1
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Waluk J. Coupling between tautomerism and radiationless deactivation in porphycenes. PURE APPL CHEM 2023. [DOI: 10.1515/pac-2022-1107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
Abstract
Quantum yields of fluorescence of porphycenes – porphyrin isomers – can vary by orders of magnitude, even for very similar derivatives, such as meso-dimethyl- vs. meso-tetramethylporphycene. In weakly emitting porphycenes the fluorescence intensity strongly depends on viscosity and can be recovered by placing a molecule in a rigid environment. We postulate that the efficient nonradiative deactivation is due to the quantum effect, delocalization of the inner protons. The delocalization, which increases with the strength of intramolecular hydrogen bonds may induce structural changes that lead to distortion from planarity and, as a result, efficient S0 ← S1 internal conversion. The effect seems to be general, as indicated by good correlation between the quantum yield of fluorescence and the distance between H-bonded nitrogen atoms, the latter being a reliable measure of hydrogen bonding strength. Based on the available photophysical and X-ray data, such correlation was found so far for over 20 differently substituted porphycenes.
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Affiliation(s)
- Jacek Waluk
- Institute of Physical Chemistry, Polish Academy of Sciences , Kasprzaka 44/52, 01-224 Warsaw , Poland
- Faculty of Mathematics and Science, Cardinal Stefan Wyszyński University , Dewajtis 5, 01-815 Warsaw , Poland
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2
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Capaldo L, Ravelli D, Fagnoni M. Direct Photocatalyzed Hydrogen Atom Transfer (HAT) for Aliphatic C-H Bonds Elaboration. Chem Rev 2021; 122:1875-1924. [PMID: 34355884 PMCID: PMC8796199 DOI: 10.1021/acs.chemrev.1c00263] [Citation(s) in RCA: 357] [Impact Index Per Article: 119.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
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Direct photocatalyzed
hydrogen atom transfer (d-HAT) can be considered
a method of choice for the elaboration of
aliphatic C–H bonds. In this manifold, a photocatalyst (PCHAT) exploits the energy of a photon to trigger the homolytic
cleavage of such bonds in organic compounds. Selective C–H
bond elaboration may be achieved by a judicious choice of the hydrogen
abstractor (key parameters are the electronic character and the molecular
structure), as well as reaction additives. Different are the classes
of PCsHAT available, including aromatic ketones, xanthene
dyes (Eosin Y), polyoxometalates, uranyl salts, a metal-oxo porphyrin
and a tris(amino)cyclopropenium radical dication. The processes (mainly
C–C bond formation) are in most cases carried out under mild
conditions with the help of visible light. The aim of this review
is to offer a comprehensive survey of the synthetic applications of
photocatalyzed d-HAT.
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Affiliation(s)
- Luca Capaldo
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Davide Ravelli
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
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3
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Kato SI, Kijima T, Shiota Y, Abe T, Kuwako S, Miyauchi H, Yoshikawa N, Yamamoto K, Yoshizawa K, Yoshihara T, Tobita S, Nakamura Y. Chemical transformations of push-pull fluorenones: push-pull dibenzodicyanofulvenes as well as fluorenone- and dibenzodicyanofulvene-tetracyanobutadiene conjugates. Org Biomol Chem 2020; 18:4198-4209. [PMID: 32191251 DOI: 10.1039/c9ob02706h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Push-pull fluorenones (FOs) were synthesized by treating a benzopentalenequinone (BPO) derivative with alkynes that bear an electron-rich aniline moiety via a regioselective [4 + 2] cycloaddition (CA) followed by a [4 + 1] retrocycloaddition (RCA). The resulting FOs were readily converted into dibenzodicyanofulvenes (DBDCFs) by treatment with malononitrile in the presence of TiCl4 and pyridine. The FOs and DBDCFs exhibit intramolecular charge-transfer (ICT) that manifests in absorptions at 350-650 nm and amphoteric electrochemical behavior. Furthermore, FOs and DBDCFs that contain a C[triple bond, length as m-dash]C bond react with tetracyanoethylene in a formal [2 + 2] CA followed by a retro-electrocyclization to afford sterically congested tetracyanobutadiene (TCBD) conjugates. The substituent (H or Me) on the aromatic ring adjacent to the butadiene moiety thereby determines whether the butadiene adopts an s-cis or s-trans conformation, and thus controls the physicochemical properties of the resulting TCBDs. The TCBD conjugates exhibit ICT absorptions (≤800 nm) together with up to four reversible reduction steps.
