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Articoli di riviste sul tema "Asymmetric photocatalysis"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

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1

Kang, Xing, Xiaowei Wu, Xing Han, Chen Yuan, Yan Liu e Yong Cui. "Rational synthesis of interpenetrated 3D covalent organic frameworks for asymmetric photocatalysis". Chemical Science 11, n. 6 (2020): 1494–502. http://dx.doi.org/10.1039/c9sc04882k.

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Covalent organic frameworks (COFs) show great promise as heterogeneous photocatalysts, but they have not yet been explored for asymmetric photocatalysis, which is important for the sustainable production of pharmaceuticals and fine chemicals.

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Cao, Nan, Meilan Xi, Xiaoli Li, Jinfang Zheng, Limei Qian, Yitao Dai, Xizhong Song e Shengliang Hu. "Recent Developments in Heterogeneous Photocatalysts with Near-Infrared Response". Symmetry 14, n. 10 (11 ottobre 2022): 2107. http://dx.doi.org/10.3390/sym14102107.

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Photocatalytic technology has been considered as an efficient protocol to drive chemical reactions in a sustainable and green way. With the assistance of semiconductor-based materials, heterogeneous photocatalysis converts solar energy directly into chemical energy that can be readily stored. It has been employed in several fields including CO2 reduction, H2O splitting, and organic synthesis. Given that near-infrared (NIR) light occupies 47% of sunlight, photocatalytic systems with a NIR response are gaining more and more attention. To enhance the solar-to-chemical conversion efficiency, precise regulation of the symmetric/asymmetric nanostructures and band structures of NIR-response photocatalysts is indispensable. Under the irradiation of NIR light, the symmetric nano-morphologies (e.g., rod-like core-shell shape), asymmetric electronic structures (e.g., defect levels in band gap) and asymmetric heterojunctions (e.g., PN junctions, semiconductor-metal or semiconductor-dye composites) of designed photocatalytic systems play key roles in promoting the light absorption, the separation of electron/hole pairs, the transport of charge carriers to the surface, or the rate of surface photocatalytic reactions. This review will comprehensively analyze the four main synthesis protocols for the fabrication of NIR-response photocatalysts with improved reaction performance. The design methods involve bandgap engineering for the direct utilization of NIR photoenergy, the up-conversion of NIR light into ultraviolet/visible light, and the photothermal effect by converting NIR photons into local heat. Additionally, challenges and perspectives for the further development of heterogeneous photocatalysts with NIR response are also discussed based on their potential applications.

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3

Liu, Peng, Weijun Dai, Xianfu Shen, Xiang Shen, Yuxiang Zhao e Jian-Jun Liu. "Recent Advances in the Utilization of Chiral Covalent Organic Frameworks for Asymmetric Photocatalysis". Molecules 29, n. 21 (23 ottobre 2024): 5006. http://dx.doi.org/10.3390/molecules29215006.

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The use of light energy to drive asymmetric organic transformations to produce high-value-added organic compounds is attracting increasing interest as a sustainable strategy for solving environmental problems and addressing the energy crisis. Chiral covalent organic frameworks (COFs), as porous crystalline chiral materials, have become an important platform on which to explore new chiral photocatalytic materials due to their precise tunability, chiral structure, and function. This review highlights recent research progress on chiral COFs and their crystalline composites, evaluating their application as catalysts in asymmetric photocatalytic organic transformations in terms of their structure. Finally, the limitations and challenges of chiral COFs in asymmetric photocatalysis are discussed, with future opportunities for research being identified.

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Gao, Zhongwei, Changqing Pan, Chang-Ho Choi e Chih-Hung Chang. "Continuous-Flow Photocatalytic Microfluidic-Reactor for the Treatment of Aqueous Contaminants, Simplicity, and Complexity: A Mini-Review". Symmetry 13, n. 8 (23 luglio 2021): 1325. http://dx.doi.org/10.3390/sym13081325.

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Water pollution is a growing global issue; there are many approaches to treating wastewater, including chemical coagulation, physical adsorption, and chemical oxidation. The photocatalysis process has provided a solution for removing pollutants from wastewater, where the pair of the photoelectron and hole works through an asymmetric way to degrade the contaminants under UV irradiation. This method offers an alternative route for treating the pollutant with a lower energy cost, high efficiency, and fewer byproducts. A continuous-flow microfluidic reactor has a channel size from tens to thousands of micrometers, providing uniform irradiation and short diffusion length. It can enhance the conversion efficiency of photocatalysis due to the simple spatial symmetry inside the microreactor channel and among the individual channels. In addition, the bandgap of TiO2, ZnO, or other photocatalyst nanoparticles with symmetric crystal structure can be modified through doping or embedding. In this mini-review, a review of the reported continuous-flow photocatalytic microfluidic reactor is discussed from the perspective of both microreactor design and material engineering.

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5

Chapman, Steven J., Wesley B. Swords, Christine M. Le, Ilia A. Guzei, F. Dean Toste e Tehshik P. Yoon. "Cooperative Stereoinduction in Asymmetric Photocatalysis". Journal of the American Chemical Society 144, n. 9 (22 febbraio 2022): 4206–13. http://dx.doi.org/10.1021/jacs.2c00063.

