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Issue 11, 2015
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Structure resembling effect of clay surface on photochemical properties of meso-phenyl or pyridyl-substituted monocationic antimony(V) porphyrin derivatives

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Abstract

Four types of meso-phenyl or pyridyl-substituted monocationic antimony(V) porphyrin derivatives (SbVPors)—5,10,15,20-tetraphenyl; 5,10,15-triphenyl-20-mono(4-pyridyl); 5,15-diphenyl-10,20-di(4-pyridyl); and 5,10,15,20-tetra(4-pyridyl)porphyrinato dihydroxo antimony(V) chloride—with different hydrophobicities were synthesised, and their photochemical properties on anionic clay were investigated. The absorption and fluorescence behaviour of the SbVPors were strongly affected by complex formation with clay. Interestingly, the absorption transition probabilities and fluorescence quantum yields of the SbVPors prominently increased on the clay surface. The more hydrophobic SbVPor showed greater absorption transition probability increase and fluorescence quantum yield enhancement. These unique effects of the highly flat clay surface on the photochemical behaviour of SbVPor were discussed mainly from the viewpoint of transition probability, by using the potential energy curves of SbVPor with and without clay. For the more hydrophobic SbVPor, the molecular structure of the ground and excited states on the clay surface tended to become similar because of the strong hydrophobic interaction between porphyrin and the clay surface, i.e. the ‘structure resembling effect’. This effect induces a change in the transition probabilities.

Graphical abstract: Structure resembling effect of clay surface on photochemical properties of meso-phenyl or pyridyl-substituted monocationic antimony(v) porphyrin derivatives

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Publication details

The article was received on 02 Dec 2014, accepted on 23 Dec 2014 and first published on 24 Dec 2014


Article type: Paper
DOI: 10.1039/C4RA15650A
Citation: RSC Adv., 2015,5, 8479-8485
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    Structure resembling effect of clay surface on photochemical properties of meso-phenyl or pyridyl-substituted monocationic antimony(V) porphyrin derivatives

    T. Tsukamoto, T. Shimada and S. Takagi, RSC Adv., 2015, 5, 8479
    DOI: 10.1039/C4RA15650A

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