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Luu K, Park SY. Shape-Persistent Liquid Crystal Elastomers with Cis-Stable Crosslinkers Containing Ortho-Methyl-Substituted Azobenzene. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- Khuong Luu
- School of Applied Chemical Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Soo-Young Park
- School of Applied Chemical Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, Daegu 41566, Republic of Korea
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2
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Han M, Moe K. Light-Responsive Hexagonal Assemblies of Triangular Azo Dyes. Molecules 2022; 27:4380. [PMID: 35889253 PMCID: PMC9317042 DOI: 10.3390/molecules27144380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 07/05/2022] [Accepted: 07/05/2022] [Indexed: 12/01/2022] Open
Abstract
The rational design of small building block molecules and understanding their molecular assemblies are of fundamental importance in creating new stimuli-responsive organic architectures with desired shapes and functions. Based on the experimental results of light-induced conformational changes of four types of triangular azo dyes with different terminal functional groups, as well as absorption and fluorescence characteristics associated with their molecular assemblies, we report that aggregation-active emission enhancement (AIEE)-active compound (1) substituted with sterically crowded tert-butyl (t-Bu) groups showed approximately 35% light-induced molecular switching and had a strong tendency to assemble into highly stable hexagonal structures with AIEE characteristics. Their sizes were regulated from nanometer-scale hexagonal rods to micrometer-scale sticks depending on the concentration. This is in contrast to other triangular compounds with bromo (Br) and triphenylamine (TPA) substituents, which exhibited no photoisomerization and tended to form flexible fibrous structures. Moreover, non-contact exposure of the fluorescent hexagonal nanorods to ultraviolet (UV) light led to a dramatic hexagonal-to-amorphous structure transition. The resulting remarkable variations, such as in the contrast of microscopic images and fluorescence characteristics, were confirmed by various microscopic and spectroscopic measurements.
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Affiliation(s)
- Mina Han
- Department of Chemistry Education, Kongju National University, Gongju 32588, Korea;
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3
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Solvent- and Light-Sensitive AIEE-Active Azo Dye: From Spherical to 1D and 2D Assemblies. Int J Mol Sci 2022; 23:ijms23020965. [PMID: 35055154 PMCID: PMC8778914 DOI: 10.3390/ijms23020965] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/07/2022] [Accepted: 01/14/2022] [Indexed: 02/01/2023] Open
Abstract
Fluorescent molecular assembly systems provide an exciting platform for creating stimuli-responsive nano- and microstructured materials with optical, electronic, and sensing functions. To understand the relationship between (i) the plausible molecular structures preferentially adopted depending on the solvent polarity (such as N,N-dimethylformamide [DMF], tetrahydrofuran [THF], and toluene), (ii) the resulting spectroscopic features, and (iii) self-assembled nano-, micro-, and macrostructures, we chose a sterically crowded triangular azo dye (3Bu) composed of a polar molecular core and three peripheral biphenyl wings. The chromophore changed the solution color from yellow to pink-red depending on the solvent polarity. In a yellow DMF solution, a considerable amount of the twisted azo form could be kept stable with the help of favorable intermolecular interactions with the solvent molecules. By varying the concentration of the DMF solution, the morphology of self-assembled structures was transformed from nanoparticles to micrometer-sized one-dimensional (1D) structures such as sticks and fibers. In a pink-red toluene solution, the periphery of the central ring became more planar. The resulting significant amount of the keto-hydrazone tautomer grew into micro- and millimeter-sized 1D structures. Interestingly, when THF-H2O (1:1) mixtures were stored at a low temperature, elongated fibers were stacked sideways and eventually developed into anisotropic two-dimensional (2D) sheets. Notably, subsequent exposure of visible-light-irradiated sphere samples to solvent vapor resulted in reversible fluorescence off↔on switching accompanied by morphological restoration. These findings suggest that rational selection of organic dyes, solvents, and light is important for developing reusable fluorescent materials.
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4
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Abstract
The reversible photoisomerization of azobenzenes has been extensively studied to construct systems with optical responsiveness; however, this process limits the luminescence of these compounds. Recently, there have been many efforts to design and synthesize fluorescent azobenzene compounds, such as inhibition of electron transfer, inducing aggregation, and metal-enhancement, which make the materials ideal for application in fluorescence probes, light-emitting devices, molecular detection, etc. Herein, we review the recently reported progress in the development of various fluorescent azobenzenes and summarize the possible mechanism of their fluorescence emission. The potential applications of these materials are also discussed. Finally, in order to guide research in this field, the existing problems and future development prospects are discussed.
