2‐(Hydroxyimino)aldehydes: photochemical and physico‐chemical properties of a versatile functional group for monomer design
In the context of our research on stimuli-responsive polymers bearing the 2-(hydroxyimino)aldehyde (HIA) 2 group, we explore the photochemical behavior and physico-chemical properties of a number of HIAs. Interpretation of experimental data is supported by quantum mechanical calculations. HIAs are expected to undergo photoisomerization, chelate metal ions, yield hydrogen-bonded dimers or oligomers, exhibit relatively low pKas, and form >C=NO• radicals through OH hydrogen abstraction or oxidation of the oximate ion.