51
|
Single-molecule and -particle probing crystal edge/corner as highly efficient photocatalytic sites on a single TiO 2 particle. Proc Natl Acad Sci U S A 2019; 116:18827-18833. [PMID: 31484775 DOI: 10.1073/pnas.1907122116] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The exposed active sites of semiconductor catalysts are essential to the photocatalytic energy conversion efficiency. However, it is difficult to directly observe such active sites and understand the photogenerated electron/hole pairs' dynamics on a single catalyst particle. Here, we applied a quasi-total internal reflection fluorescence microscopy and laser-scanning confocal microscopy to identify the photocatalytic active sites at a single-molecule level and visualized the photogenerated hole-electron pair dynamics on a single TiO2 particle, the most widely used photocatalyst. The experimental results and density functional theory calculations reveal that holes and electrons tend to reach and react at the same surface sites, i.e., crystal edge/corner, within a single anatase TiO2 particle owing to the highly exposed (001) and (101) facets. The observation provides solid proof for the existence of the surface junction "edge or corner" on single TiO2 particles. These findings also offer insights into the nature of the photocatalytic active sites and imply an activity-based strategy for rationally engineering catalysts for improved photocatalysis, which can be also applied for other catalytic materials.
Collapse
|
52
|
Filez M, Redekop EA, Dendooven J, Ramachandran RK, Solano E, Olsbye U, Weckhuysen BM, Galvita VV, Poelman H, Detavernier C, Marin GB. Formation and Functioning of Bimetallic Nanocatalysts: The Power of X‐ray Probes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201902859] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Matthias Filez
- Inorganic Chemistry and Catalysis groupUtrecht University Universiteitsweg 99 3584CG Utrecht The Netherlands
| | - Evgeniy A. Redekop
- Centre for Materials Science and Nanotechnology (SMN)Department of ChemistryUniversity of Oslo P.O box 1126 Blindern C0318 Oslo Norway
| | - Jolien Dendooven
- Conformal Coatings of Nanomaterials groupGhent University Krijgslaan 281/S1 9000 Ghent Belgium
| | - Ranjith K. Ramachandran
- Conformal Coatings of Nanomaterials groupGhent University Krijgslaan 281/S1 9000 Ghent Belgium
| | - Eduardo Solano
- Conformal Coatings of Nanomaterials groupGhent University Krijgslaan 281/S1 9000 Ghent Belgium
- NCD-SWEET beamlineALBA synchrotron light source Carrer de la Llum 2–26 08290, Cerdanyola del Vallès Barcelona Spain
| | - Unni Olsbye
- Centre for Materials Science and Nanotechnology (SMN)Department of ChemistryUniversity of Oslo P.O box 1126 Blindern C0318 Oslo Norway
| | - Bert M. Weckhuysen
- Inorganic Chemistry and Catalysis groupUtrecht University Universiteitsweg 99 3584CG Utrecht The Netherlands
| | - Vladimir V. Galvita
- Laboratory for Chemical TechnologyGhent University Technologiepark 125 9052 Ghent Belgium
| | - Hilde Poelman
- Laboratory for Chemical TechnologyGhent University Technologiepark 125 9052 Ghent Belgium
| | - Christophe Detavernier
- Conformal Coatings of Nanomaterials groupGhent University Krijgslaan 281/S1 9000 Ghent Belgium
| | - Guy B. Marin
- Laboratory for Chemical TechnologyGhent University Technologiepark 125 9052 Ghent Belgium
| |
Collapse
|
53
|
Vicente JR, Rafiei Miandashti A, Sy Piecco KWE, Pyle JR, Kordesch ME, Chen J. Single-Particle Organolead Halide Perovskite Photoluminescence as a Probe for Surface Reaction Kinetics. ACS APPLIED MATERIALS & INTERFACES 2019; 11:18034-18043. [PMID: 31007015 DOI: 10.1021/acsami.9b03822] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Photoluminescence (PL) of organolead halide perovskites (OHPs) is sensitive to OHPs' surface conditions and is an effective way to report surface states. Literature has reported that at the ensemble level, the PL of photoexcited OHP nanorods declines under an inert nitrogen (N2) atmosphere and recovers under subsequent exposure to oxygen (O2). At the single-particle level, we observed that OHP nanorods photoblink at rates dependent on both the excitation intensity and the O2 concentration. Combining the two sets of information with the charge-trapping/detrapping mechanism, we are able to quantitatively evaluate the interaction between a single surface defect and a single O2 molecule using a new kinetic model. The model predicts that the photodarkening of OHP nanorods in the N2 atmosphere has a different mechanism than conventional PL quenching, which we call photo-knockout. This model provides fundamental insights into the interactions of molecular O2 with OHP materials and helps design a suitable OHP interface for a variety of applications in photovoltaics and optoelectronics.
