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Dolai A, Box SM, Bhunia S, Bera S, Das A, Samanta S. Photoisomerization of 2-Arylazoimidazoles under Visible Light: Identifying a Predictive Tool to Anticipate and Tune Likely Photoswitching Performance and Cis Half-Life. J Org Chem 2023. [PMID: 37368413 DOI: 10.1021/acs.joc.3c00211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Azopyrazoles are an emerging class of photoswitches, whereas analogous azoimidazole-based switches are unable to draw much attention because of their short cis half-lives, poor cis-trans photoreversion yields, and toxic ultraviolet (UV) light-assisted isomerization. A series of 24 various aryl-substituted N-methyl-2-arylazoimidazoles were synthesized, and their photoswitching performances and cis-trans isomerization kinetics were thoroughly investigated experimentally and theoretically. Para-π-donor-substituted azoimidazoles with highly twisted T-shaped cis conformations showed nearly complete bidirectional photoswitching, whereas di-o-substituted switches exhibited very long cis half-lives (days-years) with nearly ideal T-shaped conformations. This study demonstrates how the electron density in the aryl ring affects cis half-life and cis-trans photoreversion via twisting of the NNAr dihedral angle that can be used as a predictive metric for envisaging and tuning the likely switching performance and half-life of any given 2-arylazoimidazole. By applying this tool, two better-performing azoimidazole photoswitches were engineered. All switches permitted irradiation by violet (400-405 nm) and orange (>585 nm) light for forward and reverse isomerization, respectively, and displayed comparatively high quantum yields and impressive resistance to photobleaching.
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Affiliation(s)
- Anirban Dolai
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, West Bengal, India
| | - Sk Majid Box
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, West Bengal, India
| | - Supriya Bhunia
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, West Bengal, India
| | - Satyajit Bera
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, West Bengal, India
| | - Arpan Das
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, West Bengal, India
| | - Subhas Samanta
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, West Bengal, India
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2
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Edwards KEK, Mermut O, Pietro WJ, Barrett CJ. Optical and computational study of the trans ↔ cis reversible isomerization of the commercial bis-azo dye Bismarck Brown Y. Phys Chem Chem Phys 2023; 25:5673-5684. [PMID: 36734510 DOI: 10.1039/d2cp05010b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The trans-cis-trans isomerization behaviour of Bismarck Brown Y (BBY) during and after irradiation with visible light, was characterized in detail for the first time by means of optical pump-probe experiments, to study the geometric inter-conversion of bis-azobenzene both in solution and embedded in multi-layered polymeric thin films. The rate constants observed for the thermal cis-trans back isomerization permit a determination of how the thermal isomerization is influenced by its local environment. In both solution and when incorporated into multi-layered thin films, the thermal relaxation observed for the commercial azo dye BBY showed a highly unusual biexponential decay, which clearly demonstrates two distinct isomerization processes. The cis decay showed an anomalous fast isomerization process on the timescale of milliseconds, followed by a slower isomerization process with a cis lifetime on the order of seconds. It was further observed that the faster isomerization process was influenced more by its local environment than was the slower process. The faster isomerization process also displayed a higher rate constant in aprotic solvents such as THF and DMF compared to that observed in protic solvents such as ethanol and water. Additionally, a higher rate constant was observed in solution compared to the multi-layered thin films where motion of the azo molecules was likely more restricted. Following recrystallization of the BBY azo dye, the more expected monoexponential decay was observed for the cis isomer in solution, with a single cis lifetime calculated on the timescale of seconds. This timescale corresponded well to values predicted by density functional theory calculations.
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Affiliation(s)
| | - Ozzy Mermut
- Department of Physics and Astronomy, York University, Toronto, ON, Canada
| | | | - Christopher J Barrett
- Department of Chemistry, McGill University, Montreal, QC, Canada. .,Department of Physics and Astronomy, York University, Toronto, ON, Canada
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3
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Ramírez-Rave S, Flores-Alamo M, Yatsimirsky AK. Structures, solvatochromism, protonation and photoswitching of tetra-( ortho)substituted azobenzenes bearing 3,5-dimethoxy groups. NEW J CHEM 2022. [DOI: 10.1039/d1nj05699a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Di-ortho-methoxy azobenzenes demonstrate high basicity, the ability to bind metal ions in water and an inverted solvent effect on the rate of thermal cis-to-trans isomerization, which decreases on increase in the solvent polarity.
