title: Aggregation Control of Robust Water-Soluble Zinc(II) Phthalocyanine-Based Photosensitizers.
abstract: A water-soluble zinc phthalocyanine (ZnPc) complex with four negatively charged electron-withdrawing sulfonic acid substituents at the nonperipheral positions (α-ZnTSPc) is found to have a high singlet oxygen (1O2) quantum yield and exhibits high photostability. The formation of aggregates is hindered and the highest occupied molecular orbital is significantly stabilized, making α-ZnTSPc potentially suitable for its use as a photosensitizer for photodynamic therapy and photoimmunotherapy. Atomic force microscopy (AFM) reveals that mixtures of the negatively charged α-ZnTSPc complex with a similar positively charged ZnPc were found to result in the self-assembly of one-dimensional accordion-like fibers. Supramolecular fibers can be formed in aqueous solutions through intermolecular electrostatic and donor-acceptor interactions between the two water-soluble ZnPcs.
authors: Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University , Ueda 386-8567, Japan.
authors: Takuro
authors: T
authors: Ikeuchi
authors: Department of Chemistry, Rhodes University , P.O. Box 94, Grahamstown 6140, South Africa.
authors: John
authors: J
authors: Mack
authors: Department of Chemistry, Rhodes University , P.O. Box 94, Grahamstown 6140, South Africa.
authors: Tebello
authors: T
authors: Nyokong
authors: Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University , Ueda 386-8567, Japan.
authors: Nagao
authors: N
authors: Kobayashi
authors: Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University , Ueda 386-8567, Japan.
authors: Mutsumi
authors: M
authors: Kimura