Abstract
Low lying vibronics within ∼700 cm −1 above the origins of the first excited states of the two isomeric forms of metal-free phthalocyanine (H 2Pc) in mixed solvent matrix were re-examined by fluorescence excitation. Based on the obtained information, direct observation of photoisomeric transformation in the complex was made both from the fluorescence intensity decline under continuous resonance pumping and from the asymmetry of the fluorescence excitation intensity ratios upon two opposite laser scanning directions.
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