@article {6733, title = {Tuning the photochromic properties of a flavylium compound by pH}, journal = {European Journal of Organic Chemistry}, year = {2004}, note = {

ISI Document Delivery No.: 768EXTimes Cited: 13
Cited Reference Count: 28
Moncada, MC Pina, F Roque, A Parola, AJ Maestri, M Balzani, V
Pina, Fernando/C-8161-2011; Parola, A. Jorge/F-4048-2010; REQUIMTE, AL/H-9106-2013
Parola, A. Jorge/0000-0002-1333-9076;
Wiley-v c h verlag gmbh
Weinheim

}, month = {2004}, pages = {304-312}, abstract = {

We studied the intricate pH- and light-dependent network of the thermal and photochemical reactions of the 4{\textquoteright}-(dimethylamino) -7-hydroxyflavylium ion by continuous irradiation, flash photolysis, H-1 NMR spectroscopy, and stopped flow analysis. The distribution of the various forms at the pH-dependent thermodynamic equilibrium and the rates of several interconversion processes were measured. The most interesting feature of this multistate/multifunctional system is related to the possibility of pH-tuning the colour change caused by photoirradiation, because the cis-chalcone isomer, obtained from the photoisomerization of the trans-chalcone form, is spontaneously transformed into coloured species (flavylium. cation and quinoidal base) at low values of pH, but reverts back to the uncoloured trans-chalcone at high values of pH because of the low energy barrier between the cis and trans chalcone isomers. ((C) Wiley-VCH Verlag GmbH \& Co. KGaA, 69451 Weinheim, Germany, 2004).

}, isbn = {1434-193X}, url = {://WOS:000188531600007}, author = {Moncada, MC and Pina, F and Roque, A. and A. J. Parola and Maestri, M and Balzani, V.} }