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Kumar GD, Liao YC, Nazir R, Banasiewicz M, Chou PT, Gryko DT. Strongly emitting, centrosymmetric, ladder-type bis-coumarins with crankshaft architecture. Phys Chem Chem Phys 2023; 25:28824-28828. [PMID: 37853830 DOI: 10.1039/d3cp04121b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
Quadrupolar bis-coumarins bearing dialkylamino groups, prepared by a double Pechmann reaction and subsequent oxidation, strongly emit yellow-orange light. Comparison with non-substituted analogs reveals that, the photophysical properties of the conjugated bis-coumarins are controlled both by the dialkylamino substituents and by the π-system. Analogous but non-conjugated bis-coumarins emit blue light both in solution and in crystalline state. Unusually fast oxidation process in the crystalline state is responsible for the presence of two bands in their solid-state emission. Two-center, charge-transfer transition from an orbital delocalized on the entire molecule to the central benzene ring is responsible for photophysical properties.
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Affiliation(s)
- G Dinesh Kumar
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland.
| | - Yu-Chan Liao
- Department of Chemistry, National Taiwan University, 1 Roosevelt Road Section 4, Taipei 106, Taiwan.
| | - Rashid Nazir
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland.
- Advanced Fibers, Empa Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, St. Gallen 9014, Switzerland
| | - Marzena Banasiewicz
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw 02-668, Poland
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, 1 Roosevelt Road Section 4, Taipei 106, Taiwan.
| | - Daniel T Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland.
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Janus-Type AIE Fluorophores: Synthesis and Properties of π-Extended Coumarin-Bearing Triskelions. Molecules 2022; 27:molecules27217450. [DOI: 10.3390/molecules27217450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 10/22/2022] [Accepted: 10/27/2022] [Indexed: 11/06/2022] Open
Abstract
Janus-type triskelion-shaped fluorophores comprising coumarins bearing various electron-donating substituents (1aad, 1add, 1ccd, and 1cdd) were successfully synthesized via an intramolecular Ullmann coupling. Density functional theory (DFT) calculations indicated that all the compounds presented two different molecular surfaces, similar to Janus-type molecules. The absorption and fluorescence spectra of asymmetrical derivatives 1aad, 1add, 1ccd, and 1cdd exhibited a bathochromic shift due to their narrow highest occupied molecular orbital (HOMO) –lowest unoccupied molecular orbital (LUMO) gap. Natural transition orbital (NTO) analysis indicated that the excited state orbital overlaps differ among the C3 symmetrical and asymmetrical dyes. These triskelion-shaped fluorophores were found to form molecular nanoaggregates in THF/H2O mixtures and demonstrated aggregation-induced emission (AIE) enhancement characteristics as a result of restricting their molecular inversion. These results indicate that Janus-type AIE fluorophores are potentially applicable as solid-state fluorescent chiral materials, which can be optimized by controlling their molecular rearrangement in the solid state.
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Ueda M, Kokubun M, Mazaki Y. Synthesis, structures, and properties of triskelion-shaped fluorophores bearing coumarins with nitrogen-containing donor groups. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masafumi Ueda
- Department of Chemistry, Graduate School of Science, Kitasato University, 1-15-1, Kitasato, Minami-ku, Sagamihara, Kanagawa, 252-0373
| | - Mirai Kokubun
- Department of Chemistry, Graduate School of Science, Kitasato University, 1-15-1, Kitasato, Minami-ku, Sagamihara, Kanagawa, 252-0373
| | - Yasuhiro Mazaki
- Department of Chemistry, Graduate School of Science, Kitasato University, 1-15-1, Kitasato, Minami-ku, Sagamihara, Kanagawa, 252-0373
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Kasprzak A, Guńka PA, Kowalczyk A, Nowicka AM. Synthesis and structural, electrochemical and photophysical studies of triferrocenyl-substituted 1,3,5-triphenylbenzene: a cyan-light emitting molecule showing aggregation-induced enhanced emission. Dalton Trans 2020; 49:14807-14814. [PMID: 33094773 DOI: 10.1039/d0dt02948c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Triferrocenyl-substituted 1,3,5-triphenylbenzene was successfully synthesized in high yield. Single-crystal X-ray diffraction experiments revealed that the internal rotations of the ferrocenyl moieties are significantly restricted in the solid phase and that there are no significant π stacking interactions therein. The photoluminescence of the crystals is essentially the same as that of dilute chloroform solutions. However, studies of this cyan-light emitting substance in mixtures of chloroform and methanol revealed the aggregation-induced enhanced emission (AIEE) feature that boosts its fluorescence quantum yield from 13% up to 74%. We demonstrate the AIEE effect for a new class of easy-to-prepare aromatic molecules containing several metallocene units for the first time.
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Affiliation(s)
- Artur Kasprzak
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego Str. 3, 00-664 Warsaw, Poland.