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Affiliation(s)
- Sandra Ramírez-Rave
- Facultad de Química, Universidad Nacional Autónoma de México, 04510 CDMX, Mexico
| | - Marcos Flores-Alamo
- Facultad de Química, Universidad Nacional Autónoma de México, 04510 CDMX, Mexico
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4
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Abstract
Azobenzenes are archetypal molecules that have a central role in fundamental and applied research. Over the course of almost two centuries, the area of azobenzenes has witnessed great achievements; azobenzenes have evolved from simple dyes to 'little engines' and have become ubiquitous in many aspects of our lives, ranging from textiles, cosmetics, food and medicine to energy and photonics. Despite their long history, azobenzenes continue to arouse academic interest, while being intensively produced for industrial purposes, owing to their rich chemistry, versatile and straightforward design, robust photoswitching process and biodegradability. The development of azobenzenes has stimulated the production of new coloured and light-responsive materials with various applications, and their use continues to expand towards new high-tech applications. In this Review, we highlight the latest achievements in the synthesis of red-light-responsive azobenzenes and the emerging application areas of photopharmacology, photoswitchable adhesives and biodegradable materials for drug delivery. We show how the synthetic versatility and adaptive properties of azobenzenes continue to inspire new research directions, with limits imposed only by one's imagination.
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5
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Solid-state photoswitching in arylazopyrazole-embedded polydimethylsiloxane composite thin films. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122519] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Zhou J, Xing C, Zhai Y, Xu W, Zhao Y, Geng K, Hou H. Influence of a Substituted Methyl on the Photoresponsive Third-Order Nonlinear-Optical Properties Based on Azobenzene Metal Complexes. Inorg Chem 2021; 60:7240-7249. [PMID: 33899484 DOI: 10.1021/acs.inorgchem.1c00331] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
For studying the effect of a substituted group on the photoresponsive third-order nonlinear-optical (NLO) properties, photosensitive azobenzene derivative H2L1 was first selected to construct metal complexes {[Zn2(L1)2(H2O)3]·2DMA)}n (1) and {[Cd(L1)(4,4'-bpy)H2O]·H2O}n (2). Then H2L2 with a substituted methyl on the azobenzene ring was used to construct complexes {[Zn(L2)(4,4'-bpy)(H2O)]}n (3) and {[Cd(L2)(4,4'-bpy)(H2O)]}n (4). When the azobenzene moiety of the complexes is trans, the NLO behaviors of the complexes are the same. However, after the azobenzene moiety is excited by ultraviolet (UV) light to change from trans to cis, the substituted methyl increases the repulsion between two azobenzene rings in 3 and 4, thereby affecting their NLO behaviors. Therefore, the nonlinearity of the two types of complexes is different after UV irradiation. Density functional theory calculations support this result. The substituted methyl has a significant influence on the nonlinear absorption behaviors of 3 and 4. This work not only reports the examples of photoresponsive NLO materials based on metal complexes but also provides a new idea to deeply explore NLO properties.
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Affiliation(s)
- Jiachao Zhou
- College of Chemistry and Green Catalysis Center, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Chang Xing
- College of Chemistry and Green Catalysis Center, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Yali Zhai
- College of Chemistry and Green Catalysis Center, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Wenjuan Xu
- College of Chemistry and Green Catalysis Center, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Yujie Zhao
- College of Chemistry and Green Catalysis Center, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Kangshuai Geng
- College of Chemistry and Green Catalysis Center, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Hongwei Hou
- College of Chemistry and Green Catalysis Center, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
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7
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Panigrahi S, Biswal SP, Misra PK. Disclosure of the solvatochromism and the reversal switch in some tailor-made electron push-push anils. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Creary X. The Nature of Azo-Substituted Carbocations: N-N π-Electron Stabilization versus Nitrogen Nonbonding Electron Stabilization. J Org Chem 2021; 87:2241-2254. [PMID: 33720719 DOI: 10.1021/acs.joc.1c00140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Computational and experimental studies reveal two different modes of cation stabilization by the phenylazo group. The first mode involves a relatively weak conjugative interaction with the azo π-bond, while the second mode involves an interaction with the nitrogen nonbonding electrons. The 4-phenylazo group is slightly rate-retarding in the solvolysis of cumyl chloride and benzyl mesylate derivatives but rate-enhancing in the solvolysis of α-CF3 benzylic analogs. The phenylazo group can become a potent electron-donating group in cations such as [Me2C-N═N-Ph]+. Nonbonding electron stabilization can be strong enough to offset the very powerful γ-silyl stabilization. In aromatic cyclopropenium and tropylium cations, the demand for stabilization is quite low, and the mode of phenylazo stabilization reverts back to the less-effective π-stabilization. The solvolysis of cis-4-phenylazo benzyl mesylate is faster than that of trans-4-phenylazo benzyl mesylate. Products formed suggest a stepwise ionization, cation isomerization, and nucleophile capture mechanism. Computational studies indicate a vanishingly small barrier for the isomerization of the cis-cation intermediate to the trans-cation.
