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Formation of a Hybrid Compound Composed of a Saddle-Distorted Tin(IV)−Porphyrin and a Keggin-Type Heteropolyoxometalate To Undergo Intramolecular Photoinduced Electron Transfer

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Department of Material and Life Science, Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
§ X-ray Research Laboratory, Rigaku Corporation, 3-9-12 Matsubara, Akishima-shi, Tokyo 196-68666, Japan
Department of Bioinspired Chemistry, Ewha Womans University, Seoul 120-750, Korea
Cite this: J. Phys. Chem. A 2011, 115, 6, 986–997
Publication Date (Web):January 26, 2011
https://doi.org/10.1021/jp109863d
Copyright © 2011 American Chemical Society
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Abstract

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Nonplanar Sn(IV)−porphyrin complexes, [Sn(TMPP(Ph)8)-Cl2] (1) and [Sn(TMPP(Ph)8)(OMe)2] (2) (TMPP(Ph)8: 5,10,15,20-tetrakis(4-methoxyphenyl)-2,3,7,8,12,13,17,18-octaphenylporphyrinato), were prepared and characterized by spectroscopic and electrochemical methods together with X-ray crystallography. Variable-temperature 1H NMR study revealed that the coordination of the methoxo ligand of 2 is weak enough in solution to enhance the axial ligand exchange with a Keggin-type phosphotungstate (α-[PW12O40]3−) due to the steric stress between the axial methoxo ligand and the peripheral phenyl groups of the porphyrin ligand. The formation of a novel 1:1 donor−acceptor complex, [Sn(TMPP(Ph)8)(OMe)(α-[PW12O40])]2− (4) was confirmed by 1H NMR and UV−vis spectral titrations, and also by MALDI-TOF-MS measurements. Electrochemical measurements for the donor−acceptor complex in PhCN revealed that the Sn(IV)−TMPP(Ph)8 moiety acts as an electron donor and the α-[PW12O40]3− moiety acts as an electron acceptor and that the energy level of the electron-transfer (ET) state of the 1:1 complex (1.17 eV) is lower than that of the triplet excited states of the SnTMPP(Ph)8 complex (1.31 eV). Femtosecond and nanosecond laser flash photolysis measurements indicate that intersystem crossing from the singlet excited sate to the triplet excited state occurs followed by intramolecular photoinduced electron transfer from the triplet excited state of the Sn(IV)−TMPP(Ph)8 moiety to the α-[PW12O40]3− moiety in the 1:1 complex in benzonitrile.

Supporting Information

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Details of crystallographic analysis, crystallographic data in CIF format, displacements of atoms from the least-squares in porphyrin cores for 1 and 2, MALDI-TOF-MS spectra, femtosecond transient absorption spectra of 1 in PhCN at room temperature. This material is available free of charge via the Internet at http://pubs.acs.org.

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  20. Kenji Ohashi, Hiroyuki Takeda, Kazuhide Koike, Osamu Ishitani. Synthesis and strong photooxidation power of a supramolecular hybrid comprising a polyoxometalate and Ru( ii ) polypyridyl complex with zinc( ii ). Faraday Discussions 2015, 185 , 171-185. https://doi.org/10.1039/C5FD00080G
  21. Tomoya Ishizuka, Shunichi Fukuzumi, Takahiko Kojima. Molecular assemblies based on strong axial coordination in metal complexes of saddle-distorted dodecaphenylporphyrins. Journal of Porphyrins and Phthalocyanines 2015, 19 (01-03) , 32-44. https://doi.org/10.1142/S1088424615500273
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