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Oberhofer KE, Musheghyan M, Wegscheider S, Wörle M, Iglev ED, Nikolova RD, Kienberger R, Pekov PS, Iglev H. Individual control of singlet lifetime and triplet yield in halogen-substituted coumarin derivatives. RSC Adv 2020; 10:27096-27102. [PMID: 35515756 PMCID: PMC9055543 DOI: 10.1039/d0ra05737a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 10/01/2020] [Accepted: 07/07/2020] [Indexed: 11/21/2022] Open
Abstract
The photophysical properties of three 3-diethylphosphonocoumarin derivatives are studied by transient absorption spectroscopy and DFT calculations. The measured lifetime of the first excited singlet state changes upon halogen substitution at the 6-position from 40 ps for the unsubstituted compound to 100 ps for Cl and 24 ps for Br. This observation is in clear contradiction with the estimated singlet–triplet quantum yield, which increases with atomic weight of the substituted atom and is usually referred as a heavy-atom effect. The DFT calculations give evidence that the main reason for this behavior is the different composition of the HOMO, while the LUMO is similar for all three compounds. The optical excitation leads to intramolecular charge transfer from the halogen lone pairs to the π* molecular orbital and thus to a significant change in the molecular dipole moment. Hence, the latter phenomenon in combination with the heavy-atom effect enables an independent control of singlet lifetime and singlet–triplet quantum yield in the studied 3-diethylphosphonocoumarin derivatives. The photophysical properties of three 3-diethylphosphonocoumarin derivatives are studied by transient absorption spectroscopy and DFT calculations.![]()
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Affiliation(s)
| | | | | | - Martin Wörle
- Physics Department E11
- Technical University of Munich
- Germany
| | - Eleonora D. Iglev
- Physics Department E11
- Technical University of Munich
- Germany
- W. L. Gore & Associates GmbH
- 85640 Putzbrunn
| | | | | | - Petko St. Pekov
- Faculty of Chemistry and Pharmacy
- University of Sofia
- 1164 Sofia
- Bulgaria
| | - Hristo Iglev
- Physics Department E11
- Technical University of Munich
- Germany
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Rohman MA, Baruah P, Bhattacharjee D, Myrboh B, Mitra S. Fluorescence solvatochromism and modulated anticholinergic activity of novel coumarin compounds sequestered in human serum albumin nanocavities. NEW J CHEM 2019. [DOI: 10.1039/c9nj03293b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The antagonistic effect of the HSA matrix towards the acetylcholinesterase inhibition potencies of novel coumarin compounds is probed by multi-spectroscopic techniques.
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Affiliation(s)
- Mostofa Ataur Rohman
- Centre for Advanced Studies in Chemistry
- North-Eastern Hill University
- Shillong 793 022
- India
| | - Prayasee Baruah
- Centre for Advanced Studies in Chemistry
- North-Eastern Hill University
- Shillong 793 022
- India
| | | | - B. Myrboh
- Centre for Advanced Studies in Chemistry
- North-Eastern Hill University
- Shillong 793 022
- India
| | - Sivaprasad Mitra
- Centre for Advanced Studies in Chemistry
- North-Eastern Hill University
- Shillong 793 022
- India
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Li CR, Li SL, Yang ZY. Development of a coumarin-furan conjugate as Zn 2+ ratiometric fluorescent probe in ethanol-water system. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 174:214-222. [PMID: 27915158 DOI: 10.1016/j.saa.2016.11.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 11/18/2016] [Accepted: 11/19/2016] [Indexed: 06/06/2023]
Abstract
In this study, a novel coumarin-derived compound bearing the furan moiety called 7-diethylamino-3-formylcoumarin (2'-furan formyl) hydrazone (1) has been designed, synthesized and evaluated as a Zn2+ ratiometric fluorescent probe in ethanol-water system. This probe 1 showed good selectivity and high sensitivity towards Zn2+ over other metal ions investigated, and a decrease in fluorescence emission intensity at 511nm accompanied by an enhancement in fluorescence emission intensity at 520nm of this probe 1 was observed in the presence of Zn2+ in ethanol-water (V : V=9 : 1) solution, which provided ratiometric fluorescence detection of Zn2+. Additionally, the ratiometric fluorescence response of 1 to Zn2+ was nearly completed within 0.5min, which suggested that this probe 1 could be utilized for sensing and monitoring Zn2+ in environmental and biological systems for real-time detection.