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6

Liu, Yang, Jiangtao Li, Xinyi Ye, Xiaowei Zhao e Zhiyong Jiang. "Organocatalytic asymmetric formal arylation of benzofuran-2(3H)-ones with cooperative visible light photocatalysis". Chemical Communications 52, n. 97 (2016): 13955–58. http://dx.doi.org/10.1039/c6cc07105h.

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7

Hong, Bor-Cherng. "Enantioselective synthesis enabled by visible light photocatalysis". Organic & Biomolecular Chemistry 18, n. 23 (2020): 4298–353. http://dx.doi.org/10.1039/d0ob00759e.

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8

Wang, Chengfeng, e Zhan Lu. "Catalytic enantioselective organic transformations via visible light photocatalysis". Organic Chemistry Frontiers 2, n. 2 (2015): 179–90. http://dx.doi.org/10.1039/c4qo00306c.

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9

Jiang, Chunhui, Wei Chen, Wen-Hua Zheng e Hongfei Lu. "Advances in asymmetric visible-light photocatalysis, 2015–2019". Organic & Biomolecular Chemistry 17, n. 38 (2019): 8673–89. http://dx.doi.org/10.1039/c9ob01609k.

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Abstract (sommario):

Asymmetric visible-light photocatalysis has recently drawn considerable attention of the scientific community owing to its unique activation modes and significance for the enantioselective green synthesis.

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10

Long, Chao-Jiu, Yan-Hong He e Zhi Guan. "Asymmetric oxidative Mannich reactions promoted by photocatalysis and electrochemistry". Organic & Biomolecular Chemistry 20, n. 13 (2022): 2544–61. http://dx.doi.org/10.1039/d2ob00054g.

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11

Jagadeeswararao, Metikoti, Raquel E. Galian e Julia Pérez-Prieto. "Photocatalysis Based on Metal Halide Perovskites for Organic Chemical Transformations". Nanomaterials 14, n. 1 (28 dicembre 2023): 94. http://dx.doi.org/10.3390/nano14010094.

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Heterogeneous photocatalysts incorporating metal halide perovskites (MHPs) have garnered significant attention due to their remarkable attributes: strong visible-light absorption, tuneable band energy levels, rapid charge transfer, and defect tolerance. Additionally, the promising optical and electronic properties of MHP nanocrystals can be harnessed for photocatalytic applications through controlled crystal structure engineering, involving composition tuning via metal ion and halide ion variations, dimensional tuning, and surface chemistry modifications. Combination of perovskites with other materials can improve the photoinduced charge separation and charge transfer, building heterostructures with different band alignments, such as type-II, Z-scheme, and Schottky heterojunctions, which can fine-tune redox potentials of the perovskite for photocatalytic organic reactions. This review delves into the activation of organic molecules through charge and energy transfer mechanisms. The review further investigates the impact of crystal engineering on photocatalytic activity, spanning a diverse array of organic transformations, such as C–X bond formation (X = C, N, and O), [2 + 2] and [4 + 2] cycloadditions, substrate isomerization, and asymmetric catalysis. This study provides insights to propel the advancement of metal halide perovskite-based photocatalysts, thereby fostering innovation in organic chemical transformations.

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Huang, Xiaoqiang, e Eric Meggers. "Asymmetric Photocatalysis with Bis-cyclometalated Rhodium Complexes". Accounts of Chemical Research 52, n. 3 (6 marzo 2019): 833–47. http://dx.doi.org/10.1021/acs.accounts.9b00028.

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Rigotti, Thomas, e José Alemán. "Visible light photocatalysis – from racemic to asymmetric activation strategies". Chemical Communications 56, n. 76 (2020): 11169–90. http://dx.doi.org/10.1039/d0cc03738a.

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14

Garrido-Castro, Alberto F., M. Carmen Maestro e José Alemán. "α-Functionalization of Imines via Visible Light Photoredox Catalysis". Catalysts 10, n. 5 (19 maggio 2020): 562. http://dx.doi.org/10.3390/catal10050562.

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The innate electrophilicity of imine building blocks has been exploited in organic synthetic chemistry for decades. Inspired by the resurgence in photocatalysis, imine reactivity has now been redesigned through the generation of unconventional and versatile radical intermediates under mild reaction conditions. While novel photocatalytic approaches have broadened the range and applicability of conventional radical additions to imine acceptors, the possibility to use these imines as latent nucleophiles via single-electron reduction has also been uncovered. Thus, multiple research programs have converged on this issue, delivering creative and practical strategies to achieve racemic and asymmetric α-functionalizations of imines under visible light photoredox catalysis.

