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Abegão LMG, Cocca LHZ, Mulatier JC, Pitrat D, Andraud C, Misoguti L, Mendonça CR, Vivas MG, De Boni L. Effective π-electron number and symmetry perturbation effect on the two-photon absorption of oligofluorenes. Phys Chem Chem Phys 2021; 23:18602-18609. [PMID: 34612397 DOI: 10.1039/d1cp02553h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorene-based molecules exhibit significant nonlinear optical responses and multiphoton absorption in the visible region, which, combined with the high fluorescence quantum yield in organic solvents, could make this class of materials potentially engaging in diverse photonics applications. Thus, herein, we have determined the two-photon absorption (2PA) of oligofluorenes containing three, five, and seven repetitive units by employing the wavelength-tunable femtosecond Z-scan technique. Our outcomes have shown that the 2PA cross-section in oligofluorenes presents an enhanced value of around 18 GM per Neff, in which Neff is the effective number of π-electrons, for the pure 2PA allowed transition (11Ag-like → 21Ag-like). Furthermore, a weak 2PA transition was observed in the same spectral region strongly allowed by one-photon absorption (11Ag-like → 11Bu-like). This last result suggests a molecular symmetry perturbation, probably induced by the molecular disorder triggered by the increase of moieties in the oligofluorene structure. We have calculated the permanent dipole moment difference related to the lowest-energy transition using the Lippert-Matagaformalism and the 2PA sum-over-states approach to confirm this assumption. Moreover, we have estimated the fundamental limits for the 2PA cross-section in oligofluorenes.
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Affiliation(s)
- Luis M G Abegão
- Photonics Group, Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970 São Carlos, SP, Brazil.
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2
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V.M. V, Chetti P. Impact of polycyclic aromatic hydrocarbons and heteroatomic bridges (N, S, and O) on optoelectronic properties of 1,3,5‐triazine derivatives: A computational insight. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4128] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Vidya V.M.
- Department of Chemistry National Institute of Technology Kurukshetra India
| | - Prabhakar Chetti
- Department of Chemistry National Institute of Technology Kurukshetra India
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3
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Seintis K, Kalis IK, Klikar M, Bureš F, Fakis M. Excitation/detection energy controlled anisotropy dynamics in asymmetrically cyano substituted tri-podal molecules. Phys Chem Chem Phys 2020; 22:16681-16690. [PMID: 32658218 DOI: 10.1039/d0cp01726d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present work, the photophysical properties of two series of asymmetrical tri-podal molecules are studied, in order to determine the dependence of energy localization/delocalization phenomena on excitation and detection wavelength, by means of steady state, femtosecond time-resolved fluorescence and anisotropy spectroscopy. The molecules bear triphenylamine as an electron donating core and an acetylenic or olefinic π-conjugated bridge. At the periphery, they are substituted by no, one, two or three -CN groups used as electron acceptors. Thus, the compounds with only one or two -CN groups are asymmetrically substituted. As a comparison, the photophysics of their dipolar and quadrupolar analogues is also presented. The steady state absorption spectra of the asymmetrical tri-podal compounds exhibit a broadening and a low energy shoulder due to the splitting of the excited states. The fluorescence spectra are more red-shifted in the tri-podal molecules with a single -CN group, providing the first evidence of its mostly dipolar nature. Time-resolved anisotropy measurements by using different excitation and detection wavelengths provide clear evidence that the asymmetrical tri-podal molecules with one or two -CN groups behave like octupolar molecules upon high-energy excitation (the initial anisotropy is found 0.1-0.15), while upon low-energy excitation they reveal a behavior expected for linear dipolar or V-shaped quadrupolar molecules (the initial anisotropy is very close to 0.4 and 0.17, respectively). The symmetrical tri-podal compounds with no or three cyano groups, exhibit an anisotropy depolarization time of 2.5 ps attributed to energy hopping. The amplitude of this energy hopping component is wavelength dependent and increases as the excitation is shifted towards the long wavelength edge.
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Affiliation(s)
- K Seintis
- Department of Physics, University of Patras, GR-26504, Patras, Greece.
