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López-Carballeira D, Polcar T. High throughput selection of organic cathode materials. J Comput Chem 2024; 45:264-273. [PMID: 37800977 DOI: 10.1002/jcc.27236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 09/12/2023] [Accepted: 09/19/2023] [Indexed: 10/07/2023]
Abstract
Efficient and affordable batteries require the design of novel organic electrode materials to overcome the drawbacks of the traditionally used inorganic materials, and the computational screening of potential candidates is a very efficient way to identify prospective solutions and minimize experimental testing. Here we present a DFT high-throughput computational screening where 86 million molecules contained in the PUBCHEM database have been analyzed and classified according to their estimated electrochemical features. The 5445 top-performing candidates were identified, and among them, 2306 are expected to have a one-electron reduction potential higher than 4 V versus (Li/Li+ ). Analogously, one-electron energy densities higher than 800 Whkg-1 have been predicted for 626 molecules. Explicit calculations performed for certain materials show that at least 69 candidates with a two-electron energy density higher than 1300 Whkg-1 . Successful molecules were sorted into several families, some of them already commonly used electrode materials, and others still experimentally untested. Most of them are small systems containing conjugated CO, NN, or NC functional groups. Our selected molecules form a valuable starting point for experimentalists exploring new materials for organic electrodes.
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Affiliation(s)
- Diego López-Carballeira
- Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Prague, Czech Republic
| | - Tomáš Polcar
- Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Prague, Czech Republic
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2
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Li F, Wang C, Xu Y, Gao X, Xu Y, Xie H, Chen P, Wang L. Lipase‐Catalyzed Synthesis of Anthrone Functionalized Benzylic Amines via a Multicomponent Reaction in Supercritical Carbon Dioxide. ChemistrySelect 2022. [DOI: 10.1002/slct.202104517] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Fengxi Li
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education School of Life Sciences Jilin University Changchun 130023 P. R. China
| | - Ciduo Wang
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education School of Life Sciences Jilin University Changchun 130023 P. R. China
| | - Yaning Xu
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education School of Life Sciences Jilin University Changchun 130023 P. R. China
| | - Xiaojun Gao
- Affiliated Hospital of Yanbian University Yan Ji, Yanji 133000(P. R. China
| | - Yuelin Xu
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education School of Life Sciences Jilin University Changchun 130023 P. R. China
| | - Hanqing Xie
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education School of Life Sciences Jilin University Changchun 130023 P. R. China
| | - Peng Chen
- The Second Hospital of Jilin UniversityChangchun Jilin University Changchun 130041 P. R. China
| | - Lei Wang
- Key Laboratory of Molecular Enzymology and Engineering of Ministry of Education School of Life Sciences Jilin University Changchun 130023 P. R. China
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Aoki S, Tsurumaki E, Yamashina M, Wakamatsu K, Toyota S. Structure and Photophysical Properties of 1,1,2,2-Tetra(1-anthryl)ethane: A C(sp 3 )-C(sp 3 ) Bond Substituted with Four Anthracene Units. Chempluschem 2021; 87:e202100447. [PMID: 34811962 DOI: 10.1002/cplu.202100447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 11/03/2021] [Indexed: 11/07/2022]
Abstract
The title aromatic compound comprising four anthracene units was synthesized by the McMurry coupling of di(1-anthryl) ketone as a hydrogenated product in 65 % yield. The molecule forms a C2 symmetric structure with the ap conformation about the C(sp3 )-C(sp3 ) single bond, as revealed by X-ray analysis and DFT calculations. The UV/vis and fluorescence spectra of this compound were compared with those of anthracene, di(1-anthryl)methane, and 1,2-di(1-anthryl)ethane. The fluorescence spectrum showed a broad emission band at 450 nm having a long lifetime at 21 ns, which was assignable to an excimer-type emission, in contrast to the other reference compounds. The characteristic photophysical property is discussed in terms of the molecular structure with the aid of the noncovalent interaction plots and the conformational analysis.
