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Armillotta F, Bidoggia D, Baronio S, Biasin P, Annese A, Scardamaglia M, Zhu S, Bozzini B, Modesti S, Peressi M, Vesselli E. Single Metal Atom Catalysts and ORR: H-Bonding, Solvation, and the Elusive Hydroperoxyl Intermediate. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francesco Armillotta
- Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
| | - Davide Bidoggia
- Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
| | - Stefania Baronio
- Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
| | - Pietro Biasin
- Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
| | - Antonio Annese
- Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
| | | | - Suyun Zhu
- MAX IV Laboratory, Fotongatan 8, 224 84 Lund, Sweden
| | | | - Silvio Modesti
- Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
- CNR-IOM, Area Science Park, S.S. 14 km 163.5, 34149 Basovizza, Trieste, Italy
| | - Maria Peressi
- Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
| | - Erik Vesselli
- Department of Physics, University of Trieste, via A. Valerio 2, 34127 Trieste, Italy
- CNR-IOM, Area Science Park, S.S. 14 km 163.5, 34149 Basovizza, Trieste, Italy
- Center for Energy, Environment and Transport Giacomo Ciamician, University of Trieste, 34127 Trieste, Italy
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Dioxygen at Biomimetic Single Metal-Atom Sites: Stabilization or Activation? The Case of CoTPyP/Au(111). Top Catal 2020. [DOI: 10.1007/s11244-020-01333-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
AbstractBy means of a combined experimental and computational approach, we show that a 2D metal–organic framework self-assembled at the Au(111) termination is able to mimic the O2 stabilization and activation mechanisms that are typical of the biochemical environment of proteins and enzymes. 5,10,15,20-tetra(4-pyridyl)21H,23H-porphyrin cobalt(III) chloride (CoTPyP) molecules on Au(111) bind dioxygen forming a covalent bond at the Co center, yielding charge injection into the ligand by exploiting the surface trans-effect. A weakening of the O–O bond occurs, together with the development of a dipole moment, and a change in the molecule’s magnetic moment. Also the bonding geometry is similar to the biological counterpart, with the O2 molecule sitting on-top of the Co atom and the molecular axis tilted by 118°. The ligand configuration lays between the oxo- and the superoxo-species, in agreement with the observed O–O stretching frequency measured in situ at near-ambient pressure conditions.
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Vibrational fingerprint of localized excitons in a two-dimensional metal-organic crystal. Nat Commun 2018; 9:4703. [PMID: 30409974 PMCID: PMC6224418 DOI: 10.1038/s41467-018-07190-1] [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] [Received: 01/09/2018] [Accepted: 10/16/2018] [Indexed: 11/08/2022] Open
Abstract
Long-lived excitons formed upon visible light absorption play an essential role in photovoltaics, photocatalysis, and even in high-density information storage. Here, we describe a self-assembled two-dimensional metal-organic crystal, composed of graphene-supported macrocycles, each hosting a single FeN4 center, where a single carbon monoxide molecule can adsorb. In this heme-like biomimetic model system, excitons are generated by visible laser light upon a spin transition associated with the layer 2D crystallinity, and are simultaneously detected via the carbon monoxide ligand stretching mode at room temperature and near-ambient pressure. The proposed mechanism is supported by the results of infrared and time-resolved pump-probe spectroscopies, and by ab initio theoretical methods, opening a path towards the handling of exciton dynamics on 2D biomimetic crystals. Long-lived excitons in a two-dimensional metal-organic crystal can be produced by visible light and detected by infrared radiation. Here, the authors show that the excitonic state of a biomimetic macrocycle can be ‘read’ by measuring the vibrations of an adsorbed ligand.
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Podda N, Corva M, Mohamed F, Feng Z, Dri C, Dvorák F, Matolin V, Comelli G, Peressi M, Vesselli E. Experimental and Theoretical Investigation of the Restructuring Process Induced by CO at Near Ambient Pressure: Pt Nanoclusters on Graphene/Ir(111). ACS NANO 2017; 11:1041-1053. [PMID: 28029767 DOI: 10.1021/acsnano.6b07876] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The adsorption of CO on Pt nanoclusters grown in a regular array on a template provided by the graphene/Ir(111) Moiré was investigated by means of infrared-visible sum frequency generation vibronic spectroscopy, scanning tunneling microscopy, X-ray photoelectron spectroscopy from ultrahigh vacuum to near-ambient pressure, and ab initio simulations. Both terminally and bridge bonded CO species populate nonequivalent sites of the clusters, spanning from first to second-layer terraces to borders and edges, depending on the particle size and morphology and on the adsorption conditions. By combining experimental information and the results of the simulations, we observe a significant restructuring of the clusters. Additionally, above room temperature and at 0.1 mbar, Pt clusters catalyze the spillover of CO to the underlying graphene/Ir(111) interface.
