One-Step Selective Aerobic Oxidation of Amines to Imines by Gold Nanoparticle-Loaded Rutile Titanium(IV) Oxide Plasmon Photocatalyst

Naya, Shin‐ichi; Kimura, Keisuke; Tada, Hiroaki

doi:10.1021/cs300682d

Cited by 178 publications

(138 citation statements)

References 29 publications

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“…5. It is clearly shown that the photogenerated electrons of α-Fe 2 O 3 will be excited from VB to its different energy-level CB position under visible irradiation, including high-energy region (−0.05 eV ~ −1.0 eV vs SHE) and low-energy region (0.1 eV ~ −0.05 eV vs SHE) in this system21. Thus, the photogenerated electrons at low-energy level would quickly relax to the VB bottom of α-Fe 2 O 3 , then to recombine with holes.…”

Section: Discussionmentioning

confidence: 85%

Effective charge separation in the rutile TiO2 nanorod-coupled α-Fe2O3 with exceptionally high visible activities

Luan

Xie

Liu

et al. 2014

Sci Rep

100

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Herein, we have fabricated rutile TiO2 nanorod-coupled α-Fe2O3 by a wet-chemical process. It is demonstrated that the visible activities for photoelectrochemical water oxidation and for degrading pollutant of α-Fe2O3 are greatly enhanced after coupling a proper amount of rutile nanorods. The enhanced activity is attributed to the prolonged lifetime and improved separation of photogenerated charges mainly by the transient surface photovoltage responses. Interestingly, the observed EPR signals (with g⊥ = 1.963 and g|| = 1.948) of Ti3+ in the fabricated TiO2-Fe2O3 nanocomposite at ultra low temperature (1.8 k) after visible laser excitation, along with the electrochemical impedance spectra and the normalized photocurrent action spectra, testify evidently that the spacial transfers of visible-excited high-energy electrons of α-Fe2O3 to TiO2 could happen. Moreover, it is confirmed that it is more favorable for the uncommon electron transfers of α-Fe2O3 to rutile than to anatase. This is responsible for the much obvious enhancement of visible activity of Fe2O3 after coupling with rutile TiO2, compared with anatase and phase-mixed P25 ones. This work would help us to deeply understand the uncommon photophysical processes, and also provide a feasible route to improve the photocatalytic performance of visible-response semiconductor photocatalyst for water splitting and pollutant degradation.

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Section: Discussionmentioning

confidence: 85%

Effective charge separation in the rutile TiO2 nanorod-coupled α-Fe2O3 with exceptionally high visible activities

Luan

Xie

Liu

et al. 2014

Sci Rep

100

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“…Simultaneously, electrons injected into TiO 2 CB reduce O 2 preventing charge recombination. This highlighted that the synergy of anodic (amines oxidation) and cathodic (O 2 reduction) reactions was essential for the overall mechanism to proceed [112].…”

Section: Plasmon-enhanced Oxidation Reactionsmentioning

confidence: 99%

Solar-Powered Plasmon-Enhanced Heterogeneous Catalysis

et al. 2016

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Photocatalysis uses semiconductors to convert sunlight into chemical energy. Recent reports have shown that plasmonic nanostructures can be used to extend semiconductor light absorption or to drive direct photocatalysis with visible light at their surface. In this review, we discuss the fundamental decay pathway of localized surface plasmons in the context of driving solar-powered chemical reactions. We also review different nanophotonic approaches demonstrated for increasing solar-tohydrogen conversion in photoelectrochemical water splitting, including experimental observations of enhanced reaction selectivity for reactions occurring at the metalsemiconductor interface. The enhanced reaction selectivity is highly dependent on the morphology, electronic properties, and spatial arrangement of composite nanostructures and their elements. In addition, we report on the particular features of photocatalytic reactions evolving at plasmonic metal surfaces and discuss the possibility of manipulating the reaction selectivity through the activation of targeted molecular bonds. Finally, using solar-tohydrogen conversion techniques as an example, we quantify the efficacy metrics achievable in plasmon-driven photoelectrochemical systems and highlight some of the new directions that could lead to the practical implementation of solar-powered plasmon-based catalytic devices.

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“…However, there are already several examples that demonstrate the viability of using SC photocatalysts to induce organic transformations . Some specific reactions promoted by TiO 2 are the oxidation of aliphatic and aromatic systems, or alcohols; the conversion of lactic acid into acetaldehyde; the synthesis of α‐chloro aryl ketones from aryldiazonium salts and terminal alkynes; Ullmann reactions; the conversion of amines to imines; the N‐alkylation of amines with alcohols; the addition of amines to deficient alkenes; heterocyclic functionalizations; the Huisgen [3+2] cycloaddition of azides and alkynes; or the addition of thiols to alkenes …”

Section: Photocatalytic Use Of Tio2 Nanomaterials In Aqueous and Biolmentioning

confidence: 99%

TiO₂‐Based Photocatalysis at the Interface with Biology and Biomedicine

Tomás‐Gamasa

Mascareñas

2019

ChemBioChem

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The conversion of sunlight into chemical energy by using photosynthetic machinery is at the heart of nature and life. Scientists have also learned to use light energy to promote a great variety of chemical reactions, most of which are based on redox processes involving electron‐transfer steps. Indeed, the area of photoredox catalysis has recently emerged as one of the hottest fields in synthetic chemistry. Many of the photoredox reactions discovered so far take place in homogeneous phases, and rely on the use of soluble photoresponsive catalysts. However, in recent years, there have been many advances in the area of heterogeneous photocatalysis, most of which are based on the use of semiconductor materials, such as TiO2, as a key photocatalytic system. These technologies have found different applications, especially in the field of sustainable chemistry and therapy. Herein, some of these applications, and the potential of TiO2‐based photocatalysts in biology and biomedicine, are reviewed.

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One-Step Selective Aerobic Oxidation of Amines to Imines by Gold Nanoparticle-Loaded Rutile Titanium(IV) Oxide Plasmon Photocatalyst

Cited by 178 publications

References 29 publications

Effective charge separation in the rutile TiO2 nanorod-coupled α-Fe2O3 with exceptionally high visible activities

Effective charge separation in the rutile TiO2 nanorod-coupled α-Fe2O3 with exceptionally high visible activities

Solar-Powered Plasmon-Enhanced Heterogeneous Catalysis

TiO₂‐Based Photocatalysis at the Interface with Biology and Biomedicine

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One-Step Selective Aerobic Oxidation of Amines to Imines by Gold Nanoparticle-Loaded Rutile Titanium(IV) Oxide Plasmon Photocatalyst

Cited by 178 publications

References 29 publications

Effective charge separation in the rutile TiO2 nanorod-coupled α-Fe2O3 with exceptionally high visible activities

Effective charge separation in the rutile TiO2 nanorod-coupled α-Fe2O3 with exceptionally high visible activities

Solar-Powered Plasmon-Enhanced Heterogeneous Catalysis

TiO2‐Based Photocatalysis at the Interface with Biology and Biomedicine

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TiO₂‐Based Photocatalysis at the Interface with Biology and Biomedicine