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Anni M. Investigation of the Origin of High Photoluminescence Quantum Yield in Thienyl-S,S-dioxide AIEgens Oligomers by Temperature Dependent Optical Spectroscopy. Molecules 2023; 28:5161. [PMID: 37446823 DOI: 10.3390/molecules28135161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 06/23/2023] [Accepted: 06/27/2023] [Indexed: 07/15/2023] Open
Abstract
The development of organic molecules showing high photoluminescence quantum yield (PLQY) in solid state is a fundamental step for the implementation of efficient light emitting devices. In this work the origin of the high PLQY of two trimers and two pentamers having one central thiophene-S,S-dioxide unit and two and four lateral thiophene or phenyl groups, respectively, is investigated by temperature dependent photoluminescence and time resolved photoluminescence measurements. The experimental results demonstrate that the molecules with lateral phenyl rings show higher PLQY due to a weaker coupling with intramolecular vibrations-related to variations in the radiative and non-radiative decay rates-and indicate different molecular rigidity as the main factors affecting the PLQY of this class of molecules.
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Affiliation(s)
- Marco Anni
- Dipartimento di Matematica e Fisica "Ennio De Giorgi", Università del Salento, Via per Arnesano, 73100 Lecce, Italy
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2
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Cerpentier FJR, Karlsson J, Lalrempuia R, Brandon MP, Sazanovich IV, Greetham GM, Gibson EA, Pryce MT. Ruthenium Assemblies for CO 2 Reduction and H 2 Generation: Time Resolved Infrared Spectroscopy, Spectroelectrochemistry and a Photocatalysis Study in Solution and on NiO. Front Chem 2022; 9:795877. [PMID: 35004612 PMCID: PMC8738169 DOI: 10.3389/fchem.2021.795877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 11/29/2021] [Indexed: 11/13/2022] Open
Abstract
Two novel supramolecular complexes RuRe ([Ru(dceb)2(bpt)Re(CO)3Cl](PF6)) and RuPt ([Ru(dceb)2(bpt)PtI(H2O)](PF6)2) [dceb = diethyl(2,2′-bipyridine)-4,4′-dicarboxylate, bpt = 3,5-di(pyridine-2-yl)-1,2,4-triazolate] were synthesized as new catalysts for photocatalytic CO2 reduction and H2 evolution, respectively. The influence of the catalytic metal for successful catalysis in solution and on a NiO semiconductor was examined. IR-active handles in the form of carbonyl groups on the peripheral ligand on the photosensitiser were used to study the excited states populated, as well as the one-electron reduced intermediate species using infrared and UV-Vis spectroelectrochemistry, and time resolved infrared spectroscopy. Inclusion of ethyl-ester moieties led to a reduction in the LUMO energies on the peripheral bipyridine ligand, resulting in localization of the 3MLCT excited state on these peripheral ligands following excitation. RuPt generated hydrogen in solution and when immobilized on NiO in a photoelectrochemical (PEC) cell. RuRe was inactive as a CO2 reduction catalyst in solution, and produced only trace amounts of CO when the photocatalyst was immobilized on NiO in a PEC cell saturated with CO2.
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Affiliation(s)
| | - Joshua Karlsson
- Energy Materials Laboratory, Department of Chemistry, School of Natural and Environmental Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Ralte Lalrempuia
- School of Chemical Sciences, Dublin City University, Dublin, Ireland.,Department of Chemistry, School of Physical Sciences, Mizoram University, Aizawl, India
| | - Michael P Brandon
- School of Chemical Sciences, Dublin City University, Dublin, Ireland
| | - Igor V Sazanovich
- Central Laser Facility, Science and Technology Facilities Council, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxford, United Kingdom
| | - Gregory M Greetham
- Central Laser Facility, Science and Technology Facilities Council, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxford, United Kingdom
| | - Elizabeth A Gibson
- Energy Materials Laboratory, Department of Chemistry, School of Natural and Environmental Science, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Mary T Pryce
- School of Chemical Sciences, Dublin City University, Dublin, Ireland
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3
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Bildé A, Redeckas K, Melninkaitis A, Vengris M, Guizard S. Time resolved study of carrier relaxation dynamics in α-Al 2O 3. J Phys Condens Matter 2021; 33:315402. [PMID: 34030152 DOI: 10.1088/1361-648x/ac0475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/24/2021] [Indexed: 06/12/2023]
Abstract
The relaxation of excited carriers in α-Al2O3is complex, depending for instance on the type of ionizing radiation. Using femtosecond time-resolved absorption spectroscopy, we can induce a controllable excitation density on a wide range, and follow the relaxation dynamics from 30 fs to 7 ns. We show that the excited carrier decay is non-exponential: it is dependent on the pump intensity, i.e. on the initial carrier concentration. We describe the relaxation as a two-steps process, involving the trapping of initially free electron-hole pairs, followed by recombination. A numerical model taking into account the initial electronic excitation by multiphoton absorption and the subsequent relaxation allows to quantitatively reproduce the amplitude of the measured absorption and its temporal evolution.
