Intramolecular Excitation Energy Transfer from Visible-light Absorbing Chlorophyll Derivatives to a Near-infrared-light Emitting Boron Dipyrromethene Moiety
Chlorophyll-a derivatives were covalently linked with a π-extended boron aza-dipyrromethene moiety. In the synthetic dyads, photoinduced energy transfer from the former visible-light absorbing chlorin chromophore to the latter highly fluorescent unit in the near-infrared region was observed in a solution. The singlet-excited states of both the units were partially quenched by the charge-separated state, which was pronounced in polar organic solvents.