsair.doi.dedup.....21f62c0cd43838af4d522a9e3ca0521d