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Dobre AF, Hanganu A, Nicolau I, Popescu CC, Paun A, Mădălan AM, Tablet C, Mirea AG, Matache M. A Synthetic Approach for Oxadiazole-Decorated Azobenzene Photoswitches. Chempluschem 2024; 89:e202300504. [PMID: 37882979 DOI: 10.1002/cplu.202300504] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/24/2023] [Accepted: 10/24/2023] [Indexed: 10/27/2023]
Abstract
This work reports the design and synthesis of novel oxadiazole-decorated azobenzenes, structural analysis of the resulting compounds and behavior under light irradiation. The synthetic strategy involved constructing amino functionalized heterocyclic key intermediates which were used either to yield electrophilic diazonium salts able to react with phenol moieties or as nucleophilic partners in Bayer-Mills reaction with nitroso-substituted derivatives. The amino-derived oxadiazole intermediates were investigated by absorption and emission spectroscopy providing blue and green emitted light. The target oxadiazole-decorated azobenzenes were structurally characterized, including solid-state structures, and subsequently used in irradiation experiments in order to take advantage of the azo group known to provide photoswitching abilities. We noticed quenching of the emissive properties in presence of the azo group; however, all compounds were very stable to repeated cycles of light irradiation. In addition, according to structural diversification we could obtain half-lives of the meta stable isomers within hours to hundreds of hours range. The experimental results were very well correlated with DFT calculations.
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Affiliation(s)
- Adela F Dobre
- Faculty of Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
- Research Centre of Applied Organic Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
| | - Anamaria Hanganu
- Research Centre of Applied Organic Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
- "C. D. Nenitzescu" Institute of Organic and Supramolecular Chemistry of the Romanian Academy, 202B Spl. Independenţei, 060023, Bucharest, Romania
| | - Ioana Nicolau
- Faculty of Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
- Research Centre of Applied Organic Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
| | - Codruta C Popescu
- Faculty of Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
- Research Centre of Applied Organic Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
| | - Anca Paun
- Faculty of Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
- Research Centre of Applied Organic Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
| | - Augustin M Mădălan
- Faculty of Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
| | - Cristina Tablet
- Faculty of Pharmacy, Titu Maiorescu University, Gh. Sincai Bd. 16, 040317, Bucharest, Romania
| | - Anca G Mirea
- National Institute of Material Physics, 405 A Atomistilor Street, 077125, Magurele, Romania
| | - Mihaela Matache
- Faculty of Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
- Research Centre of Applied Organic Chemistry, University of Bucharest, 90 Panduri Street, 050663, Bucharest, Romania
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Hu Y, Picher M, Palluel M, Daro N, Freysz E, Stoleriu L, Enachescu C, Chastanet G, Banhart F. Laser-Driven Transient Phase Oscillations in Individual Spin Crossover Particles. Small 2023; 19:e2303701. [PMID: 37246252 DOI: 10.1002/smll.202303701] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Indexed: 05/30/2023]
Abstract
An unusual expansion dynamics of individual spin crossover nanoparticles is studied by ultrafast transmission electron microscopy. After exposure to nanosecond laser pulses, the particles exhibit considerable length oscillations during and after their expansion. The vibration period of 50-100 ns is of the same order of magnitude as the time that the particles need for a transition from the low-spin to the high-spin state. The observations are explained in Monte Carlo calculations using a model where elastic and thermal coupling between the molecules within a crystalline spin crossover particle govern the phase transition between the two spin states. The experimentally observed length oscillations are in agreement with the calculations, and it is shown that the system undergoes repeated transitions between the two spin states until relaxation in the high-spin state occurs due to energy dissipation. Spin crossover particles are therefore a unique system where a resonant transition between two phases occurs in a phase transformation of first order.
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Affiliation(s)
- Yaowei Hu
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
| | - Matthieu Picher
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
| | - Marlène Palluel
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Nathalie Daro
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Eric Freysz
- Université de Bordeaux, CNRS UMR 5798, LOMA, Talence cedex, 33405, France
| | - Laurentiu Stoleriu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Cristian Enachescu
- Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
| | - Guillaume Chastanet
- Université de Bordeaux, CNRS, Bordeaux INP (ICMCB-UMR 5026), Pessac, 33600, France
| | - Florian Banhart
- Institut de Physique et Chimie des Matériaux UMR 7504, Université de Strasbourg & CNRS, Strasbourg, 67034, France
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