2
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Tober N, Rieth T, Lehmann M, Detert H. Synthesis, Thermal, and Optical Properties of Tris(5-aryl-1,3,4-oxadiazol-2-yl)-1,3,5-triazines, New Star-Shaped Fluorescent Discotic Liquid Crystals. Chemistry 2019; 25:15295-15304. [PMID: 31424134 PMCID: PMC6916359 DOI: 10.1002/chem.201902975] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Indexed: 01/01/2023]
Abstract
The synthesis of tris(aryloxadiazolyl)triazines (TOTs), C3‐symmetrical star‐shaped mesogenes with a 1,3,5‐triazine center, 5‐phenyl‐1,3,4‐oxadiazole arms, and various peripheral alkoxy side chains is reported. Threefold Huisgen reaction on a central triazine tricarboxylic acid and suitable aryltetrazoles yields the title compounds. Selected analogues with a benzene center are included in this study and allow for an evaluation of the impact of the central unit on the physical properties. Thermal (differential scanning calorimetry, DSC; polarization optical microscopy, POM), optical (UV/Vis, fluorescence), electric (time of flight, TOF), and structural (single crystal; wide‐angle X‐ray scattering, WAXS) properties of these compounds were investigated. The modification of alkoxy chain length and substitution pattern allows for a tuning of the physical properties. TOTs emit blue to yellow light, depending on conjugation length, donor–acceptor substitution, and solvent polarity, whereas concentration quenches and aggregation enhances the emission. The width of the mesophases is typically around ΔT=100–150 K but can even exceed 220 K. Polarization optical microscopy and X‐ray diffraction on oriented filaments reveal that TOTs are highly ordered liquid crystals (LCs) with long‐range hexagonal columnar structure.
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Affiliation(s)
- Natalie Tober
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55128, Mainz, Germany
| | - Thorsten Rieth
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55128, Mainz, Germany
| | - Matthias Lehmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Heiner Detert
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55128, Mainz, Germany
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3
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Zhao KC, Du JQ, Wang HF, Zhao KQ, Hu P, Wang BQ, Monobe H, Heinrich B, Donnio B. Board-like Fused-Thiophene Liquid Crystals and their Benzene Analogs: Facile Synthesis, Self-Assembly, p-Type Semiconductivity, and Photoluminescence. Chem Asian J 2019; 14:462-470. [PMID: 30536874 DOI: 10.1002/asia.201801483] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 11/22/2018] [Indexed: 11/09/2022]
Abstract
Fused-thiophene discotic liquid crystals were designed and easily synthesized by Suzuki coupling and FeCl3 oxidized tandem cyclodehydrogenation reactions, including homo- and cross-coupling reactions. The resulting hexagonal and rectangular columnar mesomorphic supramolecular structures formed were characterized by polarizing optical microscopy, differential scanning calorimetry, and small-angle X-ray scattering. The charge carrier transport properties in the mesophases of two of the synthesized fused-thiophene discogens were measured by transient photocurrent time-of-flight (TOF) technique, revealing fast hole transport values in the range of 10-3 to 10-2 cm2 V-1 s-1 , thus demonstrating potential applications in electronic devices. The luminescent sanidic mesogens, with different extended π-conjugated systems, also emit blue, green, or red light, with absolute photoluminescent quantum yields as high as 18 %.
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Affiliation(s)
- Kai-Chun Zhao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Jun-Qi Du
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Hai-Feng Wang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Ke-Qing Zhao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Ping Hu
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Bi-Qin Wang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China
| | - Hirosato Monobe
- Inorganic Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka, 563-8577, Japan
| | - Benoît Heinrich
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-University de Strasbourg (UMR 7504), 23 rue du Loess, BP43, 67034, Strasbourg, Cedex 2, France
| | - Bertrand Donnio
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-University de Strasbourg (UMR 7504), 23 rue du Loess, BP43, 67034, Strasbourg, Cedex 2, France
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4
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Mohan M, Pangannaya S, Satyanarayan MN, Trivedi DR. Multicoloured Thiophene Based AIEgens: Single Crystal Structure Elucidation, Spectral Behaviour and DFT Studies. ChemistrySelect 2018. [DOI: 10.1002/slct.201800252] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Makesh Mohan
- Optoelectronics Laboratory; Department of Physics; National Institute of Technology Karnataka (NITK) Surathkal; Mangalore - 575025
| | - Srikala Pangannaya
- Supramolecular Chemistry Laboratory; Department of Chemistry; National Institute of Technology Karnataka (NITK) Surathkal; Mangalore - 575025
| | - M. N. Satyanarayan
- Optoelectronics Laboratory; Department of Physics; National Institute of Technology Karnataka (NITK) Surathkal; Mangalore - 575025
| | - Darshak R. Trivedi
- Supramolecular Chemistry Laboratory; Department of Chemistry; National Institute of Technology Karnataka (NITK) Surathkal; Mangalore - 575025
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5
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Li K, Yu A, Meng X. Synthesis of Dibenzothiophene and 1,4-Dihydrodibenzothiophene Derivatives via Allylic Phosphonium Salt Initiated Domino Reactions. Org Lett 2018; 20:1106-1109. [DOI: 10.1021/acs.orglett.8b00028] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ke Li
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
| | - Aimin Yu
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
| | - Xiangtai Meng
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
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