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15

Yu, Cai-Xia, Yan-Ping Gao, Xiao-Qing Cui, Meng-Jiao Guo e Lei-Lei Liu. "The crystal structure and photocatalytic properties of a three-dimensional cadmium(II) metal–organic framework: poly[bis(μ3-benzene-1,2-dicarboxylato)[μ2-1,4-bis(pyridin-3-ylmethoxy)benzene]dicadmium(II)]". Acta Crystallographica Section C Structural Chemistry 72, n. 3 (6 febbraio 2016): 174–78. http://dx.doi.org/10.1107/s2053229616001522.

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Photocatalysis is a green technology for the treatment of all kinds of contaminants and has advantages over other treatment methods. Recently, much effort has been devoted to developing new photocatalytic materials based on metal–organic frameworks for use in the degradation of many kinds of organic contaminants. With the aim of searching for more effective photocatalysts, the title three-dimensional coordination polymer, [Cd2(C8H4O4)2(C18H16N2O2)]n, was prepared. The asymmetric unit contains one CdIIcation, one benzene-1,2-dicarboxylate anion (denotedL2−) and half of a centrosymmetric 1,4-bis(pyridin-3-ylmethoxy)benzene ligand (denoted bpmb). Each CdIIcentre is five-coordinated by four carboxylate O atoms from twoL2−ligands and by one N atom from a bpmb ligand, forming a disordered pentagonal pyramidal coordination geometry. The CdIIcentres are interlinked byL2−ligands to form a one-dimensional [Cd2L2]nchain. Adjacent chains are further connected by bpmb linkers, giving rise to a two-dimensional network, and these networks are pillared by bpmb to afford a three-dimensional framework with a 33.42.63.71.81topology. Each grid in the framework has large channels which are filled mainly by the two other equivalent frameworks to form a threefold interpenetrating net. The compound exhibits relatively good photocatalytic activity towards the degradation of methylene blue in aqueous solution under UV irradiation.

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16

Zhou, Kexu, Ying Yu, Yu-Mei Lin, Yanjun Li e Lei Gong. "Copper-catalyzed aerobic asymmetric cross-dehydrogenative coupling of C(sp3)–H bonds driven by visible light". Green Chemistry 22, n. 14 (2020): 4597–603. http://dx.doi.org/10.1039/d0gc00262c.

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Litman, Zachary C., Yajie Wang, Huimin Zhao e John F. Hartwig. "Cooperative asymmetric reactions combining photocatalysis and enzymatic catalysis". Nature 560, n. 7718 (agosto 2018): 355–59. http://dx.doi.org/10.1038/s41586-018-0413-7.

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18

Casado-Sánchez, Antonio, Pablo Domingo-Legarda, Silvia Cabrera e José Alemán. "Visible light photocatalytic asymmetric synthesis of pyrrolo[1,2-a]indoles via intermolecular [3+2] cycloaddition". Chemical Communications 55, n. 75 (2019): 11303–6. http://dx.doi.org/10.1039/c9cc05838a.

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The asymmetric synthesis of pyrrolo[1,2-a]indoles is developed through a [3+2] cycloaddition between silyl-indole derivatives and α,β-unsaturated N-acyl oxazolidinones by merging photocatalysis and Lewis acid catalysis.

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19

Li, Chunzhi, Yinhua Ma, Haoran Liu, Lin Tao, Yiqi Ren, Xuelian Chen, He Li e Qihua Yang. "Asymmetric photocatalysis over robust covalent organic frameworks with tetrahydroquinoline linkage". Chinese Journal of Catalysis 41, n. 8 (agosto 2020): 1288–97. http://dx.doi.org/10.1016/s1872-2067(20)63572-0.

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20

Wang, Yuehui, Jun Huang, Ye Zhang, Shiwen Zhang, Lili Li e Xuan Pang. "The Design of PAN-Based Janus Membrane with Adjustable Asymmetric Wettability in Wastewater Purification". Materials 17, n. 2 (14 gennaio 2024): 417. http://dx.doi.org/10.3390/ma17020417.

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In this paper, an environmentally friendly polyacrylonitrile-based (PAN-based) composite membrane with a Janus structure for wastewater treatment was successfully fabricated. To achieve the optimum adsorption of PAN-based Janus composite membrane, the asymmetric wettability was regulated through electrospinning, resulting in TiO2 modifying PAN as the hydrophilic substrate layer, and PCL gaining a different thickness as the hydrophobic layer. The prepared Janus composite membrane (PAN/TiO2-PCL20) showed excellent oil/water separation performance for diverse surfactant-stabilized oil-in-water emulsions. For n-hexane-in-water emulsion, the permeate flux and separation efficiency reached 1344 L m−2 h−1 and 99.52%, respectively. Even after 20 cycles of separation, it still had outstanding reusability and the separation efficiency remained above 99.15%. Meanwhile, the PAN/TiO2-PCL20 also exhibited an excellent photocatalytic activity, and the removal rate for RhB reached 93.2%. In addition, the research revealed that PAN/TiO2-PCL20 possessed good mechanical property and unidirectional water transfer capability. All results indicated that PAN/TiO2-PCL20 with photocatalysis and oil/water separation performance could be used for practical complex wastewater purification.

