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Ito A, Iwamura M, Sakuda E. Excited-state dynamics of luminescent transition metal complexes with metallophilic and donor–acceptor interactions. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Luo Y, Wächtler M, Barthelmes K, Winter A, Schubert US, Dietzek B. Superexchange in the fast lane - intramolecular electron transfer in a molecular triad occurs by conformationally gated superexchange. Chem Commun (Camb) 2019; 55:5251-5254. [PMID: 30990492 DOI: 10.1039/c9cc01886g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoinduced electron transfer via hopping is generally considered to have a stronger temperature dependence than electron transfer via superexchange. However, in this work, an opposite trend of the temperature dependence is observed. This unexpected result is rationalized by considering the specific geometrical and electronic structure of the Ru-bis(terpyridine) photosensitizer.
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Affiliation(s)
- Yusen Luo
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany and Department Functional Interfaces, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straβe 9, 07745 Jena, Germany.
| | - Maria Wächtler
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany and Department Functional Interfaces, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straβe 9, 07745 Jena, Germany.
| | - Kevin Barthelmes
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Humboldtstraβe 10, 07743 Jena, Germany and Center for Energy and Environmental Chemistry Jena (CEEC Jena), Philosophenweg 7a, 07743 Jena, Germany
| | - Andreas Winter
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Humboldtstraβe 10, 07743 Jena, Germany and Center for Energy and Environmental Chemistry Jena (CEEC Jena), Philosophenweg 7a, 07743 Jena, Germany
| | - Ulrich S Schubert
- Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Humboldtstraβe 10, 07743 Jena, Germany and Center for Energy and Environmental Chemistry Jena (CEEC Jena), Philosophenweg 7a, 07743 Jena, Germany
| | - Benjamin Dietzek
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany and Department Functional Interfaces, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straβe 9, 07745 Jena, Germany. and Center for Energy and Environmental Chemistry Jena (CEEC Jena), Philosophenweg 7a, 07743 Jena, Germany
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3
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Puntoriero F, Arrigo A, Santoro A, Ganga GL, Tuyèras F, Campagna S, Dupeyre G, Lainé PP. Photoinduced Intercomponent Processes in Selectively Addressable Bichromophoric Dyads Made of Linearly Arranged Ru(II) Terpyridine and Expanded Pyridinium Components. Inorg Chem 2019; 58:5807-5817. [PMID: 31017774 DOI: 10.1021/acs.inorgchem.9b00139] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Three new linearly arranged bichromophoric systems 1-3 have been prepared, and their photophysical properties have been studied, taking also advantage of femtosecond pump-probe transient absorption spectroscopy. The three compounds contain the same chromophores, that is a Ru(II)-terpy-like species and a fused expanded bipyridinium (FEBP) unit, separated by three different, variously methylated biphenylene-type bridges. The chromophores have been selected to be selectively addressable, and excitation involving the Ru-based or the FEBP-based dyes results in different excited-state decays. Upon Ru-based excitation at 570 nm, oxidative photoinduced electron transfer (OPET) takes place in 1-3 from the 3MLCT state; however, the charge-separated species does not accumulate, indicating that the charge recombination rate constant exceeds the OPET rate constant. Upon excitation of the organic dye at 400 nm, the FEBP-based 1π-π* level is prepared, which undergoes a series of intercomponent decay events, including (i) electron-exchange energy transfer leading to the MLCT manifold (SS-EnT), which successively decays according to 570 nm excitation, and (ii) reductive photoinduced electron transfer (RPET), leading to the preparation of the charge-separated (CS) state. Reductive PET, involving the FEBP-based singlet state, is much faster than oxidative PET, involving the MLCT triplet state, essentially because of driving force reasons. The rate constant of CR is intermediate between the rate constants of OPET and RPET, and this makes 1-3 capable to selectively read the 400 nm excitation as an active input to prepare the CS state, whereas excitation at wavelengths longer than 480 nm is inefficient to accumulate the CS state. Moreover, intriguing differences between the rate constants of the various processes in 1-3 have been analyzed and interpreted according to the superexchange theory for electron transfer. This allowed us to uncover the role of the electron-transfer and hole-transfer superexchange pathways in promoting the various intercomponent photoinduced decay processes occurring in 1-3.
