Article
Chemistry, Multidisciplinary
Jonas Bjork, Carlos Sanchez-Sanchez, Qiang Chen, Carlo A. Pignedoli, Johanna Rosen, Pascal Ruffieux, Xinliang Feng, Akimitsu Narita, Klaus Mullen, Roman Fasel
Summary: This study reveals the importance of metal adatoms and their effect on regioselectivity in surface-assisted cyclodehydrogenation on Au(111).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Physical
F. Besenbacher, J. Lauritsen
Summary: Scanning probe microscopy plays a crucial role in hydroprocessing catalysis by revealing nanoparticle structures, active edge structures, and complex hydrocarbon structures at the atomic scale, as well as providing detailed information on the interaction mechanisms between heteroatom-containing hydrocarbons and catalyst particles. The emerging techniques such as near-ambient pressure scanning tunneling microscopy and low-temperature molecular imaging are also highlighted for their potential in advancing the field.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Yong Zhang, Jianchen Lu, Hangjing Zhou, Guang Zhang, Zilin Ruan, Yi Zhang, Hui Zhang, Shijie Sun, Geifei Niu, Boyu Fu, Bing Yang, Long Chen, Lei Gao, Jinming Cai
Summary: In this study, we investigated the regioselectivity of 2H-diphenylporphyrin (H-2-DPP) in the planarization reaction on Au(111) and Ag(111) substrates. We found that H-2-DPP monomer can form two configurations (anti- and syn-) via a dehydrogenation coupling, with the yield of the anti-configuration exceeding 90%. Through high-resolution scanning tunneling microscopy, DFT calculations, and comparative experiments, we determined that the regioselectivity of H-2-DPP is derived from the reaction energy barrier during the cyclodehydrogenation reaction of different tautomers.
Article
Chemistry, Multidisciplinary
Cunrui Fan, Bangjin Sun, Zhanbo Li, Jiwei Shi, Tao Lin, Jian Fan, Ziliang Shi
Summary: The study successfully achieved on-surface synthesis of giant conjugated macrocycles with a diameter of approximately 7 nm, starting with debrominative coupling of molecular precursors on a hot Ag(111) surface. The final conjugation of the macrocycles was achieved through subsequent cyclodehydrogenation at higher temperatures. This method provides a new design strategy for pi-conjugated macrocycles and opens up new opportunities for precise synthesis of organic nanostructures.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Xue-Qing Yang, Jun-Jie Duan, Jie Su, Xinnan Peng, Zhen-Yu Yi, Ruo-Ning Li, Jiong Lu, Sheng-Fu Wang, Ting Chen, Dong Wang
Summary: Aromatic ring fusion to porphyrins and their derivatives can be achieved via surface-assisted gamma-ortho cyclodehydrogenation, leading to the formation of nearly planar gamma-ortho fused porphyrins with decreased electronic gap compared to the precursor.
Review
Chemistry, Physical
Chunlei Yang, Tianhui Su, Yanbo Hua, Liming Zhang
Summary: This review summarizes the latest results of electrochemical scanning probe microscopy techniques in studying the interfacial properties of electrocatalysts and photoelectrodes, and offers some perspectives on future research directions.
Article
Chemistry, Multidisciplinary
Carsten Schroeder, Marvin C. Schmidt, Philipp A. Haugg, Ann-Katrin Baumann, Jan Smyczek, Swetlana Schauermann
Summary: The study provides insights into the formation and dynamic changes of an active ligand layer on a Pd catalyst during chemoselective hydrogenation, which is crucial for controlling chemoselectivity through purposeful surface functionalization.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Chemistry, Physical
Prachi Ghoderao, Sanjay Sahare, Shern-Long Lee, Prashant Sonar
Summary: Scanning probe microscopy (SPM) is a powerful technique that allows for the observation and analysis of nanoscale materials and biological molecules through the use of sharp probes that scan the sample surface. This method, which includes scanning tunneling microscopy (STM) and atomic force microscopy (AFM), provides valuable insights into the properties and behavior of these materials at a molecular level. This review highlights the applications of SPM in biomolecule imaging and the study of physiological processes, as well as the challenges and potential solutions in biological sample preparation. It also discusses the recent advancements in STM and AFM applications on biomolecules, such as DNA, proteins, and carbohydrates, and their potential applications in fields like drug delivery and biosensors.