Collapse
Affiliation(s)
- Juvinch R Vicente
- Department of Chemistry , University of the Philippines Visayas , Miagao, Iloilo 5023 , Philippines
| | | | - Kurt Waldo E Sy Piecco
- Department of Chemistry , University of the Philippines Visayas , Miagao, Iloilo 5023 , Philippines
| | | | | | | |
Collapse
|
54
|
Qiu K, Fato TP, Yuan B, Long YT. Toward Precision Measurement and Manipulation of Single-Molecule Reactions by a Confined Space. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1805426. [PMID: 30924293 DOI: 10.1002/smll.201805426] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 02/28/2019] [Indexed: 06/09/2023]
Abstract
All chemical reactions can be divided into a series of single molecule reactions (SMRs), the elementary steps that involve only isomerization of, dissociation from, and addition to an individual molecule. Analyzing SMRs is of paramount importance to identify the intrinsic molecular mechanism of a complex chemical reaction, which is otherwise implausible to reveal in an ensemble fashion, owing to the significant static and dynamic heterogeneity of real-world chemical systems. The single-molecule measurement and manipulation methods developed recently are playing an increasingly irreplaceable role to detect and recognize short-lived intermediates, visualize their transient existence, and determinate the kinetics and dynamics of single bond breaking and formation. Notably, none of the above SMRs characterizations can be realized without the aid of a confined space. Therefore, this Review aims to highlight the recent progress in the development of confined space enabled single-molecule sensing, imaging, and tuning methods to study chemical reactions. Future prospects of SMRs research are also included, including a push toward the physical limit on transduction of information to signals and vice versa, transmission and recording of signals, computational modeling and simulation, and rational design of a confined space for precise SMRs.
Collapse
Affiliation(s)
- Kaipei Qiu
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Tano Patrice Fato
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Bo Yuan
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Yi-Tao Long
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| |
Collapse
|
55
|
Easter QT, Garcia A, Blum SA. Single-Polymer–Particle Growth Kinetics with Molecular Catalyst Speciation and Single-Turnover Imaging. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00095] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Quinn T. Easter
- Department of Chemistry, University of California, Irvine, Irvine, California 92697−2925, United States
| | - Antonio Garcia
- Department of Chemistry, University of California, Irvine, Irvine, California 92697−2925, United States
| | - Suzanne A. Blum
- Department of Chemistry, University of California, Irvine, Irvine, California 92697−2925, United States
| |
Collapse
|
56
|
Jiang H, Jin S, Wang C, Ma R, Song Y, Gao M, Liu X, Shen A, Cheng GJ, Deng H. Nanoscale Laser Metallurgy and Patterning in Air Using MOFs. J Am Chem Soc 2019; 141:5481-5489. [DOI: 10.1021/jacs.9b00355] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
57
|
Huang Y, Ren J, Qu X. Nanozymes: Classification, Catalytic Mechanisms, Activity Regulation, and Applications. Chem Rev 2019; 119:4357-4412. [PMID: 30801188 DOI: 10.1021/acs.chemrev.8b00672] [Citation(s) in RCA: 1498] [Impact Index Per Article: 299.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Because of the high catalytic activities and substrate specificity, natural enzymes have been widely used in industrial, medical, and biological fields, etc. Although promising, they often suffer from intrinsic shortcomings such as high cost, low operational stability, and difficulties of recycling. To overcome these shortcomings, researchers have been devoted to the exploration of artificial enzyme mimics for a long time. Since the discovery of ferromagnetic nanoparticles with intrinsic horseradish peroxidase-like activity in 2007, a large amount of studies on nanozymes have been constantly emerging in the next decade. Nanozymes are one kind of nanomaterials with enzymatic catalytic properties. Compared with natural enzymes, nanozymes have the advantages such as low cost, high stability and durability, which have been widely used in industrial, medical, and biological fields. A thorough understanding of the possible catalytic mechanisms will contribute to the development of novel and high-efficient nanozymes, and the rational regulations of the activities of nanozymes are of great significance. In this review, we systematically introduce the classification, catalytic mechanism, activity regulation as well as recent research progress of nanozymes in the field of biosensing, environmental protection, and disease treatments, etc. in the past years. We also propose the current challenges of nanozymes as well as their future research focus. We anticipate this review may be of significance for the field to understand the properties of nanozymes and the development of novel nanomaterials with enzyme mimicking activities.
