Polarized Spectroscopy Studies of Single Molecules of Porphycenes: Tautomerism and Orientation †
2009
Using ambient atmosphere instead of pure nitrogen environment enabled efficient recording of room temperature fluorescence from single molecules of porphycenes,
chromophoreswith a high triplet formation efficiency. Double hydrogen transfer between two chemically identical trans
tautomershas been demonstrated for parent porphycene and three alkyl derivatives by the analysis of spatial patterns of the emission obtained after
raster scanningthe sample excited with an appropriately polarized laser beam. Because of tautomerization, fluorescence in porphycenes is due to two nearly orthogonal
transition dipole moments. This property allows the spatial orientation of the single molecule
chromophoresto be determined using radially and azimuthally polarized laser beams as excitation sources.
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