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Nurhayati, Suendo V, Alni A, Nugroho AA, Majima Y, Lee S, Nugraha YP, Uekusa H. Revealing the Real Size of a Porphyrin Molecule with Quantum Confinement Probing via Temperature-Dependent Photoluminescence Spectroscopy. J Phys Chem A 2020; 124:2672-2682. [PMID: 32207935 DOI: 10.1021/acs.jpca.0c00665] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The confinement energy of electrons in an aromatic molecule was studied by indirect and direct methods, namely, temperature-dependent photoluminescence (TDPL) spectroscopy and scanning tunneling microscopy (STM). We observed a decrease in the tetraphenylporphyrin (H2TPP) PL intensity with increasing temperature. The increase in temperature provides kinetic energy for the electrons to overcome the confinement energy barrier, making recombination via nonradiative pathways more favorable. The results of fitting the integrated TDPL intensity with a modified Arrhenius equation suggest two confinement energy values. We propose that these energy values are related to the size of the delocalized electron cloud along the plane and thickness of the H2TPP ring. These values quantitatively express an abstract form of the size of the aromatic ring system. These results are in good agreement with the topography images of single H2TPP molecules and monolayer H2TPP obtained by a direct probing method using STM. These results are also supported by the porphyrin ring orientation relative to the excited crystal face during the TDPL measurements.
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Affiliation(s)
| | | | | | | | - Yutaka Majima
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Seungjoo Lee
- Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | | | - Hidehiro Uekusa
- Department of Chemistry, School of Science, Tokyo Institute of Technology, Tokyo 152-8851, Japan
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Li H, Wang Y, He Y, Xu Z, Zhao X, Han Y. Synthesis of several novel coordination complexes: ion exchange, magnetic and photocatalytic studies. NEW J CHEM 2017. [DOI: 10.1039/c6nj02863b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Eight different novel polymers by the reactions of H2L and metal ions (Zn2+, Cu2+, Co2+) in the presence or absence of auxiliary ligands were constructed. The Zn2+ in complexes 1–3 could be partially exchanged with Cu2+ ions.
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Affiliation(s)
- Huijun Li
- College of Chemistry and Chemical Engineering
- Henan Polytechnic University
- Jiaozuo
- China
| | - Yuan Wang
- College of Chemistry and Chemical Engineering
- Henan Polytechnic University
- Jiaozuo
- China
| | - Yaling He
- College of Chemistry and Chemical Engineering
- Henan Polytechnic University
- Jiaozuo
- China
| | - Zhouqing Xu
- College of Chemistry and Chemical Engineering
- Henan Polytechnic University
- Jiaozuo
- China
| | - Xiaolei Zhao
- College of Chemistry and Chemical Engineering
- Henan Polytechnic University
- Jiaozuo
- China
| | - Yi Han
- Key Laboratory of Eco-chemical Engineering
- Ministry of Education
- Inorganic Synthesis and Applied Chemistry
- College of Chemistry and Molecular Engineering
- Qingdao University of Science and Technology
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Pham VD, Repain V, Chacon C, Bellec A, Girard Y, Rousset S, Smogunov A, Dappe YJ, Lagoute J. Control of Molecule-Metal Interaction by Hydrogen Manipulation in an Organic Molecule. J Phys Chem Lett 2016; 7:1416-1421. [PMID: 27028149 DOI: 10.1021/acs.jpclett.6b00476] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Free-base porphyrin molecules offer appealing options to tune the interaction with their environment via the manipulation of their inner hydrogen atoms and molecular conformation. Using scanning tunneling microscopy we show, through a systematic study, that the molecular conformation, electronic gap, wave function, and molecule-substrate interaction are modified by hydrogen switch or removal. Experimental results in combination with ab initio calculations provide an understanding of the underlying physical process.
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Affiliation(s)
- Van Dong Pham
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-Université Paris 7 , 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
| | - Vincent Repain
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-Université Paris 7 , 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
| | - Cyril Chacon
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-Université Paris 7 , 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
| | - Amandine Bellec
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-Université Paris 7 , 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
| | - Yann Girard
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-Université Paris 7 , 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
| | - Sylvie Rousset
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-Université Paris 7 , 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
| | - Alexander Smogunov
- SPEC, CEA, CNRS, Université Paris-Saclay , CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - Yannick J Dappe
- SPEC, CEA, CNRS, Université Paris-Saclay , CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - Jérôme Lagoute
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-Université Paris 7 , 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
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Iancu V, Schouteden K, Li Z, Van Haesendonck C. Electron–phonon coupling in engineered magnetic molecules. Chem Commun (Camb) 2016; 52:11359-11362. [DOI: 10.1039/c6cc03847f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We probe electron–phonon coupling in CoTPyP and CrTPyP synthesized magnetic molecules. Low temperatures STS reveals pronounced Kondo resonances at zero bias in both molecules and additional Kondo resonance replicas observed at higher voltages in vibrating CoTPyP molecules.
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Affiliation(s)
- Violeta Iancu
- Laboratory of Solid-State Physics and Magnetism
- KU Leuven
- BE-3001 Leuven
- Belgium
- Extreme Light Infrastructure – Nuclear Physics/Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
| | - Koen Schouteden
- Laboratory of Solid-State Physics and Magnetism
- KU Leuven
- BE-3001 Leuven
- Belgium
| | - Zhe Li
- Laboratory of Solid-State Physics and Magnetism
- KU Leuven
- BE-3001 Leuven
- Belgium
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Zhang Q, Kuang G, Pang R, Shi X, Lin N. Switching Molecular Kondo Effect via Supramolecular Interaction. ACS NANO 2015; 9:12521-12528. [PMID: 26568262 DOI: 10.1021/acsnano.5b06120] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We apply supramolecular assembly to control the adsorption configuration of Co-porphyrin molecules on Au(111) and Cu(111) surfaces. By means of cryogenic scanning tunneling microscopy, we reveal that the Kondo effect associated with the Co center is absent or present in different supramolecular systems. We perform first-principles calculations to obtain spin-polarized electronic structures and compute the Kondo temperatures using the Anderson impurity model. The switching behavior is traced to varied molecular adsorption heights in different supramolecular structures. These findings unravel that a competition between intermolecular interactions and molecule-substrate interactions subtly regulates the molecular Kondo effect in supramolecular systems.
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Affiliation(s)
- Qiushi Zhang
- Department of Physics, The Hong Kong University of Science and Technology , Hong Kong, China
| | - Guowen Kuang
- Department of Physics, The Hong Kong University of Science and Technology , Hong Kong, China
| | - Rui Pang
- Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China
| | - Xingqiang Shi
- Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China
| | - Nian Lin
- Department of Physics, The Hong Kong University of Science and Technology , Hong Kong, China
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