Ikeuchi T, Mack J, Nyokong T, Kobayashi N, Kimura M. Aggregation Control of Robust Water-Soluble Zinc(II) Phthalocyanine-Based Photosensitizers.
LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016;
32:11980-11985. [PMID:
27775359 DOI:
10.1021/acs.langmuir.6b03552]
[Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
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.
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