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Affiliation(s)
- Shin-Ichiro Kato
- Department of Materials Science, School of Engineering, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan.
| | - Tomokazu Kijima
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tsukasa Abe
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Satoshi Kuwako
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
| | - Hidenori Miyauchi
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
| | - Naoki Yoshikawa
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
| | - Koji Yamamoto
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Toshitada Yoshihara
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
| | - Seiji Tobita
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
| | - Yosuke Nakamura
- Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
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4
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Singh A, Pati AK, Mishra AK. Photophysical Impact of Diacetylenic Conjugation on Classical Donor–Acceptor Electronic Energy Pair. J Phys Chem A 2019; 123:443-453. [DOI: 10.1021/acs.jpca.8b09689] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Anuja Singh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, Tamil Nadu, India
| | - Avik Kumar Pati
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, Tamil Nadu, India
| | - Ashok Kumar Mishra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, Tamil Nadu, India
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5
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Sun X, James TD, Anslyn EV. Arresting “Loose Bolt” Internal Conversion from −B(OH)2 Groups is the Mechanism for Emission Turn-On in ortho-Aminomethylphenylboronic Acid-Based Saccharide Sensors. J Am Chem Soc 2018; 140:2348-2354. [DOI: 10.1021/jacs.7b12877] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Xiaolong Sun
- Department
of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Tony D. James
- Department
of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Eric V. Anslyn
- Department
of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
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6
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Alty IG, Abelt CJ. Stereoelectronics of the Hydrogen-Bond-Induced Fluorescence Quenching of 3-Aminofluorenones with Alcohols. J Phys Chem A 2017. [PMID: 28644628 DOI: 10.1021/acs.jpca.7b02142] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two derivatives of 3-amino-9-fluorenone (1) bearing one (2) and two methyl (3) groups flanking the carbonyl group are prepared. Comparison of their photophysical properties show that all suffer efficient radiationless deactivation in the presence of alcohols. Preferential solvation studies with mono alcohols reveal that a single H-bonding interaction quenches the excited states of 1 and 2, but not that of 3. In contrast, a single molecule of ethylene glycol quenches all three. These results are interpreted in a quenching mechanism similar to one proposed by Inoue and co-workers, but where an out-of-plane H-bond with the carbonyl group gives rise to an emissive species, while an in-plane H-bond results in quenching.
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Affiliation(s)
- Isaac G Alty
- Department of Chemistry, College of William and Mary , Williamsburg, Virginia 23185, United States
| | - Christopher J Abelt
- Department of Chemistry, College of William and Mary , Williamsburg, Virginia 23185, United States
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7
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Siva S, Kothai Nayaki S, Rajendiran N. Spectral and molecular modeling investigations of supramolecular complexes of mefenamic acid and aceclofenac with α- and β-cyclodextrin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 174:349-362. [PMID: 29941144 DOI: 10.1016/j.saa.2014.12.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 11/28/2014] [Accepted: 12/01/2014] [Indexed: 06/08/2023]
Abstract
Inclusion complexes of mefenamic acid (MFA) and aceclofenac (ALF) with α- and β-cyclodextrins (CDs) in aqueous medium were investigated by absorption, fluorescence, time-resolved fluorescence methods. The solid inclusion complexes between drugs and CDs were characterized by SEM, TEM, FT-IR, 1H NMR, DSC and powder XRD techniques. Spectral studies indicated that both CDs form 1:1 inclusion complex with MFA and ALF. The experimental results revealed that the inclusion process is a spontaneous process. Time-resolved fluorescence studies suggested that ALF exhibited biexponential decay in aqueous and triexponential decay in CD whereas significant enhancement of lifetime of decay components of MFA was observed. Morphologies of drug-CD complexes observed by TEM demonstrate that self-aggregates of MFA/α-CD, ALF/α-CD and ALF/β-CD were nano-sized particles while vesicles were observed for MFA/β-CD. A spatial arrangement of inclusion complex is proposed based on 1H NMR and PM3 results. Investigations of thermodynamic and electronic properties confirmed the stability of the inclusion complex.