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Affiliation(s)
- Xavier Creary
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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9
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Rincón-Londoño N, Garza C, Esturau-Escofet N, Kozina A, Castillo R. Selective incorporation of one of the isomers of a photoswitchable molecule in wormlike micelles. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Constantin CP, Sava I, Damaceanu MD. Structural Chemistry-Assisted Strategy toward Fast Cis–Trans Photo/Thermal Isomerization Switch of Novel Azo-Naphthalene-Based Polyimides. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02182] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Catalin-Paul Constantin
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania
| | - Ion Sava
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania
| | - Mariana-Dana Damaceanu
- “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania
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11
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Quintano V, Diez-Cabanes V, Dell’Elce S, Di Mario L, Pelli Cresi S, Paladini A, Beljonne D, Liscio A, Palermo V. Measurement of the conformational switching of azobenzenes from the macro- to attomolar scale in self-assembled 2D and 3D nanostructures. Phys Chem Chem Phys 2021; 23:11698-11708. [DOI: 10.1039/d1cp00740h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We compare the cis–trans conformational switching of commercial azobenzene molecules in different chemical environments, ranging from isolated molecules in liquid to attomolar-2D and macro-scale 3D self-assembled structures.
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Affiliation(s)
- Vanesa Quintano
- Institute of Organic Synthesis and Photoreactivity (ISOF) – (CNR)
- 40129 Bologna
- Italy
| | | | | | - Lorenzo Di Mario
- Division of Ultrafast Processes in Materials (FLASHit)
- Institute of Structure of Matter (ISM) – CNR
- 00133 Rome
- Italy
| | - Stefano Pelli Cresi
- Division of Ultrafast Processes in Materials (FLASHit)
- Institute of Structure of Matter (ISM) – CNR
- 00133 Rome
- Italy
| | - Alessandra Paladini
- Division of Ultrafast Processes in Materials (FLASHit)
- Institute of Structure of Matter (ISM) – CNR
- 00133 Rome
- Italy
| | - David Beljonne
- Laboratory for Chemistry of Novel Materials
- University of Mons
- B-7000 Mons
- Belgium
| | - Andrea Liscio
- Institute for Microelectronics and Microsystems (IMM)
- National Research Council of Italy (CNR)
- 00133 Rome
- Italy
| | - Vincenzo Palermo
- Institute of Organic Synthesis and Photoreactivity (ISOF) – (CNR)
- 40129 Bologna
- Italy
- Department of Industrial and Materials Science
- Chalmers University of Technology
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12
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Sheng K, Liu YN, Gupta RK, Kurmoo M, Sun D. Arylazopyrazole-functionalized photoswitchable octanuclear Zn(II)-silsesquioxane nanocage. Sci China Chem 2020. [DOI: 10.1007/s11426-020-9886-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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13
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Fu W, Alam TM, Li J, Bustamante J, Lien T, Adams RW, Teat SJ, Stokes BJ, Yang W, Liu Y, Lu JQ. Arene Substitution Design for Controlled Conformational Changes of Dibenzocycloocta-1,5-dienes. J Am Chem Soc 2020; 142:16651-16660. [PMID: 32881488 DOI: 10.1021/jacs.0c06579] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report that an agile eight-membered cycloalkane can be stabilized by fusing a benzene ring on each side, substituted with proper functional groups. The conformational change of dibenzocycloocta-1,5-diene (DBCOD), a rigid-flexible-rigid organic moiety, from its Boat to Chair conformation requires an activation energy of 42 kJ/mol, which is substantially lower than those of existing submolecular shape-changing units. Experimental data corroborated by theoretical calculations demonstrate that intramolecular hydrogen bonding can stabilize Boat, whereas electron repulsive interaction from opposing ester substituents favors Chair. Intramolecular hydrogen bonding formed by 1,10-diamide substitution stabilizes Boat, spiking the temperature at which Boat and Chair can readily interchange from -60 to 60 °C. Concomitantly this intramolecular attraction raises the energy barrier from 42 kJ/mol for unsubstituted DBCOD to 68 kJ/mol for diamide-substituted DBCOD. Remarkably, this value falls within the range of the activation energy of highly efficient enzyme-catalyzed biological reactions. With shape changes once considered only possible with high energy, our work reveals a potential pathway exemplified by a specific submolecular structure to achieve low-energy-driven shape changes for the first time. The intrinsic cycle stability and high-energy output systems that would incur damage under high-energy stimuli could particularly benefit from this new kind of low-energy-driven shape-changing mechanism. This work has laid the basis to construct systems for low-energy-driven stimuli-responsive applications, hitherto a challenge to overcome.