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Dereka B, Svechkarev D, Rosspeintner A, Aster A, Lunzer M, Liska R, Mohs AM, Vauthey E. Solvent tuning of photochemistry upon excited-state symmetry breaking. Nat Commun 2020; 11:1925. [PMID: 32317631 PMCID: PMC7174366 DOI: 10.1038/s41467-020-15681-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 03/20/2020] [Indexed: 12/29/2022] Open
Abstract
The nature of the electronic excited state of many symmetric multibranched donor–acceptor molecules varies from delocalized/multipolar to localized/dipolar depending on the environment. Solvent-driven localization breaks the symmetry and traps the exciton in one branch. Using a combination of ultrafast spectroscopies, we investigate how such excited-state symmetry breaking affects the photochemical reactivity of quadrupolar and octupolar A–(π-D)2,3 molecules with photoisomerizable A–π–D branches. Excited-state symmetry breaking is identified by monitoring several spectroscopic signatures of the multipolar delocalized exciton, including the S2 ← S1 electronic transition, whose energy reflects interbranch coupling. It occurs in all but nonpolar solvents. In polar media, it is rapidly followed by an alkyne–allene isomerization of the excited branch. In nonpolar solvents, slow and reversible isomerization corresponding to chemically-driven symmetry breaking, is observed. These findings reveal that the photoreactivity of large conjugated molecules can be tuned by controlling the localization of the excitation. Symmetric multibranched donor-acceptor molecules are promising photoactive materials for diverse applications. Here the authors show that, in octupolar and quadrupolar dyes, excited-state symmetry breaking occurs efficiently in polar solvents only and results in a concentration of the excitation that may trigger fast photochemical reactions.
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Affiliation(s)
- Bogdan Dereka
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211, Geneva, Switzerland.,Department of Chemistry and Institute for Biophysical Dynamics, James Franck Institute, The University of Chicago, 929 E. 57th St., Chicago, IL, 60637, USA
| | - Denis Svechkarev
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, 68198-6858, USA
| | - Arnulf Rosspeintner
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211, Geneva, Switzerland
| | - Alexander Aster
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211, Geneva, Switzerland
| | - Markus Lunzer
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163/MC, 1060, Vienna, Austria
| | - Robert Liska
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163/MC, 1060, Vienna, Austria
| | - Aaron M Mohs
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, 68198-6858, USA.,Department of Biochemistry and Molecular Biology, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, 68198-6858, USA
| | - Eric Vauthey
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211, Geneva, Switzerland.
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Pagidi S, Kalluvettukuzhy NK, Thilagar P. Effect of Branching on the Delayed Fluorescence and Phosphorescence of Simple Borylated Arylamines. Inorg Chem 2020; 59:3142-3151. [DOI: 10.1021/acs.inorgchem.9b03446] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Sudhakar Pagidi
- Department of Inorganic and Physical Chemistry, Indian Institute of Science (IISc), Bangalore 560012, India
| | - Neena K. Kalluvettukuzhy
- Department of Inorganic and Physical Chemistry, Indian Institute of Science (IISc), Bangalore 560012, India
| | - Pakkirisamy Thilagar
- Department of Inorganic and Physical Chemistry, Indian Institute of Science (IISc), Bangalore 560012, India
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Kournoutas F, Seintis K, Karakostas N, Tydlitát J, Achelle S, Pistolis G, Bureš F, Fakis M. Photophysical and Protonation Time Resolved Studies of Donor–Acceptor Branched Systems With Pyridine Acceptors. J Phys Chem A 2018; 123:417-428. [DOI: 10.1021/acs.jpca.8b08628] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Fotis Kournoutas
- Department of Physics, University of Patras, Greece, GR-26504 Patras, Greece
| | - Kostas Seintis
- Department of Physics, University of Patras, Greece, GR-26504 Patras, Greece
| | - Nikolaos Karakostas
- NCSR “Demokritos” Institute of Nanosciences and Nanotechnology (INN), 153 10 Athens, Greece
| | - Jiří Tydlitát
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Sylvain Achelle
- University of Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, F-35000 Rennes, France
| | - George Pistolis
- NCSR “Demokritos” Institute of Nanosciences and Nanotechnology (INN), 153 10 Athens, Greece
| | - Filip Bureš
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Mihalis Fakis
- Department of Physics, University of Patras, Greece, GR-26504 Patras, Greece
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Yang S, Hu W, Zhang X, He P, Pattengale B, Liu C, Cendejas M, Hermans I, Zhang X, Zhang J, Huang J. 2D Covalent Organic Frameworks as Intrinsic Photocatalysts for Visible Light-Driven CO2 Reduction. J Am Chem Soc 2018; 140:14614-14618. [DOI: 10.1021/jacs.8b09705] [Citation(s) in RCA: 301] [Impact Index Per Article: 50.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Sizhuo Yang
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Wenhui Hu
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Xin Zhang
- Department of Chemistry, University of Nebraska−Lincoln, Lincoln, Nebraska 68588, United States
| | - Peilei He
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Brian Pattengale
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
| | - Cunming Liu
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60349, United States
| | - Melissa Cendejas
- Department of Chemistry, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
| | - Ive Hermans
- Department of Chemistry, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
- Department of Chemical and Biological Engineering, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
| | - Xiaoyi Zhang
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60349, United States
| | - Jian Zhang
- Department of Chemistry, University of Nebraska−Lincoln, Lincoln, Nebraska 68588, United States
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jier Huang
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201, United States
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Seintis K, Agathangelou D, Cvejn D, Almonasy N, Bureš F, Giannetas V, Fakis M. Femtosecond to nanosecond studies of octupolar molecules and their quadrupolar and dipolar analogues. Phys Chem Chem Phys 2017; 19:16485-16497. [DOI: 10.1039/c7cp01463e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The fs–ps anisotropy dynamics of octupolar, quadrupolar and dipolar molecules with different π-bridges.
