Photoinduced Electron Transfer between the Anionic Porphyrins and Viologens in Titania Nanosheets and Monodisperse Mesoporous Silica Hybrid Films

Yui, Tatsuto; Kobayashi, Yuka; Yamada, Yuri; Yano, Koichiro; Fukushima, Yoshiaki; Torimoto, Tsukasa; Takagi, Katsuhiko

doi:10.1021/am101281n

Cited by 35 publications

(25 citation statements)

References 79 publications

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“…Clay minerals (saponite): Sumecton SA was received from Kunimine Industries Co., Ltd. Dihydroxo (5,10,15,20- 2 ]Cl, denoted as Sb V TPyP) were synthesised following the procedure described in the ESI. † UV-visible absorption spectra were measured on a Shimadzu UV-3150 spectrophotometer.…”

Section: Methodsmentioning

confidence: 99%

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

2015

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Four types of meso-phenyl or pyridyl-substituted monocationic antimony(V) porphyrin derivatives (Sb V Pors)-5, 10,15,20-tetraphenyl; 5,10,15-triphenyl-20-mono(4-pyridyl); 5,15-diphenyl-10,20-di(4pyridyl); 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 Sb V Pors were strongly affected by complex formation with clay. Interestingly, the absorption transition probabilities and fluorescence quantum yields of the Sb V Pors prominently increased on the clay surface. The more hydrophobic Sb V Por 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 Sb V Por were discussed mainly from the viewpoint of transition probability, by using the potential energy curves of Sb V Por with and without clay. For the more hydrophobic Sb V Por, 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. † Electronic supplementary information (ESI) available: The structure of synthetic saponite (Fig. S1), the plot of (3 a /3 b ) C /(3 a /3 b ) W versus f C /f W for Sb V Pors (Fig. S2), and the section entitled "The synthesis of Sb V Pors" are available. See

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Section: Methodsmentioning

confidence: 99%

“…The radiative deactivation rate constants (k f ) were calculated by using the F f and s values according to eqn (2), and are shown in Table 3. The ratios of k C f and k W f are also shown in Table 3 to discuss the effects of clay in detail.…”

Section: Compoundmentioning

confidence: 99%

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

2015

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“…Practical application of photocatalysts in converting solar light to chemical energy has been an attractive research field [1][2][3][4][5][6][7][8][9][10][11]. Water splitting over photoirradiated semiconductor photocatalysts has become an important issue world wide [12][13][14][15][16][17][18][19][20] because hydrogen is a promising alternative fuel when fossil fuels become depleted.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic reduction of CO2 over exposed-crystal-face-controlled TiO2 nanorod having a brookite phase with co-catalyst loading

Ohno

Higo

Murakami

et al. 2014

Applied Catalysis B: Environmental

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Photocatalytic reduction of carbon dioxide (CO2) was carried out using exposed-crystalface-controlled titanium(IV) oxide (TiO2) having a brookite phase. Methanol (CH3OH) was detected as the main product, and trace amounts of formic acid, carbon monoxide, methane, and hydrogen were also detected in some cases. The prepared nanorod-shaped brookite TiO2 with large {210} and small {212} exposed crystal faces showed larger CH3OH generation than that of commercial brookite TiO2 powder (Kojundo Chemical Laboratory Co., Ltd.). The activity of a brookite TiO2 nanorod for CO2 reduction depended on its aspect ratio because the {210} crystal faced worked as a reduction site, whereas an oxidation site was assigned to {212} crystal faces. Photodeposition of gold (Au) or silver (Ag) nanoparticles on the nanorod-shaped brookite TiO2 induced a dramatic increase in CH3OH production because the deposited metal particles work as reductive sites for multi-electron reduction of CO2. Among the co-catalyst-loaded brookite TiO2 nanorods, nanorod-shaped brookite TiO2 loaded with Ag showed higher activity. The source of carbon of CH3OH obtained by CO2 reduction is discussed on the basis of results of a labeling experiment using 13 CO2.

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“…We have reported the first in situ synthesis of copper nanoparticles (CuNPs) 21 within the interlayer space of LMOS (titania nanosheet; TNS [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] ) transparent films through very simple steps. However, the details of the synthetic procedures and the characterization of the other noble MNPs and TNS hybrids have not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

“…21,24,25,27,29 film was soaked in an aqueous solution of HAuCl 4 (25 mM for 24 hr). Adsorption of gold species within the TNS was confirmed by energy dispersive X-ray spectrometry (EDS) analysis, which provided clear signals for Ti and Au; the atomic ratio of Ti:Au was estimated to be 1:0.08.…”

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confidence: 99%

<em>In Situ</em> Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

Sasaki

Matsubara

Kawamura

et al. 2017

JoVE

Self Cite

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Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs within the interlayer space of semiconducting layered titania nanosheet (TNS) films was investigated here. Two types of intermediate films (i.e., TNS films containing methyl viologen (TNS/MV) and 2-ammoniumethanethiol (TNS/2-AET)) were prepared. The two intermediate films were soaked in an aqueous tetrachloroauric(III) acid (HAuCl4) solution, whereby considerable amounts of Au(III) species were accommodated within the interlayer spaces of the TNS films. The two types of obtained films were then soaked in an aqueous sodium tetrahydroborate (NaBH4) solution, whereupon the color of the films immediately changed from colorless to purple, suggesting the formation of AuNPs within the TNS interlayer. When only TNS/MV was used as the intermediate film, the color of the film gradually changed from metallic purple to dusty purple within 30 min, suggesting that aggregation of AuNPs had occurred. In contrast, this color change was suppressed by using the TNS/2-AET intermediate film, and the AuNPs were stabilized for over 4 months, as evidenced by the characteristic extinction (absorption and scattering) band from the AuNPs.

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Photoinduced Electron Transfer between the Anionic Porphyrins and Viologens in Titania Nanosheets and Monodisperse Mesoporous Silica Hybrid Films

Cited by 35 publications

References 79 publications

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

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

Photocatalytic reduction of CO2 over exposed-crystal-face-controlled TiO2 nanorod having a brookite phase with co-catalyst loading

<em>In Situ</em> Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

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