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Affiliation(s)
- Wenxin Fu
- Materials Science and Engineering, School of Engineering, University of California, Merced, 5200 North Lake Road, Merced, California 95343, United States
| | - Todd M Alam
- Department of Organic Material Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Jiachen Li
- Department of Chemistry and Department of Physics, Duke University, Durham, North Carolina 27708, United States
| | - Jacqueline Bustamante
- Materials Science and Engineering, School of Engineering, University of California, Merced, 5200 North Lake Road, Merced, California 95343, United States
| | - Thanh Lien
- Department of Chemistry and Chemical Biology, University of California, Merced, 5200 North Lake Road, Merced, California 95343, United States
| | - Ralph W Adams
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Simon J Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Benjamin J Stokes
- Department of Chemistry and Chemical Biology, University of California, Merced, 5200 North Lake Road, Merced, California 95343, United States
| | - Weitao Yang
- Department of Chemistry and Department of Physics, Duke University, Durham, North Carolina 27708, United States
| | - Yi Liu
- The Molecular Foundry, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States
| | - Jennifer Q Lu
- Materials Science and Engineering, School of Engineering, University of California, Merced, 5200 North Lake Road, Merced, California 95343, United States
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14
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Suzuki Y, Ikeda A, Ohno K, Fujihara T, Sugaya T, Ishihara K. o-Azophenylboronic Acid-Based Colorimetric Sensors for d-Fructose: o-Azophenylboronic Acids with Inserted Protic Solvent Are the Key Species for a Large Color Change. J Org Chem 2020; 85:9680-9693. [PMID: 32639160 DOI: 10.1021/acs.joc.0c01011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Many boronic acid-based chemosensors for saccharides have been developed; however, their detection mechanisms have seldom been studied. In this study, we synthesized 10 o-azophenylboronic acid derivatives (azoBs) and conducted a fundamental study on the reactivity and the sensing mechanism of azoBs, which undergoes a large color change, e.g., from red to yellow, upon a reaction with saccharides. Their pH-independent formation constants were determined by spectrophotometric titration and then converted to the conditional formation constant K' at pH 7.4. A linear free energy relationship was established between log K' and the pKa of azoB. 11B NMR measurements indicate that in aprotic solvents, azoB forms a trigonal planar structure, while in protic solvents, it forms a quasi-tetrahedral structure (azoB-ROH) with a protic solvent molecule (ROH) inserted between the boronic acid moiety and the azo group. In addition, UV-vis spectroscopic studies showed that the color change during the reaction between azoB and d-fructose in ROH was caused by the release of the ROH from azoB-ROH by d-fructose. Based on the findings in this study, we proposed a guideline for designing an azoB-based chemosensor that exhibits high reactivity toward saccharides and a sufficient color change to allow for the visual detection of saccharides.
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Affiliation(s)
- Yota Suzuki
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Ayumi Ikeda
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Keiji Ohno
- Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-Okubo 255, Sakura-ku, Saitama 338-8570, Japan
| | - Takashi Fujihara
- Comprehensive Analysis Center for Science, Saitama University, Shimo-Okubo 255, Sakura-ku, Saitama 338-8570, Japan
| | - Tomoaki Sugaya
- Education Center, Faculty of Engineering, Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan
| | - Koji Ishihara
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
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15
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Mikheev YA, Ershov YA. Mechanism of the Laser Flash Photolysis of Rydimeric e-Tautomers of 4-N,N-Diethylaminoazobenzene in a 2-Propanol Medium. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2020. [DOI: 10.1134/s0036024420010227] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Arai H, Wada A. Investigation of photo- and thermal isomerization pathways of azobenzene derivative in photostationary state generated by two-color excitation. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Chenxi Y, Juan L, Jian W, Zhen G, Huanyuan W, Chendi S, Dongwen H, Ling L. Dip-coated rapeseed meal composite as a green carrier for light-induced controlled release of pesticide. NEW J CHEM 2020. [DOI: 10.1039/d0nj02771e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
4-Aminoazobenzene moieties act as light-driven “stirrers” to stimulate the release of pesticide.
