Abstract
We synthesized an amphiphilic porphyrin dendrimer that possesses hydrophilic triethylene glycol chains at the end of rigid backbones and dendritic side chains. The Sonogashira coupling reaction of diethynyl Zn porphyrin and oligo(phenylene-ethylene) with hydrophilic triethylene glycol terminals afford the expected dendrimer in 80% yield, that is characterized by NMR and MALDI-TOF mass (M+ = 5971) spectroscopy. The aggregation behavior of this dendrimer in THF/water was monitored by UV-vis spectroscopy. Upon addition of water in the THF solution, broadening with red shifts of absorption bands were observed. These phenomena suggest the formation of aggregates of the dendrimers. Moreover, wire-shaped aggregations (about 5 nm diameter) in THF/water = 1/9 were observed by TEM. Detailed synthetic procedure and aggregation behaviors of the dendrimer will be presented.