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Affiliation(s)
- Shu Aoki
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Eiji Tsurumaki
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Masahiro Yamashina
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Kan Wakamatsu
- Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama, 700-0005, Japan
| | - Shinji Toyota
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan
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Das S, Bhowmik A, Sarkar W, Mishra A, Deb I. Straightforward Access to Anthrone Functionalized Benzylic Amines via Organocatalytic 1,2-Addition of Anthrones to Imines at Ambient Temperature. J Org Chem 2021; 86:4131-4142. [PMID: 33620226 DOI: 10.1021/acs.joc.0c02959] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Activation of anthrone via benzylic deprotonation in the presence of triethylamine paves the way for the 1,2-addition reaction with imines to provide the desired functionalized anthrones in good to excellent yields under mild and operationally simple reaction conditions with a broad range of substrate scopes without using any external additives or toxic stoichiometric reagents.
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Affiliation(s)
- Sumit Das
- Organic and Medicinal Chemistry Division, CSIR - Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201002, India
| | - Arup Bhowmik
- Organic and Medicinal Chemistry Division, CSIR - Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Writhabrata Sarkar
- Organic and Medicinal Chemistry Division, CSIR - Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Aniket Mishra
- Organic and Medicinal Chemistry Division, CSIR - Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Indubhusan Deb
- Organic and Medicinal Chemistry Division, CSIR - Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
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Yang X, Jin X, Zhang MX, Yin J, Liu SH. Synthesis and properties of contorted hexabenzocoronenes with arylamino groups. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131106] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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6
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Chen YH, Sung R, Sung K. Dramatic changes in the excited-state behaviour of the green fluorescent protein chromophore by a strong π-donating group through significantly lowering the excited-state potential energy surface with photoinduced intramolecular charge transfer. Phys Chem Chem Phys 2020; 22:2424-2428. [PMID: 31939956 DOI: 10.1039/c9cp06231a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A strong π-donating group like p-NMe2 dramatically changes the excited-state behavior of the green fluorescent protein (GFP) chromophore, such as realizing charge-transfer absorption and executing significant photoinduced intramolecular charge transfer (ICT), which makes a planar first singlet (S1) excited-state minimum disappear and significantly lowers the S1 excited-state potential energy surface (PES), leading to barrierless τ-torsion and φ-torsion excited-state relaxation and eliciting the φ-torsion S1 excited-state minimum. This finding is critical since a strong π-donating group like p-NMe2 may do the same things to other fluorophores.
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Affiliation(s)
- Yi-Hui Chen
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan, Republic of China.
| | - Robert Sung
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan, Republic of China.
| | - Kuangsen Sung
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan, Republic of China.
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Levchenko KS, Chudov KA, Demin DY, Adamov GE, Zinoviev EV, Lyssenko KA, Shokurov AV, Shmelin PS, Grebennikov EP. New chromophores based on 2-(4-vinylchromen-2-ylidene)malononitrile and 2-(2-vinylchromen-4-ylidene)malononitrile. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2641-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Belyaev A, Chen Y, Liu Z, Hindenberg P, Wu C, Chou P, Romero‐Nieto C, Koshevoy IO. Intramolecular Phosphacyclization: Polyaromatic Phosphonium P-Heterocycles with Wide-Tuning Optical Properties. Chemistry 2019; 25:6332-6341. [PMID: 30791177 PMCID: PMC6594060 DOI: 10.1002/chem.201900136] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Indexed: 01/08/2023]
Abstract
Rationally designed cationic phospha-polyaromatic fluorophores were prepared through intramolecular cyclization of the tertiary ortho-(acene)phenylene-phosphines mediated by CuII triflate. As a result of phosphorus quaternization, heterocyclic phosphonium salts 1 c-3 c, derived from naphthalene, phenanthrene, and anthracene cores, exhibited very intense blue to green fluorescence (Φem =0.38-0.99) and high photostability in aqueous medium. The structure-emission relationship was further investigated by tailoring the electron-donating functions to the anthracene moiety to give dyes 4 c-6 c with charge-transfer character. The latter significantly decreases the emission energy to reach near-IR region. Thus, the intramolecular phosphacyclization renders an ultra-wide tuning of fluorescence from 420 nm (1 c) to 780 nm (6 c) in solution, extended to 825 nm for 6 c in the solid state with quantum efficiency of approximately 0.07. The physical behavior of these new dyes was studied spectroscopically, crystallographically, and electrochemically, whereas computational analysis was used to correlate the experimental data with molecular electronic structures. The excellent stability, water solubility, and attractive photophysical characteristics make these phosphonium heterocycles powerful tools in cell imaging.