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5
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Yue Y, Azumi R, Norikane Y. Fatigue‐Resistant Crosslinked Azopolymers with Inhibited H‐Aggregation for Efficient Photopatterning. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Youfeng Yue
- Research Institute for Advanced Electronics and Photonics National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8565 Japan
| | - Reiko Azumi
- Research Institute for Advanced Electronics and Photonics National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8565 Japan
| | - Yasuo Norikane
- Research Institute for Advanced Electronics and Photonics National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8565 Japan
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Raman A, Neelambra AU, Karunakaran V, Easwaramoorthi S. Non-photoisomerizable butterfly shaped tetrasubstituted azobenzenes: synthesis and photophysical studies. NEW J CHEM 2020. [DOI: 10.1039/d0nj01092h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The trans-azobenzene (AB) substituted derivatives with bulky carbazole (1), phenothiazine (2), and phenyl (3) have been synthesized to understand the effect of steric crowding around the –NN– linkage on the photoisomerization process.
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Affiliation(s)
- Arunachalam Raman
- Inorganic and Physical Chemistry Laboratory
- CSIR-Central Leather Research Institute
- Chennai 600 020
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Afeefah U. Neelambra
- Photosciences & Photonics Section
- Chemical Sciences and Technology Division
- CSIR – National Institute for Interdisciplinary Science and Technology
- Thiruvananthapuram
- India
| | - Venugopal Karunakaran
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-CLRI Campus
- Chennai 600 020
- India
- Photosciences & Photonics Section
| | - Shanmugam Easwaramoorthi
- Inorganic and Physical Chemistry Laboratory
- CSIR-Central Leather Research Institute
- Chennai 600 020
- India
- Academy of Scientific and Innovative Research (AcSIR)
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7
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Zhang Z, He Y, Zhou Y, Yu C, Han L, Li T. Pyrazolylazophenyl Ether‐Based Photoswitches: Facile Synthesis, (Near‐)Quantitative Photoconversion, Long Thermal Half‐Life, Easy Functionalization, and Versatile Applications in Light‐Responsive Systems. Chemistry 2019; 25:13402-13410. [DOI: 10.1002/chem.201902897] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/18/2019] [Indexed: 12/20/2022]
Affiliation(s)
- Zhao‐Yang Zhang
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Yixin He
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Ying Zhou
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Chunyang Yu
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Lu Han
- School of Chemical Science and Engineering Tongji University Shanghai 200092 P. R. China
| | - Tao Li
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
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8
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Abe I, Han M. Green-light-induced melting of self-assembled azobenzene nano/microstructures. NEW J CHEM 2019. [DOI: 10.1039/c9nj05084a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nano/microstructures assembled from trigonal molecules with three ortho-dialkylated azobenzene wings exhibit green-light-induced melting, color tuning and fluorescence switching.
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Affiliation(s)
- Ikue Abe
- Department of Chemistry and Biotechnology
- Tottori University
- Tottori 680-8552
- Japan
| | - Mina Han
- Department of Chemistry and Biotechnology
- Tottori University
- Tottori 680-8552
- Japan
- Department of Chemistry Education
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9
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Han M, Nakanishi H. Light-Sensitive Microspheres Based on Spherical Assembly of Star-Shaped Chromophores. J PHOTOPOLYM SCI TEC 2018. [DOI: 10.2494/photopolymer.31.527] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mina Han
- Department of Chemistry and Biotechnology, Tottori University
- Department of Chemistry Education, Kongju National University
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10
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Wang D, Zhao W, Wei Q, Zhao C, Zheng Y. Photoswitchable Azobenzene/Cyclodextrin Host-Guest Complexes: From UV- to Visible/Near-IR-Light-Responsive Systems. CHEMPHOTOCHEM 2018. [DOI: 10.1002/cptc.201700233] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Dongsheng Wang
- School of Optoelectronic Information; University of Electronic Science and Technology of China, No. 4, Section 2; North Jianshe Road 610054 Chengdu China
| | - Weifeng Zhao
- College of Polymer Science and Engineering; Sichuan University, No. 24 South Section 1; Yihuan Road Chengdu China
| | - Qiang Wei
- Department of Cellular Biophysics; Max-Planck-Institute for Medical Research, Heidelberg; Heisenbergstr. 3 70569 Stuttgart Germany
| | - Changsheng Zhao
- College of Polymer Science and Engineering; Sichuan University, No. 24 South Section 1; Yihuan Road Chengdu China
| | - Yonghao Zheng
- School of Optoelectronic Information; University of Electronic Science and Technology of China, No. 4, Section 2; North Jianshe Road 610054 Chengdu China
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11
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Bushuyev OS, Tomberg A, Vinden JR, Moitessier N, Barrett CJ, Friščić T. Azo⋯phenyl stacking: a persistent self-assembly motif guides the assembly of fluorinated cis-azobenzenes into photo-mechanical needle crystals. Chem Commun (Camb) 2016; 52:2103-6. [DOI: 10.1039/c5cc08590j] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We describe a novel, persistent motif of molecular assembly in photo-mechanical crystals and cocrystals of fluorinated cis-azobenzenes.