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Affiliation(s)
- A Bildé
- Laboratoire des Solides Irradiés, CEA-DRF-Iramis/CNRS, Ecole Polytechnique, 91128, Palaiseau, France
| | - K Redeckas
- Vilnius University, Laser Research Center, Saulėtekio al. 10, Vilnius 10223, Lithuania
| | - A Melninkaitis
- Vilnius University, Laser Research Center, Saulėtekio al. 10, Vilnius 10223, Lithuania
| | - M Vengris
- Vilnius University, Laser Research Center, Saulėtekio al. 10, Vilnius 10223, Lithuania
| | - S Guizard
- Laboratoire Interactions, Dynamiques et Lasers, CEA-DRF-IRAMIS, Université Paris-Saclay, 91191 Gif sur Yvette, France
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Du L, Yan Z, Bai X, Liang R, Phillips DL. Time-Resolved Spectroscopic Study of N,N-Di(4-bromo)nitrenium Ions in Acidic Aqueous Solution. Int J Mol Sci 2019; 20:E5512. [PMID: 31694248 DOI: 10.3390/ijms20215512] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 10/28/2019] [Accepted: 10/31/2019] [Indexed: 12/03/2022] Open
Abstract
Nitrenium ions are common reactive intermediates with high activities towards some biological nucleophiles. In this paper, we employed femtosecond transient absorption (fs-TA) and nanosecond transient absorption (ns-TA) as well as nanosecond time-resolved resonance Raman (ns-TR3) spectroscopy and density function theory (DFT) calculations to study the spectroscopic properties of the N(4,4′–dibromodiphenylamino)–2,4,6–trimethylpyridinium BF4− salt (1) in an acidic aqueous solution. Efficient cleavage of the N–N bond (4 ps) to form the N,N–di(4–bromophenyl)nitrenium ion (DN) was also observed in the acidic aqueous solution. As a result, the dication intermediate 4 appears more likely to be produced after abstracting a proton for the nitrenium ion DN in the acid solution first, followed by an electron abstraction to form the radical cation intermediate 3. These new and more extensive time-resolved spectroscopic data will be useful to help to develop an improved understanding of the identity, nature, and properties of nitrenium ions involved in reactions under acidic aqueous conditions.
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Previtali A, Lucenti E, Forni A, Mauri L, Botta C, Giannini C, Malpicci D, Marinotto D, Righetto S, Cariati E. Solid State Room Temperature Dual Phosphorescence from 3-(2-Fluoropyridin-4-yl)triimidazo[1,2- a:1',2'- c:1″,2″- e][1,3,5]triazine. Molecules 2019; 24:E2552. [PMID: 31337009 PMCID: PMC6680853 DOI: 10.3390/molecules24142552] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 07/05/2019] [Accepted: 07/12/2019] [Indexed: 11/16/2022] Open
Abstract
Organic room temperature persistent luminescence is a fascinating but still largely unexplored phenomenon. Cyclic-triimidazole and its halogenated (Br, I) derivatives have recently revealed as intriguing phosphors characterized by multifaceted emissive behavior including room temperature ultralong phosphorescence (RTUP) associated with the presence of H-aggregates in their crystal structure. Here, we move towards a multicomponent system by incorporating a fluoropyridinic fragment on the cyclic-triimidazole scaffold. Such chromophore enhances the molecular properties resulting in a high photoluminescence quantum yield (PL QY) in solution but preserves the solid-state RTUP. By means of X-ray diffraction (XRD) analysis, theoretical calculations, steady-state and time-resolved spectroscopy on solutions, polymethylmethacrylate (PMMA) blends and crystals, the nature of the different radiative deactivation channels of the compound has been disclosed. In particular, the molecular fluorescence and phosphorescence, this latter observed in frozen solution and in PMMA blends, are associated to deactivation from S1 and T1 respectively, while the low energy RTUP, observed only for crystals, is interpreted as originated from H aggregates.
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Affiliation(s)
- Andrea Previtali
- Department of Chemistry, Università degli Studi di Milano and INSTM RU, via Golgi 19, 20133 Milano, Italy
- Institute of Molecular Science and Technologies (ISTM) of CNR and INSTM RU, via Golgi 19, 20133 Milano, Italy
| | - Elena Lucenti
- Institute of Molecular Science and Technologies (ISTM) of CNR and INSTM RU, via Golgi 19, 20133 Milano, Italy
| | - Alessandra Forni
- Institute of Molecular Science and Technologies (ISTM) of CNR and INSTM RU, via Golgi 19, 20133 Milano, Italy.
| | - Luca Mauri
- Department of Chemistry, Università degli Studi di Milano and INSTM RU, via Golgi 19, 20133 Milano, Italy
| | - Chiara Botta
- Institute for Macromolecular Studies (ISMAC) of CNR, via Corti 12, 20133 Milano, Italy
| | - Clelia Giannini
- Department of Chemistry, Università degli Studi di Milano and INSTM RU, via Golgi 19, 20133 Milano, Italy
| | - Daniele Malpicci
- Department of Chemistry, Università degli Studi di Milano and INSTM RU, via Golgi 19, 20133 Milano, Italy
| | - Daniele Marinotto
- Institute of Molecular Science and Technologies (ISTM) of CNR and INSTM RU, via Golgi 19, 20133 Milano, Italy
| | - Stefania Righetto
- Department of Chemistry, Università degli Studi di Milano and INSTM RU, via Golgi 19, 20133 Milano, Italy
- Institute of Molecular Science and Technologies (ISTM) of CNR and INSTM RU, via Golgi 19, 20133 Milano, Italy
| | - Elena Cariati
- Department of Chemistry, Università degli Studi di Milano and INSTM RU, via Golgi 19, 20133 Milano, Italy.
