Syntheses and characterization of star-shaped opto-electronic materials for H-bonding induced self-assembly

A series of star-shaped opto-electronic molecules end-capped with hydrogen bonding groups were synthesized. One, two and three carboxyl terminal groups were introduced into star-shaped oligofluorenes, respectively; and more planar core structure truxene with 1,3,5-triazine-2,4-diamine end-groups was also designed and synthesized for systematic research and comparison. The optical properties of these molecules were characterized by UV-Vis and fluorescence spectra, which implied that the star-shaped core and the long alkane side chains could substantially suppress the intermolecular π-π aggregation. These molecules would be good candidates for hydrogen bonding induced self-assembly materials on graphite or a metal surface.