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Affiliation(s)
- S Siva
- Department of Chemistry, Annamalai University, Annamalainagar, Tamil Nadu 608 002, India.
| | - S Kothai Nayaki
- Chemistry Section, FEAT, Annamalai University, Annamalainagar, Tamil Nadu 608 002, India
| | - N Rajendiran
- Department of Chemistry, Annamalai University, Annamalainagar, Tamil Nadu 608 002, India
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8
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Ghosh R, Mora AK, Nath S, Palit DK. Ultrafast Dynamics of Hydrogen Bond Breaking and Making in the Excited State of Fluoren-9-one: Time-Resolved Visible Pump–IR Probe Spectroscopic Study. J Phys Chem B 2017; 121:1068-1080. [DOI: 10.1021/acs.jpcb.6b11293] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rajib Ghosh
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Mumbai-400094, India
| | - Aruna K. Mora
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Mumbai-400094, India
| | - Sukhendu Nath
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Mumbai-400094, India
| | - Dipak K. Palit
- Radiation and Photochemistry
Division, Bhabha Atomic Research Centre, Mumbai-400094, India
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9
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Sandoval-Torrientes R, Calbo J, García-Fresnadillo D, Santos J, Ortí E, Martín N. Rhodanine-based dyes absorbing in the entire visible spectrum. Org Chem Front 2017. [DOI: 10.1039/c6qo00760k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of new broad-absorbing rhodanine-fluorene dyes conjugated with triarylamines are presented. Spectroscopic and electrochemical characterizations, along with theoretical DFT calculations, unveil the electronic and optical properties of the dyes.
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Affiliation(s)
| | - Joaquín Calbo
- Instituto de Ciencia Molecular
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - David García-Fresnadillo
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - José Santos
- IMDEA-Nanociencia
- Ciudad Universitaria de Cantoblanco
- 28049 Madrid
- Spain
| | - Enrique Ortí
- Instituto de Ciencia Molecular
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - Nazario Martín
- IMDEA-Nanociencia
- Ciudad Universitaria de Cantoblanco
- 28049 Madrid
- Spain
- Departamento de Química Orgánica
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10
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Push–pull fluorenones and benzazulenequinones: regioselective [4+2] and [2+2] cycloadditions of benzopentalenequinone derivative and alkynes bearing an aniline moiety. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.09.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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Gerbich T, Herterich J, Köhler J, Fischer I. Time-Domain Study of the S3 State of 9-Fluorenone. J Phys Chem A 2014; 118:1397-402. [DOI: 10.1021/jp412031f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thiemo Gerbich
- Institute
of Physical and
Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Jörg Herterich
- Institute
of Physical and
Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Juliane Köhler
- Institute
of Physical and
Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Ingo Fischer
- Institute
of Physical and
Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
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12
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Ghosh I, Mukhopadhyay A, Koner AL, Samanta S, Nau WM, Moorthy JN. Excited-state properties of fluorenones: influence of substituents, solvent and macrocyclic encapsulation. Phys Chem Chem Phys 2014; 16:16436-45. [DOI: 10.1039/c4cp01724b] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescence and radiationless deactivation of methoxy-substituted fluorenones are strongly guided by location(s) of the substituent(s) in the fluorenone core.