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Affiliation(s)
- Yang Chenxi
- ShaanXi Provincial Land Engineering Construction Group Co., Ltd
- Xi'an 710075
- China
- Institute of Land Engineering and Technology
- Shaanxi Provincial Land Engineering Construction Group Co., Ltd
| | - Li Juan
- ShaanXi Provincial Land Engineering Construction Group Co., Ltd
- Xi'an 710075
- China
- Institute of Land Engineering and Technology
- Shaanxi Provincial Land Engineering Construction Group Co., Ltd
| | - Wang Jian
- ShaanXi Provincial Land Engineering Construction Group Co., Ltd
- Xi'an 710075
- China
- Institute of Land Engineering and Technology
- Shaanxi Provincial Land Engineering Construction Group Co., Ltd
| | - Guo Zhen
- ShaanXi Provincial Land Engineering Construction Group Co., Ltd
- Xi'an 710075
- China
- Institute of Land Engineering and Technology
- Shaanxi Provincial Land Engineering Construction Group Co., Ltd
| | - Wang Huanyuan
- ShaanXi Provincial Land Engineering Construction Group Co., Ltd
- Xi'an 710075
- China
- Institute of Land Engineering and Technology
- Shaanxi Provincial Land Engineering Construction Group Co., Ltd
| | - Shi Chendi
- ShaanXi Provincial Land Engineering Construction Group Co., Ltd
- Xi'an 710075
- China
- Institute of Land Engineering and Technology
- Shaanxi Provincial Land Engineering Construction Group Co., Ltd
| | - Hua Dongwen
- Shaanxi Key Laboratory of Land Consolidation
- Xi'an 710021
- China
| | - Li Ling
- College of Land Engineering
- Chang'an University
- Xi'an 710021
- China
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18
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Ye Y, Gao L, Hao H, Yin Q, Xie C. Tuning the photomechanical behavior and excellent elasticity of azobenzene via cocrystal engineering. CrystEngComm 2020. [DOI: 10.1039/d0ce01394c] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Obtaining crystals with different photomechanical responses and excellent mechanical properties simultaneously through cocrystal engineering based on the same photoactive molecule.
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Affiliation(s)
- Yang Ye
- School of Chemical Engineering and Technology
- State Key Laboratory of Chemical Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Lei Gao
- School of Chemical Engineering and Technology
- State Key Laboratory of Chemical Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Hongxun Hao
- School of Chemical Engineering and Technology
- State Key Laboratory of Chemical Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Qiuxiang Yin
- School of Chemical Engineering and Technology
- State Key Laboratory of Chemical Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Chuang Xie
- School of Chemical Engineering and Technology
- State Key Laboratory of Chemical Engineering
- Tianjin University
- Tianjin 300072
- China
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19
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Phapale D, Kushwaha A, Das D. Room Temperature Reversible Z
→ E
Photoisomerization of Azobenzene Appended to Anthraquinone-Benzimidazole Based Photoswitches with Resolved n→π* Absorption Band. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900930] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Daulat Phapale
- Department of Chemistry; Institute of Chemical Technology; 400019 Matunga, Mumbai India
| | - Archana Kushwaha
- Department of Chemistry; Institute of Chemical Technology; 400019 Matunga, Mumbai India
| | - Dipanwita Das
- Department of Chemistry; Institute of Chemical Technology; 400019 Matunga, Mumbai India
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20
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Dolgopolov AV, Grafskaia KN, Bovsunovskaya PV, Melnikova ER, Ivanov DA, Pich A, Zhu X, Möller M. Aqueous microgels modified with photosensitive wedge-shaped amphiphilic molecules: synthesis, structure and photochemical behaviour. Photochem Photobiol Sci 2019; 18:1709-1715. [PMID: 31063533 DOI: 10.1039/c9pp00044e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Aqueous microgels based on poly(N-vinylcaprolactam) with reversible temperature-induced volume transition are promising "smart" materials for various applications. In this work, the microgels are modified via acid-base interaction by wedge-shaped amphiphilic sulfonic acid molecules with alkyl chains of different lengths and an azobenzene group. In contrast to the pristine microgel the modified microgels retain colloidal stability in water and show different responses to the change of temperature and pH. The azobenzene group in the ligand molecules acts as a spectroscopic and kinetic probe sensing the microenvironment inside the microgel particles. Thus, the observed hyperchromicity upon heating suggests the enhancement of hydrophobicity with the increase of temperature. The hydrophobicity of the microgel interior increases with the increase of the modification degree as indicated by the increase of activation energy of the thermal Z/E isomerization of the azobenzene group.
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Affiliation(s)
- Andrey V Dolgopolov
- DWI - Leibniz Institute for Interactive Materials e.V. and Institute for Technical and Macromolecular Chemistry of RWTH Aachen University, Forkenbeckstr. 50, D-52056 Aachen, Germany.
| | - Kseniia N Grafskaia
- Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation and Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russian Federation
| | - Polina V Bovsunovskaya
- Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation and Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russian Federation
| | - Elina R Melnikova
- Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation and Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russian Federation
| | - Dimitri A Ivanov
- Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation and Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russian Federation and Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991 Moscow, Russian Federation and Institut de Science de Matériaux de Mulhouse (IS2M, CNRS UMR 7361), 15 rue Jean Starcky, F-68057 Mulhouse, France
| | - Andrij Pich
- DWI - Leibniz Institute for Interactive Materials e.V. and Institute for Technical and Macromolecular Chemistry of RWTH Aachen University, Forkenbeckstr. 50, D-52056 Aachen, Germany.
| | - Xiaomin Zhu
- DWI - Leibniz Institute for Interactive Materials e.V. and Institute for Technical and Macromolecular Chemistry of RWTH Aachen University, Forkenbeckstr. 50, D-52056 Aachen, Germany.
| | - Martin Möller
- DWI - Leibniz Institute for Interactive Materials e.V. and Institute for Technical and Macromolecular Chemistry of RWTH Aachen University, Forkenbeckstr. 50, D-52056 Aachen, Germany.