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21

Baburaj, Sruthy, Lakshmy Kannadi Valloli, Jayachandran Parthiban, Dipti Garg e Jayaraman Sivaguru. "Manipulating excited state reactivity and selectivity through hydrogen bonding – from solid state reactivity to Brønsted acid photocatalysis". Chemical Communications 58, n. 12 (2022): 1871–80. http://dx.doi.org/10.1039/d1cc06128c.

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This feature article highlights the role of different hydrogen bonding templates in enhancing and controlling excited state processes with an eye towards the development of Brønsted acid mediated organo-photocatalysts for asymmetric photochemical transformations.

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22

Dai, Yujie, Chen Lu, Lin Liang, Naixing Feng e Jingang Wang. "Visible Light Electromagnetic Interaction of PM567 Chiral Dye for Asymmetric Photocatalysis, a First-Principles Investigation". Catalysts 10, n. 8 (4 agosto 2020): 882. http://dx.doi.org/10.3390/catal10080882.

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In asymmetric photocatalytic reactions, it is necessary to study the mechanism of the asymmetric electromagnetic interaction between molecules and light. In this work, we theoretically studied the electromagnetic interactions between the light-induced charge transfer reaction and the chiral reaction of PM567 dye. We found that the chiral responses of molecules in different wavelength ranges were partially due to pyrromethene and binaphthalene. Therefore, the catalytic sites with different chirality also corresponds to the two-part groups. Through quantitative analysis, we found the entire analysis process to be complete and self-consistent.

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23

García-Fernández, Pedro D., Juan M. Coto-Cid e Gonzalo de Gonzalo. "Green Oxidative Catalytic Processes for the Preparation of APIs and Precursors". Catalysts 13, n. 3 (22 marzo 2023): 638. http://dx.doi.org/10.3390/catal13030638.

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Asymmetric oxidation processes have constituted a valuable tool for the synthesis of active pharmaceutical ingredients (APIs), especially for the preparation of optically active sulfoxides, compounds with interesting biological properties. Classical approaches for these oxidative procedures usually require the application of non-sustainable conditions that employ hazardous reagents and solvents. In the last decades, chemists have tried to combine the preparation of valuable compounds of high yields and selectivities with the development of more sustainable protocols. To achieve this objective, greener solvents, reagents, and catalysts are employed, together with the use of novel chemical techniques such as flow catalysis or photocatalysis. The last efforts in the development of greener approaches for the preparation of APIs and their intermediates using oxidative procedure will be reviewed herein. Most of these approaches refer to biocatalytic methods, in which mild reaction conditions and reagents are employed, but other novel techniques such as photocatalysis will be described.

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24

Yang, Weijie, Xiao-Li Wang, Ningning Kong, Chengdong Liu, Peipei Sun, Zhiqiang Wang, Yayun Ding, Haiping Lin, Dongsheng Li e Tao Wu. "Minimized external electric field on asymmetric monolayer maximizes charge separation for photocatalysis". Applied Catalysis B: Environmental 295 (ottobre 2021): 120266. http://dx.doi.org/10.1016/j.apcatb.2021.120266.

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Garrido-Castro, Alberto F., M. Carmen Maestro e José Alemán. "Asymmetric induction in photocatalysis – Discovering a new side to light-driven chemistry". Tetrahedron Letters 59, n. 14 (aprile 2018): 1286–94. http://dx.doi.org/10.1016/j.tetlet.2018.02.040.

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Zhang, Chenhao, Shuming Chen, Chen‐Xi Ye, Klaus Harms, Lilu Zhang, K. N. Houk e Eric Meggers. "Asymmetric Photocatalysis by Intramolecular Hydrogen‐Atom Transfer in Photoexcited Catalyst–Substrate Complex". Angewandte Chemie International Edition 58, n. 41 (30 agosto 2019): 14462–66. http://dx.doi.org/10.1002/anie.201905647.

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Zhang, Chenhao, Shuming Chen, Chen‐Xi Ye, Klaus Harms, Lilu Zhang, K. N. Houk e Eric Meggers. "Asymmetric Photocatalysis by Intramolecular Hydrogen‐Atom Transfer in Photoexcited Catalyst–Substrate Complex". Angewandte Chemie 131, n. 41 (30 agosto 2019): 14604–8. http://dx.doi.org/10.1002/ange.201905647.

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Jiang, Yingyan, Hua Su, Wei Wei, Yongjie Wang, Hong-Yuan Chen e Wei Wang. "Tracking the rotation of single CdS nanorods during photocatalysis with surface plasmon resonance microscopy". Proceedings of the National Academy of Sciences 116, n. 14 (14 marzo 2019): 6630–34. http://dx.doi.org/10.1073/pnas.1820114116.