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Affiliation(s)
- Andrey Belyaev
- Department of ChemistryUniversity of Eastern FinlandYliopistokatu 780101JoensuuFinland
| | - Yi‐Ting Chen
- Department of ChemistryNational (Taiwan) UniversityTaipei106Taiwan
| | - Zong‐Ying Liu
- Department of ChemistryNational (Taiwan) UniversityTaipei106Taiwan
| | - Philip Hindenberg
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Cheng‐Ham Wu
- Department of ChemistryNational (Taiwan) UniversityTaipei106Taiwan
| | - Pi‐Tai Chou
- Department of ChemistryNational (Taiwan) UniversityTaipei106Taiwan
| | - Carlos Romero‐Nieto
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
- Faculty of PharmacyUniversity of Castilla-La ManchaCalle Almansa 14 - Edif. Bioincubadora02008AlbaceteSpain
| | - Igor O. Koshevoy
- Department of ChemistryUniversity of Eastern FinlandYliopistokatu 780101JoensuuFinland
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Fang JK, Hu X, Xu M, Wang H, Zhang Y, Jin C, Zhong X. Molecular Engineering of Efficient Organic Sensitizers Containing Diyne-Bridge for Dye-Sensitized Solar Cells. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.09.098] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Kapturkiewicz A. Electrochemical Generation of Excited Intramolecular Charge-Transfer States. ChemElectroChem 2017. [DOI: 10.1002/celc.201600865] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Andrzej Kapturkiewicz
- Institute of Chemistry, Faculty of Sciences; Siedlce University of Natural Sciences and Humanities; 3 Maja 54 08-110 Siedlce Poland
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11
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Substituent Effects on Regioselectivity of the Diels-Alder Reactions: Reactions of 10-Allyl-1,8-dichloroanthracene with 2-Chloroacrylonitrile, 1-Cyanovinyl Acetate and Phenyl Vinyl Sulfone. J CHEM-NY 2016. [DOI: 10.1155/2016/3943060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Diels-Alder reaction of 10-allyl-1,8-dichloroanthracene (3) with 2-chloroacrylonitrile (4) and 1-cyanovinyl acetate (5) gives exclusively theorthoisomer while its reaction with phenyl vinyl sulfone (10) yields a mixture of two isomeric adducts with priority toorthoisomer. The reactions proceeded under microwave condition in xylene. Configurations of these isomers have been assigned with the help of NMR spectra. The results indicated that the steric effect is dominating toward the isomer regioselectivity in the Diels-Alder reaction of the present compounds.
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Ceban V, Tauchman J, Meazza M, Gallagher G, Light ME, Gergelitsová I, Veselý J, Rios R. Expanding the scope of Metal-Free enantioselective allylic substitutions: Anthrones. Sci Rep 2015; 5:16886. [PMID: 26592555 PMCID: PMC4655356 DOI: 10.1038/srep16886] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 10/19/2015] [Indexed: 11/09/2022] Open
Abstract
The highly enantioselective asymmetric allylic alkylation of Morita–Baylis–Hillman carbonates with anthrones is presented. The reaction is simply catalyzed by cinchona alkaloid derivatives affording the final alkylated products in good yields and excellent enantioselectivities.
