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Photochemistry of Fluorescent Azobenzenes Substituted with Azulenylpyridine Moiety

Fluorescent properties and the photoisomerization behaviour of 4-azulenylpyridine-substituted azobenzenes were investigated. All studied compounds have shown fluorescent emission in solution, originating from excited singlet state S2 → S0 of azulene moiety. The substitution of the azobenzene chromophore has affected the preservation of the fluorescence emission in thin films prepared in PMMA matrix. Correlation of absorption spectra with 1H–NMR spectroscopy revealed that for all compounds the E → Z isomerization takes place upon exposure to UV light.