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While rotational dynamics of anisotropic nanoobjects has often been limited in plasmonic and fluorescent nanomaterials, here we demonstrate the capability of a surface plasmon resonance microscopy (SPRM) to determine the orientation of all kinds of anisotropic nanomaterials. By taking CdS nanorods as an example, it was found that two-dimensional Fourier transform of the asymmetrical wave-like SPRM image resulted in a peak in its angular spectrum inkspace. Consistency between the peak angle and the geometrical orientation of the nanorod was validated by both in situ scanning electron microscope characterizations and theoretical calculations. Real-time monitoring of the rotational dynamics of single CdS nanorods further revealed the accelerated rotation under appropriate reaction conditions for photocatalyzed hydrogen generation. The driving force was attributed to the asymmetric production of hydrogen molecules as a result of inhomogeneous distribution of reactive sites within the nanorod. The present work not only builds the experimental and theoretical connections between the orientation of anisotropic nanomaterials and its SPRM images; the general suitability of SPRM also sheds light on broad types of nonfluorescent and nonplasmonic anisotropic nanoobjects from semiconductors to bacteria and viruses.

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Xia, Rong, Yang Li, Song You, Chunhua Lu, Wenbin Xu e Yaru Ni. "Asymmetric Plasmonic Moth-Eye Nanoarrays with Side Opening for Broadband Incident-Angle-Insensitive Antireflection and Absorption". Materials 16, n. 17 (31 agosto 2023): 5988. http://dx.doi.org/10.3390/ma16175988.

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Plasmonic absorbers with broadband angle-insensitive antireflection have attracted intense interests because of its wide applications in optical devices. Hybrid surfaces with multiple different sub-wavelength array units can provide broadened antireflection, while many of these antireflective surfaces only work for specific angles and require high complexity of nanofabrication. Here, a plasmonic asymmetric nanostructure composed of the moth-eye dielectric nanoarray partially modified with the top Ag nanoshell providing a side opening for broadband incident-angle-insensitive antireflection and absorption, is rationally designed by nanoimprinting lithography and oblique angle deposition. This study illustrates that the plasmonic asymmetric nanostructure not only excites strong plasmonic resonance, but also induces more light entry into the dielectric nanocavity and then enhances the internal scattering, leading to optimized light localization. Hence, the asymmetric nanostructure can effectively enhance light confinement at different incident angles and exhibit better antireflection and the corresponding absorption performance than that of symmetric nanostructure over the visible wavelengths, especially suppressing at least 16.4% lower reflectance in the range of 645–800 nm at normal incidence.Moreover, the reflectance variance of asymmetric nanostructure with the incident angle changing from 5° to 60° is much smaller than that of symmetric nanostructure, making our approach relevant for various applications in photocatalysis, photothermal conversion, and so on.

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Cheng, Yuan-Zheng, Xiao Zhang e Shu-Li You. "Visible-light-mediated photocatalysis as a new tool for catalytic asymmetric dearomatization (CADA) reactions". Science Bulletin 63, n. 13 (luglio 2018): 809–11. http://dx.doi.org/10.1016/j.scib.2018.06.006.

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Hu, Ziying, Qianqian Zhang, Jun Gao, Zhaoyue Liu, Jin Zhai e Lei Jiang. "Photocatalysis-Triggered Ion Rectification in Artificial Nanochannels Based on Chemically Modified Asymmetric TiO2 Nanotubes". Langmuir 29, n. 15 (2 aprile 2013): 4806–12. http://dx.doi.org/10.1021/la400624p.

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Hoffmann, Norbert, Samuel Bertrand, Siniša Marinković e Jens Pesch. "Efficient radical addition of tertiary amines to alkenes using photochemical electron transfer". Pure and Applied Chemistry 78, n. 12 (1 gennaio 2006): 2227–46. http://dx.doi.org/10.1351/pac200678122227.

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An efficient photoinduced radical addition of tertiary amine, mainly cyclic derivatives, to electron-deficient alkenes was developed. The reaction was applied to the asymmetric synthesis of the pyrrolizidine alkaloids laburnine and isoretronecanol. The method was then optimized for the addition of a larger variety of tertiary amines, in particular acyclic ones. Radical tandem addition cyclization reactions with unsaturated tertiary amines have also been investigated. A detailed mechanistic study using isotopic labeling enabled the optimization of a corresponding reaction with N,N-dialkylaniline derivatives. The origin of the high reaction stereoselectivity achieved with menthyloxyfuranone was elucidated. The radical addition of tertiary amines was also performed with heterogeneous photocatalysis using inorganic semiconductors as sensitizers.

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Hua, Ting-Bi, Qing-Qing Yang e You-Quan Zou. "Recent Advances in Enantioselective Photochemical Reactions of Stabilized Diazo Compounds". Molecules 24, n. 17 (2 settembre 2019): 3191. http://dx.doi.org/10.3390/molecules24173191.

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Diazo compounds have proven to be a useful class of carbenes or metal carbenoids sources under thermal, photochemical, or metal-catalyzed conditions, which can subsequently undergo a wide range of synthetically important transformations. Recently, asymmetric photocatalysis has provoked increasing research interests, and great advances have been made in this discipline towards the synthesis of optically enriched compounds. In this context, the past two decades have been the most productive period in the developments of enantioselective photochemical reactions of diazo compounds due to a better understanding of the reactivities of diazo compounds and the emergence of new catalytic modes, as well as easier access to and treatment of stabilized diazo compounds. This review highlights these impressive achievements according to the reaction type, and the general mechanisms and stereochemical inductions are briefly discussed as well.