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Affiliation(s)
- Nicola Podda
- Physics Department, University of Trieste , via A. Valerio 2, Trieste 34127, Italy
| | - Manuel Corva
- Physics Department, University of Trieste , via A. Valerio 2, Trieste 34127, Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park, Basovizza ,Trieste 34149, Italy
| | - Fatema Mohamed
- Physics Department, University of Trieste , via A. Valerio 2, Trieste 34127, Italy
- International Centre for Theoretical Physics ICTP , Strada Costiera 11, Trieste 34151, Italy
| | - Zhijing Feng
- Physics Department, University of Trieste , via A. Valerio 2, Trieste 34127, Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park, Basovizza ,Trieste 34149, Italy
| | - Carlo Dri
- Physics Department, University of Trieste , via A. Valerio 2, Trieste 34127, Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park, Basovizza ,Trieste 34149, Italy
| | - Filip Dvorák
- Faculty of Mathematics and Physics, Charles University in Prague , V Holešovickách 2, Praha 8 180 00, Czech Republica
| | - Vladimir Matolin
- Faculty of Mathematics and Physics, Charles University in Prague , V Holešovickách 2, Praha 8 180 00, Czech Republica
| | - Giovanni Comelli
- Physics Department, University of Trieste , via A. Valerio 2, Trieste 34127, Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park, Basovizza ,Trieste 34149, Italy
| | - Maria Peressi
- Physics Department, University of Trieste , via A. Valerio 2, Trieste 34127, Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park, Basovizza ,Trieste 34149, Italy
| | - Erik Vesselli
- Physics Department, University of Trieste , via A. Valerio 2, Trieste 34127, Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park, Basovizza ,Trieste 34149, Italy
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Lyon JT, Gruene P, Fielicke A, Meijer G, Rayner DM. Probing C–O bond activation on gas-phase transition metal clusters: Infrared multiple photon dissociation spectroscopy of Fe, Ru, Re, and W cluster CO complexes. J Chem Phys 2009; 131:184706. [DOI: 10.1063/1.3257687] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Benjamin I. Theoretical Studies of Solute Vibrational Energy Relaxation at Liquid Interfaces. J Phys Chem B 2006; 110:9375-82. [PMID: 16686479 DOI: 10.1021/jp056420y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Recent advances in the theoretical understanding of solute vibrational energy relaxation at liquid interfaces and surfaces are described. Non-equilibrium molecular dynamics simulations of the relaxation of an initially excited solute molecule are combined with equilibrium force autocorrelation calculations to gain insight into the factors that influence the vibrational relaxation rate. Diatomic and triatomic nonpolar, polar, and ionic solute molecules adsorbed at the liquid/vapor interface of several liquids as well as at the water/CCl(4) liquid/liquid interface are considered. In general, the vibrational relaxation rate is significantly slower (a factor of 3 to 4) at the liquid/vapor and liquid/liquid interface than in the bulk due to the reduced density, which gives rise to a reduced contribution of the repulsive solvent-solute forces on the vibrational mode. The surface effects on the ionic solutes are much smaller (50% or less slower relaxation relative to the bulk). This is due to the fact that ionic solutes at the interface are able to keep part of their solvation shell to a degree that depends on their size. Thus, a significant portion of the repulsive forces is maintained. A high degree of correlation is found between the peak height of the solvent-solute radial distribution function and the vibrational relaxation rate. The relaxation rate at the liquid/liquid interface strongly depends on the location of the solute across the interface and correlates with the change in the density and polarity profile of the interface.
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Affiliation(s)
- Ilan Benjamin
- Department of Chemistry and Biochemistry, University of California at Santa Cruz, Santa Cruz, CA 95064, USA
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