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Affiliation(s)
- Victor Ceban
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| | - Jiří Tauchman
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK.,Department of Organic Chemistry, Charles University in Prague, 128 43 Praha 2, Czech Republic
| | - Marta Meazza
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| | - Greg Gallagher
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| | - Mark E Light
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| | - Ivana Gergelitsová
- Department of Organic Chemistry, Charles University in Prague, 128 43 Praha 2, Czech Republic
| | - Jan Veselý
- Department of Organic Chemistry, Charles University in Prague, 128 43 Praha 2, Czech Republic
| | - Ramon Rios
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
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Diaw AKD, Gningue-Sall D, Yassar A, Brochon JC, Henry E, Aaron JJ. An experimental study of the electronic absorption and fluorescence spectral properties of new p-substituted-N-phenylpyrroles and their electrosynthesized polymers. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 135:1107-1114. [PMID: 25173528 DOI: 10.1016/j.saa.2014.07.063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 07/13/2014] [Accepted: 07/22/2014] [Indexed: 06/03/2023]
Abstract
Electronic absorption and fluorescence spectral properties of new p-substituted-N-phenylpyrroles (N-PhPys), including HOPhPy, MeOPhPy, ThPhPy, PhDPy, DPhDPy, PyPhThThPhPy, and their available, electrosynthesized polymers were investigated. Electronic absorption spectra, fluorescence excitation and emission spectra, fluorescence quantum yields (ΦF) and lifetimes (τF), and other photophysical parameters of these N-PhPy derivatives and their polymers were measured in DMF, DMSO diluted solutions and/or solid state at room temperature. The electronic absorption spectra of N-PhPy derivatives and their polymers included one to several bands, located in the 270-395 nm region, according to the p-phenyl substituent electron-donating effect and conjugated heteroaromatic system length. The fluorescence excitation spectra were characterized by one broad main peak, with, in most cases, one (or more) poorly resolved shoulder (s), appearing in the 270-405 nm region, and their emission spectra were generally constituted of several bands located in the 330-480 nm region. No significant shift of the absorption, fluorescence excitation and emission spectra wavelengths was found upon going from the monomers to the corresponding polymers. ΦF values were high, varying between 0.11 and 0.63, according to the nature of substituents(s) and to the conjugated system extension. Fluorescence decays were mono-exponential for the monomers and poly-exponential for PyPhThThPhPy and for polymers. τF values were relatively short (0.35-5.17 ns), and markedly decreased with the electron-donor character of the phenyl group p-substituent and the conjugated system extension.
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Affiliation(s)
- A K D Diaw
- Laboratoire de Chimie Physique Organique et d'Analyse Instrumentale, Département de Chimie, Faculté des Sciences, Université Cheikh Anta Diop, BP 5005 Dakar-Fann, Senegal
| | - D Gningue-Sall
- Laboratoire de Chimie Physique Organique et d'Analyse Instrumentale, Département de Chimie, Faculté des Sciences, Université Cheikh Anta Diop, BP 5005 Dakar-Fann, Senegal
| | - A Yassar
- LPICM (UMR 7647), Ecole Polytechnique, Route de Saclay, 91128 Palaiseau, France
| | - J-C Brochon
- LBPA-CNRS UMR 8113, ENS Cachan, 61 Av Président Wilson, 94235 Cachan, France
| | - E Henry
- LBPA-CNRS UMR 8113, ENS Cachan, 61 Av Président Wilson, 94235 Cachan, France
| | - J-J Aaron
- Laboratoire Géomatériaux et Environnement (LGE), Université Paris-Est Marne-la-Vallée, 5 Bd Descartes, Champs-sur-Marne, 77454 Marne la Vallée Cedex 2, France.
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Samori S, Tojo S, Fujitsuka M, Lin JH, Ho TI, Yang JS, Majima T. Emission from Charge Recombination between Radical Cations and Radical Anions of 9-Cyano-10-(p-Substituted Phenyl)Anthracene Generated during Pulse Radiolysis. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200600164] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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15
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Bai JF, Guo YL, Peng L, Jia LN, Xu XY, Wang LX. Enantioselective Diels–Alder reaction of anthrone and maleimide catalyzed by a simple chiral tertiary amine. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.11.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Lee YO, Pradhan T, No K, Kim JS. N,N-Dimethylaniline and 1-(trifluoromethyl)benzene-functionalized tetrakis(ethynyl)pyrenes: synthesis, photophysical, electrochemical and computational studies. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.12.066] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Serrano CM, Looper RE. Synthesis of Cytimidine through a One-Pot Copper-Mediated Amidation Cascade. Org Lett 2011; 13:5000-3. [DOI: 10.1021/ol2018196] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Catherine M. Serrano
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Ryan E. Looper
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
