Synthesis of Hydrophilic Two-Photon Absorptive Fullerene-diphenylaminoflourene Dyads for Molecular Self-assembly in Water

摘要

Synthetic conditions for the preparation of amphiphilic two-photon absorptive poly(ethylene glycolated) diphenylaminofluorene[60]fullerene conjugates C_(60)( > DPAF-PEG_6) were investigated. UV-vis spectra of C_(60)( > DPAF-PEG_6) collected at the concentration of 1.0 x 10~(-5) M in water showed absorption bands with a slight red shift, broadened, and in a less intensity as compared with those of the bands obtained in CHCl_3. These features are important characteristics of C_(60)( > DPAF-PEG_6) molecular aggregation in water. Transmission electron micrographs taken at the concentration of 1.0 x 10~(-5) M in H_2O clearly displayed images of spherical aggregates in a diameter of 200-400 nm. That substantiated high hydrophobic intermolecular interactions between these amphiphilic molecules for assemblies in water.