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Thermal and Photochemical Properties of 4′,7‐Dihydroxyflavylium in Water–Ionic Liquid Biphasic Systems: A Write–Read–Erase Molecular Switch
Author(s) -
Pina Fernando,
Lima João C.,
Parola A. Jorge,
Afonso Carlos A. M.
Publication year - 2004
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200353131
Subject(s) - ionic liquid , metastability , salt (chemistry) , ionic bonding , chemistry , thermal , salt water , ion , chemical engineering , organic chemistry , physics , thermodynamics , engineering , catalysis , geotechnical engineering
Switching colors: 4′,7‐Dihydroxyflavylium ( A H + ) in water–ionic liquid biphasic systems can be used as a write–read–erase system. In acid media, the chalcone ( Ct ) form is soluble in ionic liquids and is thermally metastable, but reacts photochemically (write) to give the yellow flavylium salt, which can be optically read without being erased. The system is prepared for a new cycle by two consecutive pH “jumps”.