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Uraguchi, Daisuke, Yuto Kimura, Fumito Ueoka e Takashi Ooi. "Urea as a Redox-Active Directing Group under Asymmetric Photocatalysis of Iridium-Chiral Borate Ion Pairs". Journal of the American Chemical Society 142, n. 46 (5 novembre 2020): 19462–67. http://dx.doi.org/10.1021/jacs.0c09468.

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Poudel, Milan Babu, Changho Yu e Han Joo Kim. "Synthesis of Conducting Bifunctional Polyaniline@Mn-TiO2 Nanocomposites for Supercapacitor Electrode and Visible Light Driven Photocatalysis". Catalysts 10, n. 5 (14 maggio 2020): 546. http://dx.doi.org/10.3390/catal10050546.

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We report a polyaniline-wrapped, manganese-doped titanium oxide (PANi/Mn-TiO2) nanoparticle composite for supercapacitor electrode and photocatalytic degradation. The PANi/Mn-TiO2 nanoparticles were synthesized using a solvothermal process, followed by oxidative polymerization of aniline. The structural properties of studied materials were confirmed by XRD, FTIR, HRTEM, FESEM, and UV visible spectroscopy. The as-prepared PANi/Mn-TiO2 nanoparticles revealed admirable electrochemical performance with a specific capacitance of 635.87 F g−1 at a current density of 1 A g−1 with a notable life cycle retention of 91% after 5000 charge/discharge cycles. Furthermore, the asymmetric cell with PANi/Mn-TiO2 as a positive electrode exhibited energy density of 18.66 W h kg−1 with excellent stability. Moreover, the PANi/Mn-TiO2 had promising photocatalytic activity for methylene blue degradation. The improved performance of PANi/Mn-TiO2 nanoparticles is attributed to the well-built synergetic effect of components that lead to significant reduction of band gap energy and charge transfer resistance, as revealed by UV visible spectroscopy and electrochemical impedance spectroscopy.

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Chen, Xiao-Li, Ying Zhou, Hua-Li Cui, Hua Yang, Yi-Xia Ren, Ji-Jiang Wang e Long Tang. "Two novel d10 metal coordination polymers based on an asymmetric polycarboxylate ligand: Synthesis, crystal structure, photoluminescence and photocatalysis". Journal of Molecular Structure 1175 (gennaio 2019): 593–600. http://dx.doi.org/10.1016/j.molstruc.2018.08.036.

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Kuang, Yulong, Kai Wang, Xiangcheng Shi, Xiaoqiang Huang, Eric Meggers e Jie Wu. "Asymmetric Synthesis of 1,4‐Dicarbonyl Compounds from Aldehydes by Hydrogen Atom Transfer Photocatalysis and Chiral Lewis Acid Catalysis". Angewandte Chemie International Edition 58, n. 47 (18 novembre 2019): 16859–63. http://dx.doi.org/10.1002/anie.201910414.

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38

Kuang, Yulong, Kai Wang, Xiangcheng Shi, Xiaoqiang Huang, Eric Meggers e Jie Wu. "Asymmetric Synthesis of 1,4‐Dicarbonyl Compounds from Aldehydes by Hydrogen Atom Transfer Photocatalysis and Chiral Lewis Acid Catalysis". Angewandte Chemie 131, n. 47 (18 novembre 2019): 17015–19. http://dx.doi.org/10.1002/ange.201910414.

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39

Guo, Jing, Yan‐Zhong Fan, Yu‐Lin Lu, Shao‐Ping Zheng e Cheng‐Yong Su. "Visible‐Light Photocatalysis of Asymmetric [2+2] Cycloaddition in Cage‐Confined Nanospace Merging Chirality with Triplet‐State Photosensitization". Angewandte Chemie 132, n. 22 (20 marzo 2020): 8739–47. http://dx.doi.org/10.1002/ange.201916722.

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40

Guo, Jing, Yan‐Zhong Fan, Yu‐Lin Lu, Shao‐Ping Zheng e Cheng‐Yong Su. "Visible‐Light Photocatalysis of Asymmetric [2+2] Cycloaddition in Cage‐Confined Nanospace Merging Chirality with Triplet‐State Photosensitization". Angewandte Chemie International Edition 59, n. 22 (20 marzo 2020): 8661–69. http://dx.doi.org/10.1002/anie.201916722.

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41

Kang, Haeun, Dong Il Won e Dong Ha Kim. "Fabrication of Chiral Plasmonic Photocatalyst By Circularly Polarized Light and Enantioselective Hydrogen Generation Activity". ECS Meeting Abstracts MA2023-02, n. 36 (22 dicembre 2023): 3386. http://dx.doi.org/10.1149/ma2023-02363386mtgabs.

