Cover Picture: Pyrromethene Dialkynyl Borane Complexes for “Cascatelle” Energy Transfer and Protein Labeling (Angew. Chem. Int. Ed. 24/2005)

Abstract

An energy‐cascade device is created by linking ethynylpyrene fragments to boron centers. The cover picture shows such a Bodipyrene dye in which irradiation of the pyrene moiety gives a virtual Stokes shift of 10 000 cm−1. The background shows a 3D plot of a fluorescence well containing femtomolar amounts of labeled biomaterial. In their Communication on page 3694 ff., G. Ulrich, R. Ziessel, and co‐workers describe how biomolecules can be labeled with these dyes, which are very promising for fluorescence imaging.