Collapse
Affiliation(s)
- Yanyan Huang
- Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China.,College of Light Industry and Food Engineering , Nanjing Forestry University , Nanjing 210037 , China
| | - Jinsong Ren
- Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
| | - Xiaogang Qu
- Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization , Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun , Jilin 130022 , China
| |
Collapse
|
58
|
Ye R, Mao X, Sun X, Chen P. Analogy between Enzyme and Nanoparticle Catalysis: A Single-Molecule Perspective. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04926] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Rong Ye
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Xianwen Mao
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Xiangcheng Sun
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Peng Chen
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| |
Collapse
|
59
|
Bentley CL, Edmondson J, Meloni GN, Perry D, Shkirskiy V, Unwin PR. Nanoscale Electrochemical Mapping. Anal Chem 2018; 91:84-108. [PMID: 30500157 DOI: 10.1021/acs.analchem.8b05235] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
60
|
Xu Y, Gao Y, Su Y, Sun L, Xing F, Fan C, Li D. Single-Molecule Studies of Allosteric Inhibition of Individual Enzyme on a DNA Origami Reactor. J Phys Chem Lett 2018; 9:6786-6794. [PMID: 30412409 DOI: 10.1021/acs.jpclett.8b02992] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Unraveling the conformational changes of enzymes together with inhibition kinetics during an enzymatic reaction has great potential in screening therapeutic candidates; however, it remains challenging due to the transient nature of each intermediate step. We report our study on the noncompetitive inhibition of horseradish peroxidase with single-turnover resolution using single-molecule fluorescence microscopy. By introducing DNA origami as an addressable nanoreactor, we observe the coexistence of nascent-formed fluorescent product on both catalytic and docking sites. We further propose a single-molecule kinetic model to reveal the interplay between product generation and noncompetitive inhibition and find three distinct inhibitor releasing pathways. Moreover, the kinetic isotope effect experiment indicates a strong correlation between catalytic and docking sites, suggesting an allosteric conformational change in noncompetitive inhibition. A memory effect is also observed. This work provides an in-depth understanding of the correlation between enzyme behavior and enzymatic conformational fluctuation, substrate conversion, and product releasing pathway and kinetics.
Collapse
Affiliation(s)
- Yan Xu
- School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200241 , China
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
- National Engineering Research Center for Nanotechnology , Shanghai 200241 , China
| | - Yanjing Gao
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Yingying Su
- School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200241 , China
- Department of Chemistry, College of Science , Shanghai University , Shanghai 200444 , China
| | - Lele Sun
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Feifei Xing
- Department of Chemistry, College of Science , Shanghai University , Shanghai 200444 , China
| | - Chunhai Fan
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
| | - Di Li
- School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200241 , China
- Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
| |
Collapse
|
61
|
Bentley CL, Kang M, Unwin PR. Nanoscale Surface Structure–Activity in Electrochemistry and Electrocatalysis. J Am Chem Soc 2018; 141:2179-2193. [DOI: 10.1021/jacs.8b09828] [Citation(s) in RCA: 139] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
| | - Minkyung Kang
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
| | - Patrick R. Unwin
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
| |
Collapse
|
62
|
Su H, Gao P, Wang M, Zhai G, Zhang J, Zhao T, Su J, Antonietti M, Li X, Chen J. Grouping Effect of Single Nickel−N
4
Sites in Nitrogen‐Doped Carbon Boosts Hydrogen Transfer Coupling of Alcohols and Amines. Angew Chem Int Ed Engl 2018; 57:15194-15198. [DOI: 10.1002/anie.201809858] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 09/21/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Hui Su
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Peng Gao
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Meng‐Ying Wang
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Guang‐Yao Zhai
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Jun‐Jun Zhang
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Tian‐Jian Zhao
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Juan Su
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Markus Antonietti
- Department of Colloid ChemistryMax Planck Institute of Colloids and Interfaces Potsdam-Golm Science Park 14476 Potsdam Germany
| | - Xin‐Hao Li
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Jie‐Sheng Chen
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| |
Collapse
|
63
|
Visualizing pore architecture and molecular transport boundaries in catalyst bodies with fluorescent nanoprobes. Nat Chem 2018; 11:23-31. [PMID: 30397319 DOI: 10.1038/s41557-018-0163-z] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 09/24/2018] [Indexed: 11/08/2022]
Abstract
The performances of porous materials are closely related to the accessibility and interconnectivity of their porous domains. Visualizing pore architecture and its role on functionality-for example, mass transport-has been a challenge so far, and traditional bulk and often non-visual pore measurements have to suffice in most cases. Here, we present an integrated, facile fluorescence microscopy approach to visualize the pore accessibility and interconnectivity of industrial-grade catalyst bodies, and link it unequivocally with their catalytic performance. Fluorescent nanoprobes of various sizes were imaged and correlated with the molecular transport of fluorescent molecules formed during a separate catalytic reaction. A direct visual relationship between the pore architecture-which depends on the pore sizes and interconnectivity of the material selected-and molecular transport was established. This approach can be applied to other porous materials, and the insight gained may prove useful in the design of more efficient heterogeneous catalysts.
