Photoinduced Electron Transfer in Zinc Phthalocyanine Loaded on Single‐Walled Carbon Nanohorns in Aqueous Solution

Sandanayaka, Atula S. D.; Ito, Osamu; Zhang, Minfang; Ajima, Kumiko; Iijima, Sumio; Yudasaka, Masako; Murakami, Tatsuya; Tsuchida, Kunihiro

doi:10.1002/adma.200901256

Cited by 45 publications

(37 citation statements)

References 39 publications

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“…On addition of HV 2 + and BNAH, the electron on CNH mediates to HV 2 + , leading to an accumulation of HVC + . From the one-electron oxidation ( % 0.4 V) and the lowest singlet excited-state energy (2.0 eV) of the ZnP, the charge-separation process becomes exothermic, if the reduction potential of CNH is less negative than À1.6 V versus Ag/AgNO 3 , which is reasonably negative enough to be compatible with the reported reduction potential of single-walled carbon nanotubes (SWCNT) of À0.6 V. [12] The intermolecular electron-mediating (EM) and hole-shifting (HS) processes with additives are also exothermic processes or almost isoenergetic processes.…”

Section: Wwwchemeurjorgsupporting

confidence: 54%

“…[28] On addition of only HV 2 + to nanohybrids, the transient spectra showed a decrease of the near-IR bands (see Figure S6 in the Supporting Information), accompanied by the rapid decay of the l = 1410 nm band, confirming the electron-mediating process from CNHC À -sp-NH 3 + to HV 2 + . [11,12] The most prominent difference is the shorter lifetime of the generated HVC + (less than 200 ns), suggesting that the back electron transfer from the CrownÀZnPC + to HV · + is working to consume HVC + .…”

Section: Wwwchemeurjorgmentioning

confidence: 99%

“…[11,12] The time profile at l = 640 nm shown in the inset of Figure 10 was curvefitted by an exponential function, giving a first-order rate constant of 1.2 10 7 s À1 for the CrownÀZnPC + moiety in Arsaturated DMF. This rate constant can be attributed to the intra-nanohybrid charge recombination (k CR ) within CNHC À -sp-NH 3 + ;Crown À ZnPC + .…”

Section: In a Control Experiments Without Cnh-sp-nhmentioning

confidence: 99%

“…[10] We also reported that the chemically modified CNHs are dispersible in organic solvents, when the attached chromophores are soluble in the solvents. [11][12][13][14] A few studies have reported the application of chemically modified CNHs in photovoltaic cells, with the porphyrins dispersible in solutions; [15] however, the maximum efficiency was relatively low compared with other nanocarbon structures.…”

Section: Introductionmentioning

confidence: 99%

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A Carbon NanohornPorphyrin Supramolecular Assembly for Photoinduced Electron‐Transfer Processes

Vizuete

Gómez‐Escalonilla

Fierro

et al. 2010

Chemistry A European J

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A supramolecular assembly of zinc porphyrin-carbon nanohorns (CNHs) was constructed in a polar solvent. An ammonium cation was covalently connected to the CNH through a spacer (sp) (CNH-sp-NH(3)(+)) and bound to a crown ether linked to a zinc porphyrin (Crown-ZnP). Nanohybrids CNH-sp-NH(3)(+);Crown-ZnP and CNH-sp-NH(3)(+) were characterized by several techniques, such as high-resolution transmission electron microscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, and Raman spectroscopy. The photoinduced electron-transfer processes of the nanohybrids have been confirmed by using time-resolved absorption and fluorescence measurements by combining the steady-state spectral data. Fluorescence quenching of the ZnP unit by CNH-sp-NH(3)(+) has been observed, therefore, photoinduced charge separation through the excited singlet state of the ZnP unit is suggested for the hybrid material, CNH-sp-NH(3)(+);Crown-ZnP. As transient absorption spectral experiments reveal the formation of the radical cation of the ZnP unit, electron generation is suggested as a counterpart of the charge-separation on the CNHs; such an electron on the CNHs is further confirmed by migrating to the hexylviologen dication (HV(2+)). Accumulation of the electron captured from HV(*+) is observed as electron pooling in solution in the presence of a hole-shifting reagent. Photovoltaic performance with moderate efficiency is confirmed for CNH-sp-NH(3)(+);Crown-ZnP deposited onto nanostructured SnO(2) films.

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Section: Wwwchemeurjorgsupporting

confidence: 54%

Section: Wwwchemeurjorgmentioning

confidence: 99%

Section: In a Control Experiments Without Cnh-sp-nhmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Carbon NanohornPorphyrin Supramolecular Assembly for Photoinduced Electron‐Transfer Processes

Vizuete

Gómez‐Escalonilla

Fierro

et al. 2010

Chemistry A European J

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“…The s-bonded platinum(II) acetylide dimers 1 a,b were synthesized in moderate yield ( % 65 %) by the coupling reaction of trans-[PtCl 2 - 2 ] with the corresponding ethynylphthalocyanines 2 a,b.…”

Section: Resultsmentioning

confidence: 99%

Assembling Phthalocyanine Dimers through a Platinum(II) Acetylide Linker

Jiménez

Marcos

Hausmann

et al. 2011

Chemistry A European J

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Phthalocyanine (Pc) dimers connected through trans-platinum(II) diacetylide linkers have been prepared by reaction of the corresponding ethynylphthalocyanines with trans-bis(triethylphosphine)platinum(II) chloride. Special emphasis was placed on the analysis of the ground- and excited-state features of these compounds in relation to butadiyne-bridged Pc dimers and the corresponding monomers. Both Zn(II)-containing Pc dimers exhibit long-lived triplet excited states. The insertion of σ-bonded trans-platinum(II) diacetylide spacers decoupled the two Pc groups and led to an appreciable acceleration (by a factor of up to 10) of the radiative and nonradiative decay rate of the singlet and triplet excited states.

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Conical Carbon Nanoparticles in Analytical Chemistry

Soto

Aranzana

2012

Encyclopedia of Analytical Chemistry

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Conical carbon nanoparticles are a particular form of open carbon nanomaterials. Their typical structure follows from the presence of pentagonal disclinations within a seamless graphene sheet. As a result, two main carbon nanostructures are obtained: carbon nanocones and carbon nanohorns. They were discovered after fullerenes and carbon nanotubes and since then, they have been extensively studied, although their analytical applications are still to be exploited. This contribution compiles the main aspects of conical carbon nanoparticles, including their synthesis and properties as well as the functionalization procedures, which are different from those proposed for other carbon nanoparticles. Finally, the most relevant applications developed up to date are commented on.

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Photoinduced Electron Transfer in Zinc Phthalocyanine Loaded on Single‐Walled Carbon Nanohorns in Aqueous Solution

Cited by 45 publications

References 39 publications

A Carbon NanohornPorphyrin Supramolecular Assembly for Photoinduced Electron‐Transfer Processes

A Carbon NanohornPorphyrin Supramolecular Assembly for Photoinduced Electron‐Transfer Processes

Assembling Phthalocyanine Dimers through a Platinum(II) Acetylide Linker

Conical Carbon Nanoparticles in Analytical Chemistry

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