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Affiliation(s)
| | - Arindam Mukhopadhyay
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016, India
| | | | - Subhas Samanta
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016, India
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13
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Homnick PJ, Tinkham JS, Devaughn R, Lahti PM. Engineering Frontier Energy Levels in Donor–Acceptor Fluoren-9-ylidene Malononitriles versus Fluorenones. J Phys Chem A 2013; 118:475-86. [DOI: 10.1021/jp407854r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Paul J. Homnick
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003 United States
| | - Jonathan S. Tinkham
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003 United States
| | - Raymond Devaughn
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003 United States
| | - Paul M. Lahti
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003 United States
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14
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WITHDRAWN: Investigation of α- and β-cyclodextrin inclusion complexes with mefenamic acid and aceclofenac drugs: Spectral and theoretical study. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2013.11.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Bergen A, Bohne C, Fuentealba D, Ihmels H, Bats JW, Deiseroth HJ, Neumann E. Studies of the solvatochromic emission properties of N-aroylurea derivatives II: influence of hydrogen-bonding interactions. Photochem Photobiol Sci 2012; 11:1914-28. [PMID: 22945663 DOI: 10.1039/c2pp25167a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solvatochromic emission properties of five naphthoylurea derivatives with different substitution patterns at the naphthoylurea functionality were investigated, with a particular focus on the influence of inter- and intramolecular H-bonding interactions. The bathochromic shifts of the emission maxima correlate well with the acceptor number or Catalán's acidity of the solvent (Δλ = 47-86 nm), indicating an excited species with a pronounced negative charge that is stabilized by H-bond donating (HBD) solvents. In media with restricted free volume the formation of the charged species is not favored, because the required conformational change to establish an intramolecular charge transfer (ICT) between the fluorophore and the acylurea substituent is hindered, and the emission mainly originates from the locally excited state. This relationship between the alignment of the naphthoyl carbonyl functionality relative to the naphthyl ring and the spectroscopic shift was confirmed by the comparison of the ground state conformation and the emission spectra of the naphthoylurea derivatives in the solid state. Time-resolved experiments revealed different excited entities, whose lifetimes are significantly influenced by the HBD properties and the temperature of the environment. With few exceptions the naphthoylurea derivatives exhibit only two emissive species in the nanosecond range. All experimental data point to conformational relaxation and solvent reorganization leading to the cis and trans isomers of one preferential conformer with respect to the acylurea unit. The structure of the preferred conformation is mainly determined by the possible inter- or intramolecular H-bonds and is therefore also strongly influenced by the HBD and H-bond accepting (HBA) properties of the polar solvents. As the NH groups of the acylurea functionality contribute mainly to the entire inter- and intramolecular H-bond arrangement the variation of the substitution pattern of the urea unit, specifically the presence and position of the NH groups, leads to derivatives with significantly different steady-state and time-resolved emission properties.
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Affiliation(s)
- Anna Bergen
- Department of Chemistry and Biology, University of Siegen, Siegen, Germany
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16
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Shigeta M, Morita M, Konishi GI. Selective formation of twisted intramolecular charge transfer and excimer emissions on 2,7-bis(4-diethylaminophenyl)-fluorenone by choice of solvent. Molecules 2012; 17:4452-9. [PMID: 22504830 PMCID: PMC6268939 DOI: 10.3390/molecules17044452] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 03/30/2012] [Accepted: 04/06/2012] [Indexed: 11/16/2022] Open
Abstract
We designed and synthesized a donor-acceptor-donor dye consisting of a 2,7-disubstituted fluorenone with diethylaminophenyl moieties present as strong electron donating groups. Switching between twisted intramolecular charge transfer (TICT) emission and excimer emission was achieved, with no ground state changes, by simply changing the solvent used. In a nonpolar solvent, excimer emission was observed; with increasing polarity, the emission gradually disappeared, and the TICT emission appeared.