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Affiliation(s)
- Chao-Rui Li
- College of Chemistry and Chemical Engineering, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China
| | - Si-Liang Li
- College of Chemistry and Chemical Engineering, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China; School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China
| | - Zheng-Yin Yang
- College of Chemistry and Chemical Engineering, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China.
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Irfan A, Muhammad S, Al-Sehemi AG, Al-Assiri MS, Kalam A, Chaudhry AR. The effect of anchoring groups on the electro-optical and charge injection in triphenylamine derivatives@Ti6O12. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2015. [DOI: 10.1142/s0219633615500273] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The triphenylamine (TPA), thiophene and pyrimidine are being used as efficient advanced functional semiconductor materials. In the present study, some new TPA donor–π–acceptor derivatives were designed where TPA moiety acts as donor, thiophene-pyrimidine π-bridge and acetic/cyanoacetic acid as acceptor. The ground-state geometries were optimized at B3LYP/6-31G** level of theory. The excitation energies and oscillator strengths were computed at TD-CAM-B3LYP/6-31G** (polarizable continuum model (PCM), in methanol) level of theory. The electronic, photophysical and charge transport properties were calculated wherever possible the computed values were compared with the available experimental as well as computational data. The electron injection (ΔG inject ), relative electron injection [Formula: see text], electron coupling constants (∣V RP ∣) and light harvesting efficiencies (LHE) have been calculated and compared with referenced compounds. The energies of the lowest unoccupied molecular orbitals (E LUMOs ), diagonal bandgaps and energy level offsets were studied to shed light on the electron transport behavior. The effect of anchoring groups (acetic acid and cyanoacetic acid) was studied on the properties of interests in the dye and dye@ Ti 6 O 12. It was observed that after interaction of dye with the TiO 2 cluster intra-molecular charge transport enhanced from HOMO of the dye to LUMO of the semiconductor cluster. The cyanoacetic acid anchoring group leads the superior LHE, ΔG inject and ∣V RP ∣ which might improve the solar cell performance.
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Affiliation(s)
- Ahmad Irfan
- Department of Chemistry, Faculty of Science, King Khalid University, Abha 61413, P. O. Box 9004, Saudi Arabia
| | - Shabbir Muhammad
- Department of Physics, Faculty of Science, King Khalid University, Abha 61413, P. O. Box 9004, Saudi Arabia
| | - Abdullah G. Al-Sehemi
- Department of Chemistry, Faculty of Science, King Khalid University, Abha 61413, P. O. Box 9004, Saudi Arabia
- Unit of Science and Technology, Faculty of Science, King Khalid University, Abha 61413, P. O. Box 9004, Saudi Arabia
- Research Center for Advanced Materials Science, King Khalid University, Abha 61413, P. O. Box 9004, Saudi Arabia
| | - M. S. Al-Assiri
- Department of Physics, Faculty of Sciences and Arts, Najran University, P. O. Box 1988, Najran 11001, Saudi Arabia
- Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, P. O. Box 1988, Najran 11001, Saudi Arabia
| | - Abul Kalam
- Department of Chemistry, Faculty of Science, King Khalid University, Abha 61413, P. O. Box 9004, Saudi Arabia
| | - Aijaz Rasool Chaudhry
- Department of Physics, Faculty of Science, King Khalid University, Abha 61413, P. O. Box 9004, Saudi Arabia
- Physics Department, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru, Malaysia
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