Collapse
|
64
|
Cooperative Spin Transition of Monodispersed FeN3 Sites within Graphene Induced by CO Adsorption. J Am Chem Soc 2018; 140:15149-15152. [DOI: 10.1021/jacs.8b07816] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
|
65
|
Su H, Gao P, Wang M, Zhai G, Zhang J, Zhao T, Su J, Antonietti M, Li X, Chen J. Grouping Effect of Single Nickel−N
4
Sites in Nitrogen‐Doped Carbon Boosts Hydrogen Transfer Coupling of Alcohols and Amines. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201809858] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hui Su
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Peng Gao
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Meng‐Ying Wang
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Guang‐Yao Zhai
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Jun‐Jun Zhang
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Tian‐Jian Zhao
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Juan Su
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Markus Antonietti
- Department of Colloid ChemistryMax Planck Institute of Colloids and Interfaces Potsdam-Golm Science Park 14476 Potsdam Germany
| | - Xin‐Hao Li
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Jie‐Sheng Chen
- School of Chemistry and Chemical EngineeringShanghai Jiao Tong University Shanghai 200240 P. R. China
| |
Collapse
|
66
|
Thakore V, Tang J, Conley K, Ala‐Nissila T, Karttunen M. Thermoplasmonic Response of Semiconductor Nanoparticles: A Comparison with Metals. ADVANCED THEORY AND SIMULATIONS 2018. [DOI: 10.1002/adts.201800100] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Vaibhav Thakore
- Department of Applied MathematicsWestern University1151 Richmond Street London Ontario N6A 5B7 Canada
| | - Janika Tang
- QTF Center of ExcellenceDepartment of Applied PhysicsAalto University School of ScienceFIN‐00076 Aalto Espoo Finland
| | - Kevin Conley
- QTF Center of ExcellenceDepartment of Applied PhysicsAalto University School of ScienceFIN‐00076 Aalto Espoo Finland
| | - Tapio Ala‐Nissila
- QTF Center of ExcellenceDepartment of Applied PhysicsAalto University School of ScienceFIN‐00076 Aalto Espoo Finland
- Department of PhysicsBrown UniversityProvidence Rhode Island 02912‐1843 USA
- Interdisciplinary Centre for Mathematical ModellingDepartment of Mathematical SciencesLoughborough UniversityLoughborough LE11 3TU UK
| | - Mikko Karttunen
- Department of Applied MathematicsWestern University1151 Richmond Street London Ontario N6A 5B7 Canada
- Department of ChemistryWestern University1151 Richmond Street London Ontario N6A 5B7 Canada
| |
Collapse
|
67
|
Ristanović Z, Chowdhury AD, Brogaard RY, Houben K, Baldus M, Hofkens J, Roeffaers MBJ, Weckhuysen BM. Reversible and Site-Dependent Proton-Transfer in Zeolites Uncovered at the Single-Molecule Level. J Am Chem Soc 2018; 140:14195-14205. [PMID: 30280894 PMCID: PMC6213027 DOI: 10.1021/jacs.8b08041] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
![]()
Zeolite
activity and selectivity is often determined by the underlying
proton and hydrogen-transfer reaction pathways. For the first time,
we use single-molecule fluorescence microscopy to directly follow
the real-time behavior of individual styrene-derived carbocationic
species formed within zeolite ZSM-5. We find that intermittent fluorescence
and remarkable photostability of carbocationic intermediates strongly
depend on the local chemical environment imposed by zeolite framework
and guest solvent molecules. The carbocationic stability can be additionally
altered by changing para-substituent on the styrene
moiety, as suggested by DFT calculations. Thermodynamically unstable
carbocations are more likely to switch between fluorescent (carbocationic)
and dark (neutral) states. However, the rate constants of this reversible
change can significantly differ among individual carbocations, depending
on their exact location in the zeolite framework. The lifetimes of
fluorescent states and reversibility of the process can be additionally
altered by changing the interaction between dimeric carbocations and
solvated Brønsted acid sites in the MFI framework. Advanced multidimensional
magic angle spinning solid-state NMR spectroscopy has been employed
for the accurate structural elucidation of the reaction products during
the zeolite-catalyzed dimerization of styrene in order to corroborate
the single-molecule fluorescence microscopy data. This complementary
approach of single-molecule fluorescence microscopy, NMR, and DFT
collectively indicates that the relative stability of the carbocationic
and the neutral states largely depends on the substituent and the
local position of the Brønsted acid site within the zeolite framework.