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Abstract (sommario):

Introducing chirality in nanostructures has been explored actively in various field, such as sensing, optoelectronics and catalysts, due to its unique chiroptical properties. Especially in photochemistry, considering the synergistic interaction between chiral plasmonics and polarized light, they can be utilized to improve efficiency and selectivity of catalytic reaction. In this work, we synthesized chiral plasmonic photocatalysts, (R)-,(L)- Au/C3N4, through photoreduction of gold precursor on C3N4 substrate under the irradiation of circularly polarized light (CPL) as a means to induce chirality. Then, we demonstrated that the efficiency of hydrogen generation can be increased by matching the chirality of the CPL with the photocatalyst, which was 2-fold enhanced than chiral mismatching conditions. This can be explained by the asymmetric hot carrier formation of chiral plasmonic structures under CPL excitation. Also, the reactivity of water molecule with photocatalyst surface was confirmed through in-situ FT-IR, showing the enhanced interaction under chiral matching conditions. This study could pave the way for advancing chiral light-matter interactions and explore the application of novel device, particularly toward chiral-induced photocatalytic performance.

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42

Zeevi, Gilad, Joanna Dehnel, Adam K. Budniak, Yana Milyutin, Guy Ankonina, Hossam Haick, Efrat Lifshitz e Yuval E. Yaish. "Dynamics of light-induced charge transfer between carbon nanotube and CdSe/CdS core/shell nanocrystals". Nano Futures 6, n. 1 (20 gennaio 2022): 015001. http://dx.doi.org/10.1088/2399-1984/ac3ccc.

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Abstract The integration of semiconducting colloidal nanocrystals (NCs) with carbon nanotubes (CNTs) in a single device presents a unique platform that combines optical flexibility with high charge carrying capability. These qualities are desirable in many applications such as photovoltaic cells, photocatalysis, and light sensors. Here, we present hybrid devices that incorporate various CdSe/CdS core/shell NCs, such as seeded quantum dots and asymmetric seeded nanorods (a-sNRs), with a single-wall CNT in a field-effect transistor geometry. We used electrical measurements to probe a light-induced charge transfer (LICT) between the CdSe/CdS NCs and the CNT. We investigate the effect of gate voltage on the LICT magnitude and temporal characteristics. Surprisingly, the measured photo-response depends on the gate voltage, and we observe both electrons and holes transfer from the a-sNRs to the CNT. Furthermore, a comparison between LICT measurements on different devices with different CNTs and NC types reveals that the charge transfer time is directly proportional to the shell-thickness around the CdSe core and inversely correlated with the NCs size. The recovery of the charge trapped inside the CdSe/CdS NCs is characterized by two distinct fast and slow relaxation times, which depend on the NCs size and CNT type. Although, the charge relaxation time is similar between the symmetric QDs and the asymmetric sNRs, the overall percentage of the remaining charge in the QDs is significantly larger than in the sNRs. Understanding both gate voltage and NCs size effect on the LICT processes can optimize the performance of optoelectronic devices.

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Zheng, Jian, Wesley B. Swords, Hoimin Jung, Kazimer L. Skubi, Jesse B. Kidd, Gerald J. Meyer, Mu-Hyun Baik e Tehshik P. Yoon. "Enantioselective Intermolecular Excited-State Photoreactions Using a Chiral Ir Triplet Sensitizer: Separating Association from Energy Transfer in Asymmetric Photocatalysis". Journal of the American Chemical Society 141, n. 34 (22 luglio 2019): 13625–34. http://dx.doi.org/10.1021/jacs.9b06244.

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44

Ding, Xuan, Chun-Lin Dong, Zhi Guan e Yan-Hong He. "Concurrent Asymmetric Reactions Combining Photocatalysis and Enzyme Catalysis: Direct Enantioselective Synthesis of 2,2-Disubstituted Indol-3-ones from 2-Arylindoles". Angewandte Chemie 131, n. 1 (3 dicembre 2018): 124–30. http://dx.doi.org/10.1002/ange.201811085.

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45

Ding, Xuan, Chun-Lin Dong, Zhi Guan e Yan-Hong He. "Concurrent Asymmetric Reactions Combining Photocatalysis and Enzyme Catalysis: Direct Enantioselective Synthesis of 2,2-Disubstituted Indol-3-ones from 2-Arylindoles". Angewandte Chemie International Edition 58, n. 1 (3 dicembre 2018): 118–24. http://dx.doi.org/10.1002/anie.201811085.

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46

Konstantinova, Elizaveta, Vladimir Zaitsev, Artem Marikutsa e Alexander Ilin. "Comparative Study: Catalytic Activity and Rhodamine Dye Luminescence at the Surface of TiO2-Based Nanoheterostructures". Symmetry 13, n. 9 (21 settembre 2021): 1758. http://dx.doi.org/10.3390/sym13091758.

