Abstract
AbstractA new amphiphilic BF2‐azadipyrromethene (aza‐BODIPY) dye 1 has been synthesized using a CuI‐catalyzed “click” reaction. For this dye, two self‐assembly pathways that lead to different type of J‐aggregates with distinct near‐infrared optical properties have been discovered. The metastable off‐pathway product displays a broad, structureless absorption band while the thermodynamically stable on‐pathway aggregate exhibits the characteristic spectral features of a J‐aggregate, that is, red‐shifted intense absorption band with significantly narrowed linewidth. The morphology and structure of the aggregates were studied by atomic force microscopy, transmission and scanning electron microscopy. The aggregation processes of 1 were investigated by temperature‐ and concentration‐dependent UV/Vis spectroscopy and evaluated by models for cooperative self‐assembly.
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