- Institute of Molecular Science and Technologies (ISTM) of CNR and INSTM RU, via Golgi 19, 20133 Milano, Italy.
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Sinicropi A, Martin E, Ryazantsev M, Helbing J, Briand J, Sharma D, Léonard J, Haacke S, Cannizzo A, Chergui M, Zanirato V, Fusi S, Santoro F, Basosi R, Ferré N, Olivucci M. An artificial molecular switch that mimics the visual pigment and completes its photocycle in picoseconds. Proc Natl Acad Sci U S A 2008; 105:17642-7. [PMID: 19004797 PMCID: PMC2584735 DOI: 10.1073/pnas.0802376105] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Indexed: 11/18/2022] Open
Abstract
Single molecules that act as light-energy transducers (e.g., converting the energy of a photon into atomic-level mechanical motion) are examples of minimal molecular devices. Here, we focus on a molecular switch designed by merging a conformationally locked diarylidene skeleton with a retinal-like Schiff base and capable of mimicking, in solution, different aspects of the transduction of the visual pigment Rhodopsin. Complementary ab initio multiconfigurational quantum chemistry-based computations and time-resolved spectroscopy are used to follow the light-induced isomerization of the switch in methanol. The results show that, similar to rhodopsin, the isomerization occurs on a 0.3-ps time scale and is followed by <10-ps cooling and solvation. The entire (2-photon-powered) switch cycle was traced by following the evolution of its infrared spectrum. These measurements indicate that a full cycle can be completed within 20 ps.
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Affiliation(s)
- Adalgisa Sinicropi
- Dipartimento di Chimica, Università di Siena, via Aldo Moro 2, I-53100 Siena, Italy
| | - Elena Martin
- Departamento de Ingeniería Química y Química Física, Universidad de Extremadura, Avenida de Elvas s/n 06071 Badajoz, Spain
| | - Mikhail Ryazantsev
- Chemistry Department, Bowling Green State University, Bowling Green, OH 43403
| | - Jan Helbing
- Physikalisch-Chemisches Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Julien Briand
- Institut de Physique et Chimie des Matériaux de Strasbourg–Group of Nonlinear Optics, Unité Mixte de la Recherche 7504, Centre National de la Recherche Scientifique, Université Louis Pasteur, 23 Rue du Loess, 67034 Strasbourg Cédex, France
| | - Divya Sharma
- Institut de Physique et Chimie des Matériaux de Strasbourg–Group of Nonlinear Optics, Unité Mixte de la Recherche 7504, Centre National de la Recherche Scientifique, Université Louis Pasteur, 23 Rue du Loess, 67034 Strasbourg Cédex, France
| | - Jérémie Léonard
- Institut de Physique et Chimie des Matériaux de Strasbourg–Group of Nonlinear Optics, Unité Mixte de la Recherche 7504, Centre National de la Recherche Scientifique, Université Louis Pasteur, 23 Rue du Loess, 67034 Strasbourg Cédex, France
| | - Stefan Haacke
- Institut de Physique et Chimie des Matériaux de Strasbourg–Group of Nonlinear Optics, Unité Mixte de la Recherche 7504, Centre National de la Recherche Scientifique, Université Louis Pasteur, 23 Rue du Loess, 67034 Strasbourg Cédex, France
| | - Andrea Cannizzo
- Laboratoire de Spectroscopie Ultrarapide, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne-Dorigny, Switzerland
| | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne-Dorigny, Switzerland
| | - Vinicio Zanirato
- Dipartimento di Scienze Farmaceutiche, Università di Ferrara, via Fossato di Mortara 17-19, I-44100 Ferrara, Italy
| | - Stefania Fusi
- Dipartimento di Chimica, Università di Siena, via Aldo Moro 2, I-53100 Siena, Italy
| | - Fabrizio Santoro
- Istituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche, Via Moruzzi 1, I-56124 Pisa, Italy; and
| | - Riccardo Basosi
- Dipartimento di Chimica, Università di Siena, via Aldo Moro 2, I-53100 Siena, Italy
| | - Nicolas Ferré
- Laboratoire de Chimie Théorique et de Modélisation Moléculaire, Unité Mixte de la Recherche 6517, Centre National de la Recherche Scientifique Université de Provence, Case 521–Faculté de Saint-Jérôme, Av. Esc. Normandie Niemen, 13397 Marseille Cedex 20, France
| | - Massimo Olivucci
- Dipartimento di Chimica, Università di Siena, via Aldo Moro 2, I-53100 Siena, Italy
- Chemistry Department, Bowling Green State University, Bowling Green, OH 43403
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