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Affiliation(s)
- Fausto Puntoriero
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences (CHIBIOFARAM) , University of Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLAR-CHEM, sezione di Messina) - viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Antonino Arrigo
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences (CHIBIOFARAM) , University of Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLAR-CHEM, sezione di Messina) - viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Antonio Santoro
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences (CHIBIOFARAM) , University of Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLAR-CHEM, sezione di Messina) - viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Giuseppina La Ganga
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences (CHIBIOFARAM) , University of Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLAR-CHEM, sezione di Messina) - viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Fabien Tuyèras
- Univ Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR CNRS 7086 , 15 rue J-A de Baïf , 75013 Paris , France
| | - Sebastiano Campagna
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences (CHIBIOFARAM) , University of Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLAR-CHEM, sezione di Messina) - viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Grégory Dupeyre
- Univ Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR CNRS 7086 , 15 rue J-A de Baïf , 75013 Paris , France
| | - Philippe P Lainé
- Univ Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR CNRS 7086 , 15 rue J-A de Baïf , 75013 Paris , France
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Heinz LG, Yushchenko O, Neuburger M, Vauthey E, Wenger OS. Tetramethoxybenzene is a Good Building Block for Molecular Wires: Insights from Photoinduced Electron Transfer. J Phys Chem A 2015; 119:5676-84. [DOI: 10.1021/acs.jpca.5b03649] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luisa G. Heinz
- Department
of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
| | - Oleksandr Yushchenko
- Department
of Physical Chemistry, University of Geneva, 30 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
| | - Markus Neuburger
- Department
of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
| | - Eric Vauthey
- Department
of Physical Chemistry, University of Geneva, 30 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
| | - Oliver S. Wenger
- Department
of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
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Karimata A, Suzuki S, Kozaki M, Kimoto K, Nozaki K, Matsushita H, Ikeda N, Akiyama K, Kosumi D, Hashimoto H, Okada K. Direct observation of hole shift and characterization of spin states in radical ion pairs generated from photoinduced electron transfer of (phenothiazine)(n)-anthraquinone (n = 1, 3) dyads. J Phys Chem A 2014; 118:11262-71. [PMID: 25347200 DOI: 10.1021/jp509643q] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Photoinduced intramolecular electron transfer of dyad PTZ3-PTZ2-PTZ1-B-AQ consisting of phenothiazine trimer (PTZ3-PTZ2-PTZ1), bicyclo[2.2.2]octane (B), and anthraquinone (AQ) was investigated. After excitation (∼20 ps) of the AQ moiety in THF, a metastable radical ion pair (RIP) PTZ3-PTZ2-PTZ1(+)-B-AQ(-) appeared at ∼620 nm. From 500 ps to 6 ns the spectrum changed to a new absorption (∼950 nm), which was assigned to the hole-shifted stable RIP state PTZ3-PTZ2(+)-PTZ1-B-AQ(-). The time constant of the hole-shift process was determined to be 6.0 ns. The hole-shifted RIP state had a lifetime (τ) of 250 ns and was characterized by spin-polarized signals as a spin-correlated radical pair (SCRP) by means of time-resolved ESR. These results were compared with those for the phenothiazine monomer analog PTZ-B-AQ, which also produced the RIP state PTZ(+)-B-AQ(-) with τ = 1.9 μs. Time-resolved ESR showed an all emission signal pattern showing the triplet mechanism of PTZ-B-(3)AQ* → (3)[PTZ(+)-B-AQ(-)]. The origin of the difference in the lifetimes between the trimer and the monomer RIP states was discussed from various points of view, including free energy difference in the RIP states, reorganization energy difference in the charge recombination process, and the spin-state difference. Of these, the spin-state difference effect provided the most reasonable explanation.
