Beilstein J. Org. Chem.2021,17, 166–185, doi:10.3762/bjoc.17.17
pH-responsive nano-assemblies with switchable size and structure are formed by the association of a photoacid, anthocyanidin, and a linear polyelectrolyte in aqueous solution. Specifically, anionic disulfonated naphthol derivatives, neutral hydroxyflavylium, and cationic poly(allylamine) are used as
particles, and information on the molecular structure was gained by UV–vis spectroscopy. Isothermal titration calorimetry (ITC) provided information on the thermodynamics and interaction forces in the supramolecular assembly formation.
Keywords: electrostatic self-assembly; hydroxyflavylium
, systems which respond to more than one external trigger have become of great interest [68][69][70][71][72][73].
Hydroxyflavylium cations can exhibit a network of different chemical reactions enabling these molecules to perform as a molecular level optical memory [74][75][76][77][78]. The network of
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Graphical Abstract
Scheme 1:
The chemical network of reactions for 4-hydroxyflavylium (left) and the write-lock-erase cycle (rig...
Beilstein J. Org. Chem.2017,13, 203–212, doi:10.3762/bjoc.13.23
][34]. The change of acidity, however, depends on the actual complex structure. For example, it was demonstrated in a comparative study of 2-naphthol and a hydroxyflavylium derivative that the ESPT is suppressed upon complexation with CB[7] if the hydroxy functionality is embedded deeply in the host
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Graphical Abstract
Figure 1:
Structures of quinolizinium derivatives 1a–c and 2.