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Abstract (sommario):

Nanoheterostructures based on titanium, molybdenum, tungsten, and vanadium nanooxides with symmetric crystal structures, morphologies and high photocatalytic activity in under illumination by visible light, have been synthesized and studied. Microscopy, optical spectroscopy, and electron-spin resonance techniques were used. The asymmetric separation of photo-generated holes and electrons between different nanooxides in their nanoheterostructures suppresses their recombination. Using the method developed by the authors and based on ESR spectroscopy, the energy levels of the active centers inside the band gaps of the studied samples were found. We have shown, for the first time, that under illumination of nanoheterostructures under asymmetric conditions with adsorbed rhodamine dye at the dye-absorption wavelength (500 nm), photocatalytic reactions are mainly determined by light absorption by the nanostructures themselves, and not by energy transfer from the dye. This important result shows that high photocatalytic activity of materials with symmetric crystal structures is the primary criterion for creating energy-efficient photocatalysts. The results will be useful for the development of energy-efficient catalytic devices based on various combinations of metal nanooxides.

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47

Dong, Chun-Lin, Xuan Ding, Lan-Qian Huang, Yan-Hong He e Zhi Guan. "Merging Visible Light Photocatalysis and l-/d-Proline Catalysis: Direct Asymmetric Oxidative Dearomatization of 2-Arylindoles To Access C2-Quaternary Indolin-3-ones". Organic Letters 22, n. 3 (24 gennaio 2020): 1076–80. http://dx.doi.org/10.1021/acs.orglett.9b04613.

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48

Barrera, Luisa, Daniel V. Esposito, Shane Ardo e Rohini Bala Chandran. "Revealing the Role of Redox Reaction Selectivity and Mass Transfer in Current–Voltage Predictions for Ensembles of Photocatalysts". ECS Meeting Abstracts MA2024-01, n. 35 (9 agosto 2024): 1993. http://dx.doi.org/10.1149/ma2024-01351993mtgabs.

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Abstract (sommario):

Photocatalysts are conceptually simple reaction units where nanoscale semiconductors integrated with catalysts drive a pair of redox reactions on illumination. However, the proximity of reaction sites performing cathodic and anodic reactions poses dire challenges to realize large light-to-fuel conversion efficiencies. In this study, a powerful, yet straightforward, equivalent-circuit detail-balance modeling framework is developed and applied to evaluate the performance of photocatalytic systems featuring multiple light absorbers. Specifically, low bandgap iridium-doped strontium titanate is modeled a Z-scheme photocatalyst to effect desired hydrogen evolution and iron-based redox shuttle oxidation reactions. Our model has unique capabilities to simulate competing redox reactions and address mass-transfer limitations. In a significant departure from state-of-the-art circuit models, our study develops tools to perform load-line analyses by incorporating a net electrochemical load curve that includes both desired and competing redox reactions. Consequently, reaction selectivity is predicted from equivalent circuit models for photocatalytic and photoelectrochemical systems. Our investigation into ensembles comprised of multiple, semi-transparent light absorbers reveals their potential to outperform a single, optically thick light absorber, particularly when operated under mass-transfer-limited conditions. However, this outcome hinges on minimizing mass-transfer rates of select redox species to prevent undesired reactions of hydrogen oxidation and/or redox shuttle reduction. Our findings demonstrate that reaction selectivity can be achieved by tuning asymmetry in redox species mass-transfer even with perfectly symmetric electrocatalytic charge-transfer coefficients. The influences of various kinetic, mass-transfer, and thermodynamic parameters are explored to offer crucial insights to inform the next-generation of photocatalysts, selective coatings, and reactor designs.

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Ren, Hao, Yi-Ming Li, Wen-Jing Li, Qing-Chao Zhai e Lin Cheng. "Lead-halide Perovskites Quantum Dots Embedded in Mesoporous Silica as Heterogeneous Photocatalysts Combined with Organocatalysts for Asymmetric Catalysis". Green Chemistry, 2024. http://dx.doi.org/10.1039/d3gc05059a.

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Asymmetric photocatalysis consists of the synergistic effect of photocatalysis and organocatalysis, in which the photoelectrons in photocatalysts catalyze substrates to produce free radical intermediates, and chiral substances can control the...

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Jia, Guangri, Yingchuan Zhang, Jimmy C. Yu e Zhengxiao Guo. "Asymmetric Atomic Dual‐Sites for Photocatalytic CO₂ Reduction". Advanced Materials, 23 luglio 2024. http://dx.doi.org/10.1002/adma.202403153.

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Abstract (sommario):

AbstractAtomically dispersed active sites in a photocatalyst offer unique advantages such as locally tuned electronic structures, quantum size effects, and maximum utilization of atomic species. Among these, asymmetric atomic dual‐sites are of particular interest because their asymmetric charge distribution generates a local built‐in electric potential to enhance charge separation and transfer. Moreover, the dual sites provide flexibility for tuning complex multielectron and multireaction pathways, such as CO2 reduction reactions. The coordination of dual sites opens new possibilities for engineering the structure–activity–selectivity relationship. This comprehensive overview discusses efficient and sustainable photocatalysis processes in photocatalytic CO2 reduction, focusing on strategic active‐site design and future challenges. It serves as a timely reference for the design and development of photocatalytic conversion processes, specifically exploring the utilization of asymmetric atomic dual‐sites for complex photocatalytic conversion pathways, here exemplified by the conversion of CO2 into valuable chemicals.

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