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Synthesis of a triethylene glycol-capped benzo[1,2-c:4,5-c']bis[2]benzopyran-5,12-dione: A highly soluble dilactone-bridged p-terphenyl with a crankshaft architecture. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ueda M, Kokubun M, Mazaki Y. Triskelion‐Shaped π‐Luminophores Bearing Coumarin: Syntheses, Structures, and Luminescence Properties. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Masafumi Ueda
- Department of Chemistry, Graduate School of Science Kitasato University 1-15-1 Kitasato Minami-ku Sagamihara Kanagawa 252-0373 Japan
| | - Mirai Kokubun
- Department of Chemistry, Graduate School of Science Kitasato University 1-15-1 Kitasato Minami-ku Sagamihara Kanagawa 252-0373 Japan
| | - Yasuhiro Mazaki
- Department of Chemistry, Graduate School of Science Kitasato University 1-15-1 Kitasato Minami-ku Sagamihara Kanagawa 252-0373 Japan
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Francisco CS, Francisco CS, Constantino AF, Neto ÁC, Lacerda V. Synthetic Methods Applied in the Preparation of Coumarin-based Compounds. CURR ORG CHEM 2020. [DOI: 10.2174/1385272823666191121150047] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Coumarins (2H-chromen-2-ones) are heterocyclic compounds of wide scientific
interest due to their important biological and pharmaceutical properties such as antitumor,
antioxidant, anti-inflammatory and antimicrobial activities as well as enzymatic inhibitors
related to neurodegenerative diseases. Due to their structural variability, this compound
class has been attracting considerable interest in the natural products and synthetic organic
chemistry areas. Coumarins and their derivatives have been prepared by a variety of methods,
including Perkin, Wittig and Reformatsky reactions, Pechmann and Knoevenagel
condensations, and Claisen rearrangement, among others. In the present review we report
the different synthetic methods used in the preparation of coumarin derivatives exploited
in the last ten years (from 2008 to 2018), regarding the research demand for new structural
scaffolds.
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Affiliation(s)
- Carla S. Francisco
- Programa de Pós-Graduação em Química, Centro de Ciências Exatas, Universidade Federal do Espírito Santo, Campus Goiabeiras, Vitória, Brazil
| | - Cristina S. Francisco
- Programa de Pós-Graduação em Química, Centro de Ciências Exatas, Universidade Federal do Espírito Santo, Campus Goiabeiras, Vitória, Brazil
| | | | - Álvaro Cunha Neto
- Programa de Pós-Graduação em Química, Centro de Ciências Exatas, Universidade Federal do Espírito Santo, Campus Goiabeiras, Vitória, Brazil
| | - Valdemar Lacerda
- Programa de Pós-Graduação em Química, Centro de Ciências Exatas, Universidade Federal do Espírito Santo, Campus Goiabeiras, Vitória, Brazil
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Kielesiński Ł, Gryko DT, Sobolewski AL, Morawski O. The Interplay between Solvation and Stacking of Aromatic Rings Governs Bright and Dark Sites of Benzo[g]coumarins. Chemistry 2019; 25:15305-15314. [PMID: 31523856 DOI: 10.1002/chem.201903018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/27/2019] [Indexed: 11/06/2022]
Abstract
Coumarins are classic, strongly polarized fluorophores with multiple applications, and significant efforts have been put into modifying their emission characteristics and elucidating their photophysics. Expecting that π-expansion of these donor-acceptor chromophores could modify their ground- and excited-state characteristics, the authors performed combined, detailed photophysical and computational studies of linearly π-expanded coumarins, that is, 8-dialkylamino-3-carboxyalkyl-benzo[g]coumarins. The investigation led to the conclusion that emission is only possible thanks to the stabilizing effect of the solvent and that breaking of the lactone ring leads to the conical intersection with the ground state and induces the radiationless decay of the electronic excitation. Aiming at the fine-tuning the excited state properties through the construction of covalently linked dye assemblies, the authors designed and synthesized a new bis(benzo[g]coumarin), built from two similar moieties that exhibit different degrees of polarization due to the electron donor at position 8: one possesses a dialkylamino, and the other a weaker amide donor. Comprehensive studies have shown that the observed weak fluorescence of the system is the result of the interplay between the solvation-induced separation of the benzo[g]coumarin moieties, which stabilizes the emitting locally excited singlet state and the π-stacking interactions, favoring their sandwiched orientation and leading to the non-emissive charge-transfer state.
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Affiliation(s)
- Łukasz Kielesiński
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland.,Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland
| | - Daniel T Gryko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
| | - Andrzej L Sobolewski
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland
| | - Olaf Morawski
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland
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Rimaz M, Mousavi H, Khalili B, Aali F. A green and practical one-pot two-step strategy for the synthesis of symmetric 3,6-diarylpyridazines. J CHIN CHEM SOC-TAIP 2018. [DOI: 10.1002/jccs.201700470] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Mehdi Rimaz
- Department of Chemistry; Payame Noor University; Tehran Iran
| | - Hossein Mousavi
- Department of Chemistry; Payame Noor University; Tehran Iran
| | - Behzad Khalili
- Department of Chemistry, Faculty of Science; University of Guilan; Rasht Iran
| | - Farkhondeh Aali
- Department of Chemistry; Payame Noor University; Tehran Iran
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