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Sun HW, Liao YH, Wu ZJ, Wang HY, Zhang XM, Yuan WC. Enantioselective 1,6-Michael addition of anthrone to 3-methyl-4-nitro-5-alkenyl-isoxazoles catalyzed by bifunctional thiourea-tertiary amines. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.04.032] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Mathew S, Imahori H. Tunable, strongly-donating perylene photosensitizers for dye-sensitized solar cells. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10993f] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Synthesis and spectroelectrochemical properties of two new dithienylpyrroles bearing anthraquinone units and their polymer films. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.07.012] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Park YH, Kim YH, Kwon SK, Koo IS, Yang KY. Theoretical Studies on Dicyanoanthracenes as Organic Semiconductor Materials: Reorganization Energy. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.6.1649] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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22
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Zea A, Valero G, Alba AN, Moyano A, Rios R. Bifunctional Thiourea-Catalyzed Asymmetric Addition of Anthrones to Maleimides. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000031] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Kim SH, Kim SH, Kim KH, Kim JN. Synthesis of 10-Arylanthracenes from 2-Fluorobenzophenones and Arylacetonitriles via a One-Pot SN. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.03.708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Blanc S, Pigot T, Cugnet C, Brown R, Lacombe S. A new cyanoaromatic photosensitizer vs. 9,10-dicyanoanthracene: systematic comparison of the photophysical properties. Phys Chem Chem Phys 2010; 12:11280-90. [DOI: 10.1039/c002705g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Lacombe S, Soumillion JP, El Kadib A, Pigot T, Blanc S, Brown R, Oliveros E, Cantau C, Saint-Cricq P. Solvent-free production of singlet oxygen at the gas-solid interface: visible light activated organic-inorganic hybrid microreactors including new cyanoaromatic photosensitizers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:11168-11179. [PMID: 19735158 DOI: 10.1021/la901504q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We synthesized new cyanoaromatics, benzo[b]triphenylene-9,14-dicarbonitrile (DBTP) 1a and a graftable derivative, 9,14-dicyanobenzo[b]triphenylene-3-carboxylic acid (DBTP-COOH) 1b, easily prepared from commercial reagents. Their photosensitizing properties were investigated. Hybrid porous silica monoliths loaded with encapsulated 1a or grafted 1b were prepared, and their adsorption, spectroscopic and photosensitizing properties, as well as stability, were compared. Solvent-free, efficient oxidation of dimethylsulfide (DMS) was observed at the gas-solid interface under visible light irradiation. Quantum yields of formation of 1O2 inside the porous monoliths are comparable to those of phenalenone. Singlet oxygen lifetimes (approximately 25 micros) were found to be longer in silica monoliths than in usual polar solvents such as methanol or ethanol. This new class of hybrid materials work as porous, transparent, and highly efficient microreactors for oxidation reactions under visible light.
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Affiliation(s)
- Sylvie Lacombe
- CNRS, Université de Pau, IPREM-UMR 5254, Helioparc, 2 rue du President Angot, BP 64053, Pau cedex 9, France.
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Samori S, Tojo S, Fujitsuka M, Majima T. Important factors for the radiolysis-induced emission intensity of aromatic hydrocarbons. J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2009.05.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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An Z, Odom SA, Kelley RF, Huang C, Zhang X, Barlow S, Padilha LA, Fu J, Webster S, Hagan DJ, Van Stryland EW, Wasielewski MR, Marder SR. Synthesis and Photophysical Properties of Donor- and Acceptor-Substituted 1,7-Bis(arylalkynyl)perylene-3,4:9,10-bis(dicarboximide)s. J Phys Chem A 2009; 113:5585-93. [DOI: 10.1021/jp900152r] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zesheng An
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Susan A. Odom
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Richard F. Kelley
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Chun Huang
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Xuan Zhang
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Stephen Barlow
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Lazaro A. Padilha
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Jie Fu
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Scott Webster
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - David J. Hagan
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Eric W. Van Stryland
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Michael R. Wasielewski
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
| | - Seth R. Marder
- School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208-3113, and CREOL & FPCE, The College of Optics and Photonics and Department of Physics, University of Central Florida, Orlando, Florida 32816-2700
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Samori S, Tojo S, Fujitsuka M, Ryhding T, Fix AG, Armstrong BM, Haley MM, Majima T. Emission from Regioisomeric Bis(phenylethynyl)benzenes during Pulse Radiolysis. J Org Chem 2009; 74:3776-82. [DOI: 10.1021/jo900494j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shingo Samori
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan, and Department of Chemistry and the Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253
| | - Sachiko Tojo
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan, and Department of Chemistry and the Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253
| | - Mamoru Fujitsuka