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Affiliation(s)
- K. Seintis
- Department of Physics
- University of Patras
- Patras
- Greece
| | | | - D. Cvejn
- Institute of Organic Chemistry and Technology
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice
- Czech Republic
| | - N. Almonasy
- Institute of Organic Chemistry and Technology
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice
- Czech Republic
| | - F. Bureš
- Institute of Organic Chemistry and Technology
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice
- Czech Republic
| | - V. Giannetas
- Department of Physics
- University of Patras
- Patras
- Greece
| | - M. Fakis
- Department of Physics
- University of Patras
- Patras
- Greece
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9
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Dini D, Calvete MJF, Hanack M. Nonlinear Optical Materials for the Smart Filtering of Optical Radiation. Chem Rev 2016; 116:13043-13233. [PMID: 27933768 DOI: 10.1021/acs.chemrev.6b00033] [Citation(s) in RCA: 242] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting. All known mechanisms of optical limiting have been analyzed and discussed for the different types of materials.
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Affiliation(s)
- Danilo Dini
- Department of Chemistry, University of Rome "La Sapienza" , P.le Aldo Moro 5, I-00185 Rome, Italy
| | - Mário J F Calvete
- CQC, Department of Chemistry, Faculty of Science and Technology, University of Coimbra , Rua Larga, P 3004-535 Coimbra, Portugal
| | - Michael Hanack
- Institut für Organische Chemie, Universität Tübingen , Auf der Morgenstelle 18, D-72076 Tübingen, Germany
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Cvejn D, Michail E, Seintis K, Klikar M, Pytela O, Mikysek T, Almonasy N, Ludwig M, Giannetas V, Fakis M, Bureš F. Solvent and branching effect on the two-photon absorption properties of push–pull triphenylamine derivatives. RSC Adv 2016. [DOI: 10.1039/c5ra25170b] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The photophysical and two-photon absorption (2PA) properties of two tri-podal molecules and of their quadrupolar and dipolar counterparts are reported for a series of solvents with varying polarity.
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Do K, Choi H, Lim K, Jo H, Cho JW, Nazeeruddin MK, Ko J. Star-shaped hole transporting materials with a triazine unit for efficient perovskite solar cells. Chem Commun (Camb) 2014; 50:10971-4. [DOI: 10.1039/c4cc04550e] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Novel star-shaped hole transporting materials with a triazine unit have been synthesized.
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Affiliation(s)
- Kwangseok Do
- Department of Advanced Materials Chemistry
- Korea University Sejong Campus
- Sejong City 339-700, Republic of Korea
| | - Hyeju Choi
- Department of Advanced Materials Chemistry
- Korea University Sejong Campus
- Sejong City 339-700, Republic of Korea
| | - Kimin Lim
- Department of Advanced Materials Chemistry
- Korea University Sejong Campus
- Sejong City 339-700, Republic of Korea
| | - Hyunjun Jo
- Department of Advanced Materials Chemistry
- Korea University Sejong Campus
- Sejong City 339-700, Republic of Korea
| | - Jin Woo Cho
- Advanced Analysis Center
- Korea Institute of Science and Technology(KIST)
- Seongbuk-gu, Republic of Korea
| | - Mohammad K. Nazeeruddin
- Laboratory of Photonics and Interfaces
- Department of Chemistry and Chemical Engineering
- Swiss Federal Institute of Technology
- CH-1015 Lausanne, Switzerland
| | - Jaejung Ko
- Department of Advanced Materials Chemistry
- Korea University Sejong Campus
- Sejong City 339-700, Republic of Korea
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