Article
Engineering, Biomedical
Yuji Nashimoto, Minori Abe, Ryota Fujii, Noriko Taira, Hiroki Ida, Yasufumi Takahashi, Kosuke Ino, Javier Ramon-Azcon, Hitoshi Shiku
Summary: This study evaluates the role of scanning probe microscopy (SPM) as an analytical tool for microphysiological systems (MPS), providing a new solution for real-time high spatial resolution imaging. A simple vascular model was used for permeability and topographical analysis, paving the way for the application of SPM technology in MPS.
ADVANCED HEALTHCARE MATERIALS
(2021)
Review
Chemistry, Physical
Swetlana Schauermann
Summary: Hydrogenation of carbonyl compounds to alcohols is a crucial step in many technological applications, but its experimental challenges have hindered progress. However, theoretical predictions suggest that a two-step reaction pathway involving keto-enol tautomerization and hydrogen insertion into the C=C bond of enol could provide a feasible alternative. Recent atomistic-level investigations have demonstrated the formation and stabilization of enol species through hydrogen bonding, offering insights into the low-barrier hydrogenation of carbonyls.
Article
Chemistry, Multidisciplinary
Kohei Yamasue, Yasuo Cho
Summary: Scanning nonlinear dielectric microscopy (SNDM) is a near-field microwave-based scanning probe microscopy method that has wide applications. It is often combined with contact-mode atomic force microscopy (AFM) for topography imaging and contact force regulation. However, SNDM with intermittent contact AFM may result in a lower signal-to-noise ratio. To improve this, we propose a boxcar averaging based signal acquisition method and demonstrate its enhancement on SNDM combined with peak-force tapping AFM. The proposed method is also applicable to other scanning near-field microwave microscopes.
Article
Chemistry, Physical
Juan Camilo Arango-Daza, Carles Lluna-Galan, Luis Izquierdo-Aranda, Jose R. Cabrero-Antonino, Rosa Adam
Summary: A heterogeneous catalytic system for the acceptorless dehydrogenative condensation between N,N'-disubstituted ureas and 1,2-diols to produce imidazolones was developed. The designed palladium nanoaggregates on an alumina matrix showed good activity and selectivity, with wide applicability and moderate to good yields. Mechanistic studies and characterization were performed, revealing the key factors for the catalyst's activity. Furthermore, a Pd-Zn cooperation effect was described, and bimetallic materials were also designed and characterized properly.
Review
Chemistry, Multidisciplinary
David Necas, Petr Klapetek
Summary: Synthetic data play an increasingly important role in nanometrology for development of data processing methods and analysis of uncertainties. This paper reviews methods for generating synthetic data and their applications in scanning probe microscopy, focusing on principles, performance, and applicability. The benefits of using synthetic data in tasks related to improving scanning approaches and estimating reliability of data processing methods are demonstrated, along with analyzing systematic errors common to scanning probe microscopy methods.
Article
Chemistry, Multidisciplinary
Nicolas Neel, Joerg Kroeger
Summary: The study revealed that the formation of a chemical bond between a CO molecule and a Cu(111) surface is accompanied by bending of the molecular probe due to van der Waals attraction and Pauli repulsion, resulting in characteristic changes in the vertical force between CO and Cu(111) as a function of molecule-surface distance. Experimental data were successfully reproduced by model calculations, shedding new light on vertical-force extrema in scanning probe experiments.
Article
Chemistry, Physical
Luca Deiana, Elham Badali, Abdolrahim A. Rafi, Cheuk-Wai Tai, Jan-E Backvall, Armando Cordova
Summary: This article describes efficient nanogold-catalyzed cycloisomerization reactions of alkynoic acids and allenynamides, resulting in the formation of enol lactones and dihydropyrroles, respectively. The gold nanoparticles were immobilized on thiol-functionalized microcrystalline cellulose and exhibited robust catalytic activity for multiple cycles.