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21
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Mikheev YA, Ershov YA. Photochemical Reactions of Aminoazobenzene in Solutions, According to Ultrafast Vis Spectroscopy Data. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2019. [DOI: 10.1134/s0036024419060220] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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22
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Mikheev YA, Ershov YA. Acid–Base Forms of Dimethylaminoazobenzene Derivatives, According to UV–Vis Spectroscopic Data. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2018. [DOI: 10.1134/s0036024418100205] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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23
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Devi S, Saraswat M, Grewal S, Venkataramani S. Evaluation of Substituent Effect in Z-Isomer Stability of Arylazo-1H-3,5-dimethylpyrazoles: Interplay of Steric, Electronic Effects and Hydrogen Bonding. J Org Chem 2018; 83:4307-4322. [DOI: 10.1021/acs.joc.7b02604] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Sudha Devi
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, Knowledge City, S.A.S.Nagar, Manauli, 140306 Punjab, India
| | - Mayank Saraswat
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, Knowledge City, S.A.S.Nagar, Manauli, 140306 Punjab, India
| | - Surbhi Grewal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, Knowledge City, S.A.S.Nagar, Manauli, 140306 Punjab, India
| | - Sugumar Venkataramani
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, Knowledge City, S.A.S.Nagar, Manauli, 140306 Punjab, India
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24
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Zhao D, Qiu Y, Cheng W, Bi S, Wang H, Wang Q, Liao Y, Peng H, Xie X. Precisely Tuning Helical Twisting Power via Photoisomerization Kinetics of Dopants in Chiral Nematic Liquid Crystals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:700-708. [PMID: 29268613 DOI: 10.1021/acs.langmuir.7b03786] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
It has been paid much attention to improve the helical twisting power (β) of dopants in chiral nematic liquid crystals (CLCs); however, the correlations between the β value and the molecular structures as well as the interaction with nematic LCs are far from clear. In this work, a series of reversibly photo-switchable axially chiral dopants with different lengths of alkyl or alkoxyl substituent groups have been successfully synthesized through nucleophilic substitution and the thiol-ene click reaction. Then, the effect of miscibility between these dopants and nematic LCs on the β values, as well as the time-dependent decay/growth of the β values upon irradiations, has been investigated. The theoretical Teas solubility parameter shows that the miscibility between dopants and nematic LCs decreases with increasing of the length of substituent groups from dopant 1 to dopant 4. The β value of chiral dopants in nematic LCs decreases from dopant 1 to dopant 4 both at the visible light photostationary state (PSS) and at the UV PSS after UV irradiation. With increasing of the length of substituent groups, the photoisomerization rate constant of dopants increases for trans-cis transformation upon UV irradiation and decreases for the reverse process upon visible light irradiation either in isotropic ethyl acetate or in anisotropic LCs, although the constant in ethyl acetate is several times larger than the corresponding value in LCs. Also, the color of the CLCs could be tuned upon light irradiations. These results enable the precise tuning of the pitch and selective reflection wavelength/color of CLCs, which paves the way to the applications in electro-optic devices, information storage, high-tech anticounterfeit, and so forth.
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Affiliation(s)
| | | | | | - Shuguang Bi
- Hubei Biomass Fibers and Eco-dyeing & Finishing Key Laboratory, College of Chemistry and Chemical Engineering, State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University , Wuhan 430073, China
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25
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Zhou L, Chen L, Ren G, Zhu Z, Zhao H, Wang H, Zhang W, Han J. Monitoring cis-to-trans isomerization of azobenzene using terahertz time-domain spectroscopy. Phys Chem Chem Phys 2018; 20:27205-27213. [DOI: 10.1039/c8cp04570d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We present terahertz time-domain spectroscopy (THz-TDS) to explore the conformational dynamics of thermally induced and photoinduced isomerization of azobenzene.