As a consequence, new insights into the host–guest chemistry
between the zeolite and aromatics, in terms of their surface mobility
and reactivity, have been obtained.
Collapse
Affiliation(s)
- Zoran Ristanović
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science , Utrecht University , Universiteitsweg 99 , 3584 CG Utrecht , The Netherlands
| | - Abhishek Dutta Chowdhury
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science , Utrecht University , Universiteitsweg 99 , 3584 CG Utrecht , The Netherlands
| | - Rasmus Y Brogaard
- Department of Chemistry , University of Oslo , Postboks 1126 Blindern, 0318 Oslo , Norway
| | - Klaartje Houben
- NMR Research Group, Bijvoet Centre for Biomolecular Research , Utrecht University , Universiteitsweg 99 , 3584 CG Utrecht , The Netherlands
| | - Marc Baldus
- NMR Research Group, Bijvoet Centre for Biomolecular Research , Utrecht University , Universiteitsweg 99 , 3584 CG Utrecht , The Netherlands
| | - Johan Hofkens
- Department of Chemistry , KU Leuven , Celestijnenlaan 200 F , B-3001 Leuven , Belgium
| | - Maarten B J Roeffaers
- Centre for Surface Chemistry and Catalysis , KU Leuven , Kasteelpark Arenberg 23 , 3001 Heverlee , Belgium
| | - Bert M Weckhuysen
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science , Utrecht University , Universiteitsweg 99 , 3584 CG Utrecht , The Netherlands
| |
Collapse
|
68
|
Saha P, Hill JW, Walmsley JD, Hill CM. Probing Electrocatalysis at Individual Au Nanorods via Correlated Optical and Electrochemical Measurements. Anal Chem 2018; 90:12832-12839. [DOI: 10.1021/acs.analchem.8b03360] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Partha Saha
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Joshua W. Hill
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Joshua D. Walmsley
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
| | - Caleb M. Hill
- Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071, United States
| |
Collapse
|
69
|
|
70
|
Zhao X, Xu H, Wang X, Zheng Z, Xu Z, Ge J. Monodisperse Metal-Organic Framework Nanospheres with Encapsulated Core-Shell Nanoparticles Pt/Au@Pd@{Co 2(oba) 4(3-bpdh) 2}4H 2O for the Highly Selective Conversion of CO 2 to CO. ACS APPLIED MATERIALS & INTERFACES 2018; 10:15096-15103. [PMID: 29641173 DOI: 10.1021/acsami.8b03561] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A new microporous metal-organic framework (MOF) with formula {Co2(oba)4(3-bpdh)2}4H2O [oba = 4,4'-oxybis(benzoic acid); 3-bpdh = N, N'-bis-(1-pyridine-3-yl-ethylidene)-hydrazine] was assembled, and its morphology was found to undergo a microrod-to-nanosphere transformation with temperature variation. Core-shell Au@Pd functional nanoparticles (NPs) were successfully encapsulated in the center of the monodisperse nanospheres, and Pt NPs were well-dispersed and fully immobilized on the surface of Au@Pd@1Co to build the Pt/Au@Pd@1Co composites, which exhibited NPs catalytic activity for the reverse water gas shift reaction. The core-shell Au@Pd NPs in MOF significantly enchanced the CO selectivity of the catalyst, and the Pt NP loading on the surface of the nanosphere afforded a desirable CO2 conversion.
Collapse
Affiliation(s)
- Xi Zhao
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center , East China University of Science and Technology , Shanghai 200237 , China
| | - Haitao Xu
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center , East China University of Science and Technology , Shanghai 200237 , China
| | - XiaoXiao Wang
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center , East China University of Science and Technology , Shanghai 200237 , China
| | - Zhizhong Zheng
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center , East China University of Science and Technology , Shanghai 200237 , China
| | - Zhenliang Xu
- State Key Laboratory of Chemical Engineering, Membrane Science and Engineering R&D Lab, Chemical Engineering Research Center , East China University of Science and Technology , Shanghai 200237 , China
| | - Jianping Ge
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering , East China Normal University , Shanghai 200062 , China
| |
Collapse
|