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Affiliation(s)
| | - Anna Tomberg
- Department of Chemistry
- McGill University
- Montreal
- Canada
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12
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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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13
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Uchida E, Sakaki K, Nakamura Y, Azumi R, Hirai Y, Akiyama H, Yoshida M, Norikane Y. Control of the Orientation and Photoinduced Phase Transitions of Macrocyclic Azobenzene. Chemistry 2013; 19:17391-7. [DOI: 10.1002/chem.201302674] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 08/12/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Emi Uchida
- Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1‐1‐1 Higashi, Tsukuba, Ibaraki 305‐8565 (Japan)
| | - Kouji Sakaki
- Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1‐1‐1 Higashi, Tsukuba, Ibaraki 305‐8565 (Japan)
| | - Yumiko Nakamura
- Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1‐1‐1 Higashi, Tsukuba, Ibaraki 305‐8565 (Japan)
| | - Reiko Azumi
- Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1‐1‐1 Higashi, Tsukuba, Ibaraki 305‐8565 (Japan)
| | - Yuki Hirai
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1‐1‐1 Higashi, Tsukuba, Ibaraki 305‐8565 (Japan)
| | - Haruhisa Akiyama
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1‐1‐1 Higashi, Tsukuba, Ibaraki 305‐8565 (Japan)
| | - Masaru Yoshida
- Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1‐1‐1 Higashi, Tsukuba, Ibaraki 305‐8565 (Japan)
| | - Yasuo Norikane
- Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1‐1‐1 Higashi, Tsukuba, Ibaraki 305‐8565 (Japan)
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14
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Singleton TA, Ramsay KS, Barsan MM, Butler IS, Barrett CJ. Azobenzene Photoisomerization under High External Pressures: Testing the Strength of a Light-Activated Molecular Muscle. J Phys Chem B 2012; 116:9860-5. [DOI: 10.1021/jp3060872] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas A. Singleton
- Department
of Chemistry, McGill University, Montreal,
Quebec H3A 0B8, Canada
| | - Kevin S. Ramsay
- Department
of Chemistry, McGill University, Montreal,
Quebec H3A 0B8, Canada
| | - Mirela M. Barsan
- Department
of Chemistry, McGill University, Montreal,
Quebec H3A 0B8, Canada
| | - Ian S. Butler
- Department
of Chemistry, McGill University, Montreal,
Quebec H3A 0B8, Canada
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15
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Tsai BK, Chen CH, Hung CH, Hsiao VKS, Chu CC. Photoswitchable fluorescence on/off behavior between cis- and trans-rich azobenzenes. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm34776h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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17
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Han M, Honda T. Correlation between the molecular structure and trans ↔ cis isomerization characteristics of azobenzenes. Sci China Chem 2011. [DOI: 10.1007/s11426-011-4413-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
The photoisomerization of azobenzene has been known for almost 75 years but only recently has this process been widely applied to biological systems. The central challenge of how to productively couple the isomerization process to a large functional change in a biomolecule has been met in a number of instances and it appears that effective photocontrol of a large variety of biomolecules may be possible. This critical review summarizes key properties of azobenzene that enable its use as a photoswitch in biological systems and describes strategies for using azobenzene photoswitches to drive functional changes in peptides, proteins, nucleic acids, lipids, and carbohydrates (192 references).
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Affiliation(s)
- Andrew A Beharry
- Department of Chemistry, University of Toronto, 80 St. George St. Toronto, ON M5S 3H6, Canada
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19
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Han M, Honda T, Ishikawa D, Ito E, Hara M, Norikane Y. Realization of highly photoresponsive azobenzene-functionalized monolayers. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03697h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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A light-gated, potassium-selective glutamate receptor for the optical inhibition of neuronal firing. Nat Neurosci 2010; 13:1027-32. [PMID: 20581843 PMCID: PMC2915903 DOI: 10.1038/nn.2589] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2010] [Accepted: 05/26/2010] [Indexed: 12/12/2022]
Abstract
Genetically targeted light-activated ion channels and pumps make it possible to determine the role of specific neurons in neuronal circuits, information processing and behavior. Here, we describe the development of a K+-selective ionotropic glutamate receptor that reversibly inhibits neuronal activity in response to light in dissociated neurons and brain slice and reversibly suppresses behavior in zebrafish. The receptor is a chimera of the pore region of a K+-selective bacterial glutamate receptor and the ligand binding domain of the light-gated mammalian kainate receptor (iGluR6/GluK2). This hyperpolarizing light-gated channel, HyLighter, is turned on by a brief light pulse at one wavelength and turned off by a pulse at a second wavelength. The control is obtained at moderate intensity. After optical activation, the photo-current and optical silencing of activity persist in the dark for extended periods. The low light requirement and bi-stability of HyLighter represent advantages for the dissection of neural circuitry.