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Affiliation(s)
- Lu Zhou
- Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Ligang Chen
- Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Guanhua Ren
- Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering
- Tianjin University
- Tianjin 300072
- China
| | - Zhongjie Zhu
- Shanghai Institute of Applied Physics
- Chinese Academy of Sciences
- Shanghai 201800
- P. R. China
| | - Hongwei Zhao
- Shanghai Institute of Applied Physics
- Chinese Academy of Sciences
- Shanghai 201800
- P. R. China
| | - Huabin Wang
- Chongqing Engineering Research Center of High-Resolution and Three-Dimensional Dynamic Imaging Technology
- Chongqing Institute of Green and Intelligent Technology
- Chinese Academy of Science
- Chongqing 400714
- China
| | - Weili Zhang
- Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering
- Tianjin University
- Tianjin 300072
- China
- School of Electrical and Computer Engineering
| | - Jiaguang Han
- Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering
- Tianjin University
- Tianjin 300072
- China
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26
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Nasaruddin RR, Chen T, Li J, Goswami N, Zhang J, Yan N, Xie J. Ligands Modulate Reaction Pathway in the Hydrogenation of 4-Nitrophenol Catalyzed by Gold Nanoclusters. ChemCatChem 2017. [DOI: 10.1002/cctc.201701472] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Ricca Rahman Nasaruddin
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Tiankai Chen
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Jingguo Li
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Nirmal Goswami
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Jiaguang Zhang
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Ning Yan
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Jianping Xie
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
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27
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Yano A, Konno Y, Kinoshita E, Yano R. Concentration dependence of thermal isomerization process of methyl orange in ethanol. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.06.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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28
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Ghebreyessus K, Cooper SM. Photoswitchable Arylazopyrazole-Based Ruthenium(II) Arene Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00493] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Kesete Ghebreyessus
- Department of Chemistry and
Biochemistry, Hampton University, Hampton, Virginia 23668, United States
| | - Stefan M. Cooper
- Department of Chemistry and
Biochemistry, Hampton University, Hampton, Virginia 23668, United States
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29
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Scholz MS, Bull JN, Coughlan NJA, Carrascosa E, Adamson BD, Bieske EJ. Photoisomerization of Protonated Azobenzenes in the Gas Phase. J Phys Chem A 2017; 121:6413-6419. [DOI: 10.1021/acs.jpca.7b05902] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - James N. Bull
- School
of Chemistry, University of Melbourne, Melbourne, Australia
| | - Neville J. A. Coughlan
- School
of Chemistry, University of Melbourne, Melbourne, Australia
- Department
of Chemistry, University of Oxford, Oxford, United Kingdom
| | | | - Brian D. Adamson
- School
of Chemistry, University of Melbourne, Melbourne, Australia
- Sandia National Laboratories, Livermore, California 94551, United States
| | - Evan J. Bieske
- School
of Chemistry, University of Melbourne, Melbourne, Australia
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30
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Angelini G, Campestre C, Scotti L, Gasbarri C. Kinetics and Energetics of Thermal Cis-Trans Isomerization of a Resonance-Activated Azobenzene in BMIM-Based Ionic Liquids for PF₆ -/Tf₂N - Comparison. Molecules 2017; 22:E1273. [PMID: 28758922 PMCID: PMC6152290 DOI: 10.3390/molecules22081273] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 07/27/2017] [Accepted: 07/27/2017] [Indexed: 02/05/2023] Open
Abstract
BMIM PF₆ (1-butyl-3-methylimidazolium hexafluorophosphate) and BMIM Tf₂N (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) are two conventional room-temperature ionic liquids widely employed and investigated as reaction media. Despite the presence of the same imidazolium ring in their structure they are different in many chemical and physical properties due to the nature of the anions. The thermal cis-trans isomerization of an electronically activated azobenzene have been used as reaction model to compare the behavior of PF₆- and Tf₂N-. Rotation is the mechanism by which the investigated azobenzene is converted into the trans isomer spontaneously in the dark both in BMIM PF₆ and in BMIM Tf₂N. The kinetic rate constants of the process have been determined at different temperatures and the activation energies of the reaction have been calculated according to the Arrhenius and Eyring equations. The results presented herein highlight different solute-solvent interactions involving the PF₆- and Tf₂N- anions during the cis-trans isomerization.
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Affiliation(s)
- Guido Angelini
- Department of Pharmacy, University "G. d'Annunzio" of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Cristina Campestre
- Department of Pharmacy, University "G. d'Annunzio" of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Luca Scotti
- Department of Oral Science, Nano and Biotechnology, University "G. d'Annunzio" of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
| | - Carla Gasbarri
- Department of Pharmacy, University "G. d'Annunzio" of Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy.