Article
Chemistry, Multidisciplinary
Lawrence T. Scott
PURE AND APPLIED CHEMISTRY
(2017)
Article
Chemistry, Multidisciplinary
Celine Schneider, Hidetaka Nishimura, Jaehyun Lee, Lawrence T. Scott, Atsushi Wakamiya, Roy Forbes, Paris E. Georghiou
SUPRAMOLECULAR CHEMISTRY
(2018)
Article
Chemistry, Multidisciplinary
Hsing-An Lin, Yoshikatsu Sato, Yasutomo Segawa, Taishi Nishihara, Nagisa Sugimoto, Lawrence T. Scott, Tetsuya Higashiyama, Kenichiro Itami
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2018)
Article
Chemistry, Multidisciplinary
Kenta Kato, Yasutomo Segawa, Lawrence T. Scott, Kenichiro Itami
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2018)
Article
Chemistry, Organic
Kazuya Kawai, Kenta Kato, Lingqing Peng, Yasutomo Segawa, Lawrence T. Scott, Kenichiro Itami
Article
Chemistry, Organic
Paris E. Georghiou, Shofiur Rahman, Abdullah Alodhayb, Hidetaka Nishimura, Jaehyun Lee, Atsushi Wakamiya, Lawrence T. Scott
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY
(2018)
Article
Chemistry, Multidisciplinary
Jose Urgel, Marco Di Giovannantonio, Yasutomo Segawa, Pascal Ruffieux, Lawrence T. Scott, Carlo A. Pignedoli, Kenichiro Itami, Roman Fasel
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Multidisciplinary Sciences
Zheng-Zhong Zhu, Zuo-Chang Chen, Yang-Rong Yao, Cun-Hao Cui, Shu-Hui Li, Xin-Jing Zhao, Qianyan Zhang, Han-Rui Tian, Piao-Yang Xu, Fang-Fang Xie, Xiao-Ming Xie, Yuan-Zhi Tan, Shun-Liu Deng, Jennifer M. Quimby, Lawrence T. Scott, Su-Yuan Xie, Rong-Bin Huang, Lan-Sun Zheng
Article
Chemistry, Multidisciplinary
Guglielmo Monaco, Emeritus Lawrence T. Scott, Riccardo Zanasi
Article
Chemistry, Physical
Francesco F. Summa, Guglielmo Monaco, Lawrence T. Scott, Riccardo Zanasi
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Hideya Kono, Yuanming Li, Guglielmo Monaco, Riccardo Zanasi, Francesco F. Summa, Lawrence T. Scott, Akiko Yagi, Kenichiro Itami
Summary: Cycloparaphenylenes (CPPs) and carbon nanobelts (CNBs) are cyclic molecular nanocarbons with unique properties derived from rigid, strained, and cyclic p-conjugated systems. The synthesis of various sizes of CPPs and CNBs has allowed for the investigation of their size-dependent properties and use in various applications. The synthesis, size-dependent properties, and paratropic belt currents of methylene-bridged [n]cycloparaphenylenes ([n]MCPP, n = 6, 8, 10) were reported and studied.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Kanna Fujishiro, Yuta Morinaka, Yohei Ono, Tsuyoshi Tanaka, Lawrence T. Scott, Hideto Ito, Kenichiro Itami
Summary: In this study, a lithium(0)-mediated mechanochemical anionic cyclodehydrogenation reaction was developed for the first time. The reaction could be easily performed using a conventional and easy-to-handle lithium(0) wire at room temperature, even under air, and achieved high yields in a short time. The study also comprehensively investigated the applicability and practicality of the protocol, as well as limitations, through computational studies and nuclear magnetic resonance analysis. Furthermore, novel nanographenes, including quinterrylene, were successfully synthesized using this method.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Kenta Kato, Hsing-An Lin, Motonobu Kuwayama, Mai Nagase, Yasutomo Segawa, Lawrence T. Scott, Kenichiro Itami
Article
Chemistry, Multidisciplinary
Hsing-An Lin, Kenta Kato, Yasutomo Segawa, Lawrence T. Scott, Kenichiro Itami
Article
Chemistry, Multidisciplinary
Natalie J. Smith, Lawrence T. Scott
CANADIAN JOURNAL OF CHEMISTRY
(2017)
