Supersonic jet spectroscopy of parent hemiporphycene: Structural assignment and vibrational analysis for S and S1 electronic states
Hemiporphycene (HPc), a constitutional isomer of porphyrin, is studied under supersonic
expansion conditions by means of laser-induced fluorescence, visible-visible hole-burning
experiments, single vibronic level fluorescence techniques, and quantum chemical
calculations. Only one trans form of jet-cooled HPc is observed, in contrast to solution
studies that evidence a mixture of two trans tautomeric forms separated in energy by∼ 1
kcal/mol. Reliable structural assignment is provided by simulating absorption and emission …
expansion conditions by means of laser-induced fluorescence, visible-visible hole-burning
experiments, single vibronic level fluorescence techniques, and quantum chemical
calculations. Only one trans form of jet-cooled HPc is observed, in contrast to solution
studies that evidence a mixture of two trans tautomeric forms separated in energy by∼ 1
kcal/mol. Reliable structural assignment is provided by simulating absorption and emission …
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