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Bandara HMD, Friss TR, Enriquez MM, Isley W, Incarvito C, Frank HA, Gascon J, Burdette SC. Proof for the Concerted Inversion Mechanism in the trans→cis Isomerization of Azobenzene Using Hydrogen Bonding To Induce Isomer Locking. J Org Chem 2010; 75:4817-27. [DOI: 10.1021/jo100866m] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- H. M. Dhammika Bandara
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road U-3060, Storrs, Connecticut 06269
| | - Tracey R. Friss
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road U-3060, Storrs, Connecticut 06269
| | - Miriam M. Enriquez
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road U-3060, Storrs, Connecticut 06269
| | - William Isley
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road U-3060, Storrs, Connecticut 06269
| | - Christopher Incarvito
- Department of Chemistry, Yale University, 225 Prospect Street, P.O. Box 208107, New Haven, Connecticut 06520-8107
| | - Harry A. Frank
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road U-3060, Storrs, Connecticut 06269
| | - Jose Gascon
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road U-3060, Storrs, Connecticut 06269
| | - Shawn C. Burdette
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road U-3060, Storrs, Connecticut 06269
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22
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Nishioka H, Liang X, Asanuma H. Effect of the ortho modification of azobenzene on the photoregulatory efficiency of DNA hybridization and the thermal stability of its cis form. Chemistry 2010; 16:2054-62. [PMID: 20104556 DOI: 10.1002/chem.200902789] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We synthesized various azobenzenes methylated at their ortho positions with respect to the azo bond for more effective photoregulation of DNA hybridization. Photoregulatory efficiency, evaluated from the change of T(m) (DeltaT(m)) induced by trans-cis isomerization, was significantly improved for all ortho-modified azobenzenes compared with non-modified azobenzene due to the more stabilized trans form and the more destabilized cis form. Among the synthesized azobenzenes, 4-carboxy-2',6'-dimethylazobenzene (2',6'-Me-Azo), in which two ortho positions of the distal benzene ring with respect to carboxyl group were methylated, exhibited the largest DeltaT(m), whereas the newly synthesized 2,6-Me-Azo (4-carboxy-2,6-dimethylazobenzene), which possesses two methyl groups on the two ortho positions of the other benzene ring, showed moderate improvement of DeltaT(m). Both NMR spectroscopic analysis and computer modeling revealed that the two methyl groups on 2',6'-Me-Azo were located near the imino protons of adjacent base pairs; these stabilized the DNA duplex by stacking interactions in the trans form and destabilized the DNA duplex by steric hindrance in the cis form. In addition, the thermal stability of cis-2',6'-Me-Azo was also greatly improved, but not that of cis-2,6-Me-Azo. Solvent effects on the half-life of the cis form demonstrated that cis-to-trans isomerization of all the modified azobenzenes proceeded through an inversion route. Improved thermal stability of 2',6'-Me-Azo but not 2,6-Me-Azo in the cis form was attributed to the retardation of the inversion process due to steric hindrance between lone pair electrons of the pi orbital of the nitrogen atom and the methyl group on the distal benzene ring.