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan, and Department of Chemistry and the Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253
| | - Torben Ryhding
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan, and Department of Chemistry and the Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253
| | - Aaron G. Fix
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan, and Department of Chemistry and the Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253
| | - Brittany M. Armstrong
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan, and Department of Chemistry and the Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253
| | - Michael M. Haley
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan, and Department of Chemistry and the Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253
| | - Tetsuro Majima
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan, and Department of Chemistry and the Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253
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29
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Patra A, Radhakrishnan T. Molecular Materials with Contrasting Optical Responses from a Single-Pot Reaction and Fluorescence Switching in a Carbon Acid. Chemistry 2009; 15:2792-800. [DOI: 10.1002/chem.200801878] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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Ma X, Ma F, Zhao Z, Song N, Zhang J. Synthesis and properties of NLO chromophores with fine-tuned gradient electronic structures. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b817789a] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Butler RS, Cohn P, Tenzel P, Abboud KA, Castellano RK. Synthesis, Photophysical Behavior, and Electronic Structure of Push−Pull Purines. J Am Chem Soc 2008; 131:623-33. [DOI: 10.1021/ja806348z] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roslyn S. Butler
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Pamela Cohn
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Phillip Tenzel
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Khalil A. Abboud
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Ronald K. Castellano
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
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32
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Yang JS, Huang HH, Ho JH. Electronic Properties of Star-Shaped Oligofluorenes Containing an Isotruxene Core: Interplay of Para and Ortho Conjugation Effects in Phenylene-Based π Systems. J Phys Chem B 2008; 112:8871-8. [DOI: 10.1021/jp800448p] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jye-Shane Yang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
| | - Hsin-Hau Huang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
| | - Jinn-Hsuan Ho
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
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33
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Speelman AL, Gillmore JG. Efficient Computational Methods for Accurately Predicting Reduction Potentials of Organic Molecules. J Phys Chem A 2008; 112:5684-90. [DOI: 10.1021/jp800782e] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amy L. Speelman
- Department of Chemistry, Hope College, 35 E. 12th St., Holland, Michigan 49422-9000
| | - Jason G. Gillmore
- Department of Chemistry, Hope College, 35 E. 12th St., Holland, Michigan 49422-9000
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34
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Samori S, Tojo S, Fujitsuka M, Spitler EL, Haley MM, Majima T. Fine-Tuning of Radiolysis Induced Emission by Variable Substitution of Donor-/Acceptor-Substituted Tetrakis(arylethynyl)benzenes. J Org Chem 2008; 73:3551-8. [DOI: 10.1021/jo8001535] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shingo Samori
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
| | - Sachiko Tojo
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
| | - Mamoru Fujitsuka
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
| | - Eric L. Spitler
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
| | - Michael M. Haley
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
| | - Tetsuro Majima
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
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35
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Sung K, Huang PM, Zhou CH. Hydroquinone-benzonitrile system: intramolecular charge-transfer and computational studies. J Fluoresc 2007; 17:492-9. [PMID: 17629718 DOI: 10.1007/s10895-007-0199-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2007] [Accepted: 05/03/2007] [Indexed: 10/23/2022]
Abstract
A novel intramolecular donor-acceptor system of hydroquinone-benzonitrile was synthesized. Its photo-induced intramolecular charge-transfer (ICT) transition was confirmed by (1) shift of its emission maximum with increasing solvent polarity, (2) high dipole moment for the ICT excited state calculated from the Lippert equation, and (3) its HOMO and LUMO. According to the extent of separation between HOMO and LUMO, it is suggested that substituent position (ortho, meta, or para) in the donor-acceptor biphenyls is not a key point for the photo-induced intramolecular charge transfer and the donor with two alkoxy or hydroxy groups has more photo-induced charge transfer transitions than the one with one alkoxy or hydroxy group. In other words, the hydroquinone-benzonitrile system displays more photo-induced charge transfer transitions than 4COB (4-cyano-4'-butyloxybiphenyl).
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Affiliation(s)
- Kuangsen Sung
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan.