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31
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Mikheev YA, Guseva LN, Ershov YA. UV–Vis spectra and structure of acid-base forms of dimethylamino- and aminoazobenzene. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2017. [DOI: 10.1134/s0036024417040161] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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32
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Lee TL, Lo CT. Photoresponsive and fluorescence behaviors of azobenzene-containing amphiphilic block copolymers. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/polb.24323] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ting-Lei Lee
- Department of Chemical Engineering; National Cheng Kung University; No. 1, University Road Tainan City Taiwan 701
| | - Chieh-Tsung Lo
- Department of Chemical Engineering; National Cheng Kung University; No. 1, University Road Tainan City Taiwan 701
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33
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Two-dimensional observation of multicolor multistep photoreaction process by using white light excitation covering entire visible region. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Angelini G, Canilho N, Emo M, Kingsley M, Gasbarri C. Role of Solvent and Effect of Substituent on Azobenzene Isomerization by Using Room-Temperature Ionic Liquids as Reaction Media. J Org Chem 2015; 80:7430-4. [DOI: 10.1021/acs.joc.5b00898] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Guido Angelini
- Dipartimento
di Farmacia, Università “G. d’Annunzio” di Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy
| | - Nadia Canilho
- Université de Lorraine, SRSMC, UMR7565, Vandœuvre-lès-Nancy F-54506 Cedex, France
| | - Mélanie Emo
- Institut
J. Barriol, FR 2843, CNRS, Université de Lorraine, BP 70239, Vandœuvre-lès-Nancy F-54506 Cedex, France
| | - Molly Kingsley
- University of Colorado Denver, Anschutz
Medical Campus, 13001 East 17th Place, Aurora, Colorado 80045, United States
| | - Carla Gasbarri
- Dipartimento
di Farmacia, Università “G. d’Annunzio” di Chieti-Pescara, via dei Vestini, 66100 Chieti, Italy
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35
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Tang H, Lu D, Wu C. Intramolecular Hydrogen Bonds Enhance Disparity in Reactivity between Isomers of Photoswitchable Sorbents and CO2 : A Computational Study. Chemphyschem 2015; 16:1926-32. [PMID: 25908484 DOI: 10.1002/cphc.201500164] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 04/02/2015] [Indexed: 11/07/2022]
Abstract
Reducing the emission of greenhouse gases, such as CO2 , requires efficient and reusable capture materials. The energy for regenerating sorbents is critical to the cost of CO2 capture. Here, we design a series of photoswitchable CO2 capture molecules by grafting Lewis bases, which can covalently bond CO2 , to azo-based backbones that can switch configurations upon light stimulation. The first-principles calculations demonstrate that intramolecular hydrogen bonds are crucial for enlarging the difference of CO2 binding strengths to the cis and trans isomers. As a result, the CO2 -sorbent interaction can be light-adjusted from strong chemical bonding in one configuration to weak bonding in the other, which may lead to a great energy reduction in sorbent regeneration.
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Affiliation(s)
- Huarong Tang
- School of Materials Science and Engineering, Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University (China)
| | - Dongmei Lu
- Department of Applied chemistry, School of Science, Xi'an Jiaotong University (China).
| | - Chao Wu
- Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710054 (China).
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36
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Weston CE, Richardson RD, Haycock PR, White AJP, Fuchter MJ. Arylazopyrazoles: azoheteroarene photoswitches offering quantitative isomerization and long thermal half-lives. J Am Chem Soc 2014; 136:11878-81. [PMID: 25099917 DOI: 10.1021/ja505444d] [Citation(s) in RCA: 252] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Arylazopyrazoles, a novel class of five-membered azo photoswitches, offer quantitative photoswitching and high thermal stability of the Z isomer (half-lives of 10 and ∼1000 days). The conformation of the Z isomers of these compounds, and also the arylazopyrroles, is highly dependent on the substitution pattern on the heteroarene, allowing a twisted or planar geometry, which in turn has a significant impact on the electronic spectral properties of the compounds.
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Affiliation(s)
- Claire E Weston
- Department of Chemistry, Imperial College London , London SW7 2AZ, United Kingdom
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37
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Couto RM, Lourenço C, Simões PC, Branco LC. Task specific ionic liquids as polarity shifting additives of common organic solvents. NEW J CHEM 2014. [DOI: 10.1039/c4nj00781f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The effect of the addition of RTILs to tetrahydrofuran, chloroform, acetonitrile, isopropanol and ethanol on ENT values.
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Affiliation(s)
- Ricardo M. Couto
- Departamento de Química
- REQUIMTE-CQFB
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa
- 2829-516 Caparica, Portugal
| | - Catarina Lourenço
- Departamento de Química
- REQUIMTE-CQFB
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa
- 2829-516 Caparica, Portugal
| | - Pedro C. Simões
- Departamento de Química
- REQUIMTE-CQFB
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa
- 2829-516 Caparica, Portugal
| | - Luís C. Branco
- Departamento de Química
- REQUIMTE-CQFB
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa
- 2829-516 Caparica, Portugal
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