Formation of Two-Dimensional Supramolecular Polymers by Amphiphilic Pyrene Oligomers

摘要

Organic π-conjugated molecules are attractive objects in the materials sciences. The properties of dye aggregates critically depend on the degree of structural order. Control of the precise arrangement of chromophores into dimensionally and morphologically defined shapes is a key aspect in the development of optoelectronic devices. Close spatial proximity and in-plane alignment of chromophores in 2D structural motifs often results in distinct electronic interactions between the partners leading to charge separation and transport, directional energy transfer, new optical and photophysical properties not observed in the separate molecules. Moreover, spectroscopic changes often provide valuable information about the relative orientation of adjacent chromophores in a given environment. Among the most prominent examples of electronic interactions with pronounced effects is the formation of J- and H-aggregates.The type of aggregation strongly depends on the geometry and orientation of the interacting molecules as described by the theory of exciton coupling.