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Samori S, Tojo S, Fujitsuka M, Spitler EL, Haley MM, Majima T. Donor−Acceptor-Substituted Tetrakis(phenylethynyl)benzenes as Emissive Molecules during Pulse Radiolysis in Benzene. J Org Chem 2007; 72:2785-93. [PMID: 17367190 DOI: 10.1021/jo062326h] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Emission from charge recombination between radical cations and anions of various tetrakis(phenylethynyl)benzenes (TPEBs) was measured during pulse radiolysis in benzene (Bz). The formation of TPEB in the singlet excited state (1TPEB*) can be attributed to the charge recombination between TPEB*+ and TPEB*-, which are initially generated from the radiolytic reaction in Bz. This mechanism is reasonably explained by the relationship between the annihilation enthalpy change (-DeltaH degrees) for the charge recombination of TPEB*+ and TPEB*- and excitation energy of 1TPEB*. It was found that the charge recombination between TPEB*+ and TPEB*- occurred to give 1TPEB* as the emissive species, but not the excimers because of the large repulsion between substituents caused by the rotation around C-C single bonds of TPEBs. Since donor-acceptor-substituted TPEBs possess three types of charge-transfer pathways (linear-conjugated, cross-conjugated, and "bent" conjugated pathways between the donor and acceptor substituents through the ethynyl linkage), the emission spectra of 1TPEBs* with intramolecular charge transfer (ICT) character depend on the substitution pattern and the various kinds of donor and acceptor groups during pulse radiolysis in Bz.
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Affiliation(s)
- Shingo Samori
- The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
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37
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Ha-Thi MH, Souchon V, Hamdi A, Métivier R, Alain V, Nakatani K, Lacroix PG, Genêt JP, Michelet V, Leray I. Synthesis of Novel Rod-Shaped and Star-Shaped Fluorescent Phosphane Oxides—Nonlinear Optical Properties and Photophysical Properties. Chemistry 2006; 12:9056-65. [PMID: 16955525 DOI: 10.1002/chem.200600464] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The design of a new class of fluorophores is presented. Some push-pull chromophores (D-pi-A) containing polyphenylethynyl units and a phosphane oxide moiety were efficiently prepared from common intermediates. Straightforward syntheses gave novel one-armed, rod-shaped and three-armed, star-shaped fluorophores. The optical properties of the resulting star-shaped derivatives were evaluated, showed high fluorescence quantum yields, and their excitation induces very efficient charge redistribution. Moreover, thanks to their push-pull character, the molecules exhibited significant second-order NLO properties with good transparency, up to 67x10(-30) esu at 1907 nm, with an absorption lambdamax at 369 nm. The effect of the donor group and of the number of phenylethynyl arms have been studied in this work.
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Affiliation(s)
- Minh-Huong Ha-Thi
- CNRS UMR 8531 Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires, Département de Chimie, ENS-Cachan, 61 avenue du Président Wilson, 94235 Cachan Cedex, France
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38
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Samori S, Tojo S, Fujitsuka M, Liang HJ, Ho TI, Yang JS, Majima T. Emission from Charge Recombination during the Pulse Radiolysis of 9-Cyano-10-phenylethynylanthracenes with Donor and Acceptor Substituents. J Org Chem 2006; 71:8732-9. [PMID: 17081000 DOI: 10.1021/jo060929n] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Emission from 9-cyano-10-phenylanthracene and 9-cyano-10-phenylethynylanthracenes having donor and acceptor substituents (RA = PA, PEA, OEA, NEA, and DEA) was studied with the time-resolved fluorescence measurement during the pulse radiolysis of RAs in benzene (Bz). PA and DEA showed only monomer emission, while other RAs (PEA, OEA, and NEA) showed both monomer and excimer emissions with much lower intensities. On the basis of the steady-state and transient absorption and emission measurements, the formation of RA in the singlet excited state ((1)RA*) can be attributed to the charge recombination between RA radical cation and anion (RA*+ and RA*-, respectively) which are initially generated from the radiolytic reaction in Bz. It is expected that for PA with a twisted geometry, the charge recombination between PA*+ and PA*- occurs to give (1)PA* during the pulse radiolysis in Bz. For PEA and OEA, pi-stacking interaction is possible for the formation of an encounter complex during the charge recombination between RA*+ and RA*-. For NEA, it is expected that NEA*+ and NEA*- collide neck-to-neck to generate the excimer due to the twisted geometry. For DEA, a considerably twisted structure is assumed to give (1)DEA* with strong ICT character but not (1)(DEA)2* because of the bulky donor substituent.
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Affiliation(s)
- Shingo Samori
- Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan
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