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Affiliation(s)
- Ayumu Karimata
- Department of Chemistry, Graduate School of Science and ⊥Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University , Sumiyoshi-ku, Osaka, 558-8585, Japan
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Hankache J, Niemi M, Lemmetyinen H, Wenger OS. Hydrogen-Bonding Effects on the Formation and Lifetimes of Charge-Separated States in Molecular Triads. J Phys Chem A 2012; 116:8159-68. [DOI: 10.1021/jp302790j] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Jihane Hankache
- Institut für Anorganische
Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Marja Niemi
- Department of Chemistry and
Bioengineering, Tampere University of Technology, P.O. Box 541, FIN-33101 Tampere, Finland
| | - Helge Lemmetyinen
- Department of Chemistry and
Bioengineering, Tampere University of Technology, P.O. Box 541, FIN-33101 Tampere, Finland
| | - Oliver S. Wenger
- Institut für Anorganische
Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
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Hankache J, Niemi M, Lemmetyinen H, Wenger OS. Photoinduced Electron Transfer in Linear Triarylamine–Photosensitizer–Anthraquinone Triads with Ruthenium(II), Osmium(II), and Iridium(III). Inorg Chem 2012; 51:6333-44. [DOI: 10.1021/ic300558s] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Jihane Hankache
- Georg-August-Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077
Göttingen, Germany
| | - Marja Niemi
- Tampere University of Technology, Department
of Chemistry and Bioengineering, P.O. Box 541, FIN-33101 Tampere,
Finland
| | - Helge Lemmetyinen
- Tampere University of Technology, Department
of Chemistry and Bioengineering, P.O. Box 541, FIN-33101 Tampere,
Finland
| | - Oliver S. Wenger
- Georg-August-Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077
Göttingen, Germany
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He B, Wenger OS. Ruthenium-Phenothiazine Electron Transfer Dyad with a Photoswitchable Dithienylethene Bridge: Flash-Quench Studies with Methylviologen. Inorg Chem 2012; 51:4335-42. [DOI: 10.1021/ic300048r] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Bice He
- Georg-August-Universität, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077
Göttingen, Germany
| | - Oliver S. Wenger
- Georg-August-Universität, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077
Göttingen, Germany
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Hankache J, Hanss D, Wenger OS. Hydrogen-Bond Strengthening upon Photoinduced Electron Transfer in Ruthenium–Anthraquinone Dyads Interacting with Hexafluoroisopropanol or Water. J Phys Chem A 2012; 116:3347-58. [DOI: 10.1021/jp300090n] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jihane Hankache
- Georg-August-Universität, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077
Göttingen, Germany
| | - David Hanss
- Georg-August-Universität, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077
Göttingen, Germany
| | - Oliver S. Wenger
- Georg-August-Universität, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077
Göttingen, Germany
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Hankache J, Wenger OS. Photoinduced electron transfer in covalent ruthenium–anthraquinone dyads: relative importance of driving-force, solvent polarity, and donor–bridge energy gap. Phys Chem Chem Phys 2012; 14:2685-92. [DOI: 10.1039/c2cp23240e] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Schmidt HC, Reuter LG, Hamacek J, Wenger OS. Multistage complexation of fluoride ions by a fluorescent triphenylamine bearing three dimesitylboryl groups: controlling intramolecular charge transfer. J Org Chem 2011; 76:9081-5. [PMID: 21995637 DOI: 10.1021/jo2019152] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A propeller-shaped boron-nitrogen compound (NB(3)) with three binding sites for fluoride anions was synthesized and investigated by optical absorption, luminescence, and ((1)H, (11)B, (13)C, (19)F) NMR spectroscopy. Binding of fluoride in dichloromethane solution occurs in three clearly identifiable steps and leads to stepwise blocking of the three initially present nitrogen-to-boron charge transfer pathways. As a consequence, the initially bright blue charge transfer emission is red-shifted and decreases in intensity, until it is quenched completely in presence of large fluoride excess. Fluoride binding constants were determined from global fits to optical absorption and luminescence titration data and were found to be K(a1) = 4 × 10(7) M(-1), K(a2) = 2.5 × 10(6) M(-1), and K(a3) = 3.2 × 10(4) M(-1) in room temperature dichloromethane solution. Complexation of fluoride to a given dimesitylboryl site increases the electron density at the central nitrogen atom of NB(3), and this leads to red shifts of the remaining nitrogen-to-boron charge transfer transitions involving yet unfluorinated dimesitylboryl groups.
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Affiliation(s)
- Hauke C Schmidt
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
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