Solubilization of a π-conjugating hydrophobic dendrimer in aqueous media.
Phenylazomethine dendrimers, which can be used as the template for precise metal nanoparticles, are soluble only in aprotic media. The use of a specific surfactant enabled their solubilization in aqueous solutions. Under dilute condition, they formed discrete micelles with a size close to the that of the dendrimer. Condensation resulted in their aggregation; however, they remained in a homogeneous solution without precipitation. Furthermore, each micelle was well isolated. The triplet-excited state of the zinc porphyrin core in the micelles was significantly stable, suggesting the formation of rigid core-shell micelles preventing any external molecules from approaching to the core.
Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama, 226-8503, Japan.
Takane
T
Imaoka
Makoto
M
Katsurayama
Yoshinori
Y
Yamanoi
Hiroshi
H
Nishihara
Kimihisa
K
Yamamoto
D001391:Azo Compounds / Q000737:chemistry; D050091:Dendrimers / Q000737:chemistry*; D004735:Energy Transfer; D057927:Hydrophobic and Hydrophilic Interactions; D053768:Metal Nanoparticles / Q000737:chemistry; D008665:Metalloporphyrins / Q000737:chemistry; D008823:Micelles; D011166:Porphyrins / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry; D014867:Water / Q000737:chemistry*
D001391:Azo Compounds; D050091:Dendrimers; D008665:Metalloporphyrins; D008823:Micelles; D011166:Porphyrins; D013501:Surface-Active Agents; C506824:phenylazomethine; D014867:Water; C017802:zinc hematoporphyrin