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    Adsorption and absorption behavior of cationic porphyrin on titania and clay nanosheets

    Year: 2021

    Journal: Colloid Surf. A-Physicochem. Eng. Asp., Volume 624, SEP 5

    Authors: Hirade, Yugo; Ishida, Tamao; Shimada, Tetsuya; Takagi, Shinsuke

    Organizations: [25107521]

    Keywords: Inorganic/organic complex; Porphyrin; Titania nanosheet; Clay nanosheet; Size-matching effect

    In this study, the adsorption and absorption behavior of porphyrin derivatives on inorganic nanosheets were investigated. The relationship between the adsorption orientation angle (theta(ad)) and the maximum absorption wavelength (lambda(max)) of tetra (N-methyl-4-pyridinium)-porphyrin (p-TMPyP4+) derivatives adsorbed on clay nanosheet (Sumecton SA (SSA)) and titania nanosheet (TNS, Ti-0.89 square O-0.11(2)-0.11) monolayer film prepared by the Langmuir-Blodgett method was examined by dichroic waveguide spectroscopy. The lambda(max) of each TMPyP4+ was red-shifted by an adsorption on the nanosheets. For example, the lambda(max) of p-TMPyP4+ in water was 422 nm, while that was shifted to 450 and 459 nm upon an adsorption on SSA and TNS, respectively. According to dichroic measurements, the theta(ad) of p-TMPyP4+ was estimated to be 13 and 3 degrees on SSA and TNS, respectively. Judging from the results for all porphyrin, a strong correlation between the lambda(max) shift upon an adsorption and the theta(ad) on nanosheets was found out. In addition, it was turned out that the theta(ad) depends on the electrostatic interactions between porphyrin and anionic nanosheets. Thus, the lambda(max) shift upon an adsorption can be controlled by the combination of porphyrin and nanosheet.
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