Self-assembly of charged bodipy dyes to form cassettes that display intracomplex electronic energy transfer and accrete into liquid crystals
Self-assembly of charged bodipy dyes to form cassettes that display intracomplex electronic energy transfer and accrete into liquid crystals
Red- and blue-absorbing boron dipyrromethene dyes, bearing opposite electronic charges, associate in solution to form a 1:2 complex having a stability constant of ca. 10 17 M -2. The complex can be dismantled by addition of a large excess of tetra-N-butylammonium cations. The same complex displays liquid crystalline properties on heating from rt to above 150 °C, as characterized by various experimental techniques. Highly efficient electronic energy transfer from the red to the blue dye occurs in both the initial complex and the subsequent mesomorphic state. © 2012 American Chemical Society.
We thank the Centre National de la Recherche Scientifique (CNRS) and the Royal Saudi Government for financial support of this work. J.B. acknowledges the UE (FEDER funds) and the Spanish Government (CTQ2009-09030 project).
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