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Affiliation(s)
- Hidenori Nishioka
- Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Han M, Ishikawa D, Honda T, Ito E, Hara M. Light-driven molecular switches in azobenzene self-assembled monolayers: effect of molecular structure on reversible photoisomerization and stable cis state. Chem Commun (Camb) 2010; 46:3598-600. [DOI: 10.1039/b921801g] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Han M, Hirade T, Hara M. A reversibly photoswitchable mononuclear palladium(ii) complex with ortho-diethylated azobenzene ligands. NEW J CHEM 2010. [DOI: 10.1039/c0nj00345j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Suwa K, Otsuki J, Goto K. Photoisomerization and Thermal Isomerization of Shuttlecock- and Bowl-Equipped (Phenylazo)pyridines. J Phys Chem A 2009; 114:884-90. [DOI: 10.1021/jp909922y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazuya Suwa
- College of Science and Technology, Nihon University, 1-8-14 Kanda Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan, and Interactive Research Center of Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Joe Otsuki
- College of Science and Technology, Nihon University, 1-8-14 Kanda Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan, and Interactive Research Center of Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kei Goto
- College of Science and Technology, Nihon University, 1-8-14 Kanda Surugadai, Chiyoda-ku, Tokyo 101-8308, Japan, and Interactive Research Center of Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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Barrett AGM, Crimmin MR, Hill MS, Hitchcock PB, Kociok-Köhn G, Procopiou PA. Triazenide Complexes of the Heavier Alkaline Earths: Synthesis, Characterization, And Suitability for Hydroamination Catalysis. Inorg Chem 2008; 47:7366-76. [DOI: 10.1021/ic800789x] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anthony G. M. Barrett
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K., Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, U.K., The Chemistry Laboratory, University of Sussex, Falmer, Brighton, East Sussex BN1 9QJ, U.K., and GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Mark R. Crimmin
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K., Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, U.K., The Chemistry Laboratory, University of Sussex, Falmer, Brighton, East Sussex BN1 9QJ, U.K., and GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Michael S. Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K., Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, U.K., The Chemistry Laboratory, University of Sussex, Falmer, Brighton, East Sussex BN1 9QJ, U.K., and GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Peter B. Hitchcock
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K., Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, U.K., The Chemistry Laboratory, University of Sussex, Falmer, Brighton, East Sussex BN1 9QJ, U.K., and GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Gabriele Kociok-Köhn
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K., Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, U.K., The Chemistry Laboratory, University of Sussex, Falmer, Brighton, East Sussex BN1 9QJ, U.K., and GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Panayiotis A. Procopiou
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K., Department of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, U.K., The Chemistry Laboratory, University of Sussex, Falmer, Brighton, East Sussex BN1 9QJ, U.K., and GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
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Han MR, Hashizume D, Hara M. Self-assembly of long-lived cis-azobenzenes into crystalline nanoparticles. NEW J CHEM 2007. [DOI: 10.1039/b709092g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Norikane Y, Tamaoki N. Photochemical and Thermalcis/trans Isomerization of Cyclic and Noncyclic Azobenzene Dimers: Effect of a Cyclic Structure on Isomerization. European J Org Chem 2006. [DOI: 10.1002/ejoc.200500682] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Rakotondradany F, Whitehead MA, Lebuis AM, Sleiman HF. Photoresponsive Supramolecular Systems: Self-Assembly of Azodibenzoic Acid Linear Tapes and Cyclic Tetramers. Chemistry 2003; 9:4771-80. [PMID: 14566885 DOI: 10.1002/chem.200304864] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A new strategy to effect photoinduced control over molecular self-assembly is reported. This strategy uses the reversible trans-cis photoisomerization of a novel azobenzene system, where the trans- and cis-forms self-assemble into dramatically different higher-order structures. The trans-azobenzene form of this molecule associates into infinite hydrogen-bonded linear tapes, while the cis-azobenzene form undergoes hydrogen-bonded self-assembly into cyclic tetramers. This results in a second level of association, where the cis-hydrogen-bonded supramolecular cycles ultimately form long, rod-like aggregates through stacking interactions.
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Affiliation(s)
- Felaniaina Rakotondradany
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal Québec H3A 2K6, Canada
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Bunce NJ, Forber CL. On the Correlation between Δ H‡ vs Δ S‡ in the thermal cis-to-trans isomerization of azobenzenes. JOURNAL OF CHEMICAL RESEARCH 2000. [DOI: 10.3184/030823400103165608] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Variable-temperature kinetics allow the determination of Δ H‡ vs Δ S‡ in a single experiment. Multiple variable-temperature data sets for the thermal isomerization of cis-azobenzene show an apparent isokinetic relationship, but this is due only to the mathematical correlation between Δ H‡ vs Δ S‡; the magnitude of the effect is almost identical to that observed for the thermal isomerization of a series of ortho-alkylated azobenzenes.
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Affiliation(s)
- Nigel J. Bunce
- Department of Chemistry and Biochemistry, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
| | - Christine L. Forber
- Department of Chemistry and Biochemistry, University of Guelph, Guelph, Ontario, Canada, N1G 2W1
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Nanasawa M, Horikago Y, Hirai M. Photo-regulated metal coordination of azobenzene polymer having sterically controlled ion binding sites. Polym Bull (Berl) 1995. [DOI: 10.1007/bf00312900] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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