Ethynyl–Boron Subphthalocyanines Displaying Efficient Cascade Energy Transfer and Large Stokes Shifts


  • This work was supported by the Centre National de la Recherche Scientifique and the Ministère de la Recherche et des Nouvelles Technologies. We are indebted to Prof. J. Harrowfield for his comments on the manuscript.


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A new class of luminescent dyes incorporates aromatic residues attached by an ethynyl link to the boron center of a subphthalocyanine (SubPc; see picture). Efficient energy transfer from energy-donor subunits to the SubPc produces very large Stokes shifts, while luminescence quantum yields are maintained. An acid-triggered “switching on” of SubPc emission occurs when a dibutylamino fragment is axially coordinated to the SubPc.