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Affiliation(s)
- Masayuki Shigeta
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
| | - Mifumi Morita
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
| | - Gen-ichi Konishi
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
- PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan
- Author to whom correspondence should be addressed; ; Tel.: +81-3-5734-2321; Fax: +81-3-5734-2888
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17
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Homnick PJ, Lahti PM. Modular electron donor group tuning of frontier energy levels in diarylaminofluorenone push–pull molecules. Phys Chem Chem Phys 2012; 14:11961-8. [DOI: 10.1039/c2cp41813d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Estrada LA, Yarnell JE, Neckers DC. Revisiting Fluorenone Photophysics via Dipolar Fluorenone Derivatives. J Phys Chem A 2011; 115:6366-75. [DOI: 10.1021/jp200507j] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Leandro A. Estrada
- Center for Photochemical Sciences at Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - James E. Yarnell
- Center for Photochemical Sciences at Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Douglas C. Neckers
- Center for Photochemical Sciences at Bowling Green State University, Bowling Green, Ohio 43403, United States
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19
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Schneck CM, Poncheri AJ, Jennings JT, Snyder DL, Worlinsky JL, Basu S. Competition between solvent quenching and indole quenching of 9-fluorenone: a spectroscopic and computational study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 75:624-628. [PMID: 20007022 DOI: 10.1016/j.saa.2009.11.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2009] [Revised: 11/04/2009] [Accepted: 11/10/2009] [Indexed: 05/28/2023]
Abstract
The interaction between 9-fluorenone, various indoles and solvents has been studied using steady-state fluorescence spectroscopy and quantum chemical calculations. It was determined that polar protic solvents such as methanol and ethanol significantly quenched the fluorescence of 9-fluorenone but various indoles reversed the solvent quenching. The effect of various solvents on the 9-fluorenone carbonyl vibration was investigated using infrared spectroscopy. Ab initio calculations using Gaussian03 were also carried out in order to determine the minimum energy conformations of these systems along with binding energies.
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Affiliation(s)
- Crystal M Schneck
- Department of Chemistry, Susquehanna University, 514 University Avenue, Selinsgrove, PA 17870, United States
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20
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Caselli M, Ferrari E, Imbriano C, Pignedoli F, Saladini M, Ponterini G. Probing solute–solvent hydrogen bonding with fluorescent water-soluble curcuminoids. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.01.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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21
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Varne M, Samant V, Mondal JA, Nayak SK, Ghosh HN, Palit DK. Ultrafast Relaxation Dynamics of the Excited States of 1-Amino- and 1-(N,N-Dimethylamino)-fluoren-9-ones. Chemphyschem 2009; 10:2979-94. [DOI: 10.1002/cphc.200900309] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Mondal JA, Samant V, Varne M, Singh AK, Ghanty TK, Ghosh HN, Palit DK. The Role of Hydrogen-Bonding Interactions in the Ultrafast Relaxation Dynamics of the Excited States of 3- and 4-Aminofluoren-9-ones. Chemphyschem 2009; 10:2995-3012. [DOI: 10.1002/cphc.200900325] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Sherin PS, Grilj J, Tsentalovich YP, Vauthey E. Ultrafast Excited-State Dynamics of Kynurenine, a UV Filter of the Human Eye. J Phys Chem B 2009; 113:4953-62. [DOI: 10.1021/jp900541b] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peter S. Sherin
- International Tomography Center SB RAS, Institutskaya 3a, 630090 Novosibirsk, Russia, and Department of Physical Chemistry, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Jakob Grilj
- International Tomography Center SB RAS, Institutskaya 3a, 630090 Novosibirsk, Russia, and Department of Physical Chemistry, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Yuri P. Tsentalovich
- International Tomography Center SB RAS, Institutskaya 3a, 630090 Novosibirsk, Russia, and Department of Physical Chemistry, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Eric Vauthey
- International Tomography Center SB RAS, Institutskaya 3a, 630090 Novosibirsk, Russia, and Department of Physical Chemistry, University of Geneva, 30 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
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Józefowicz M. Spectroscopic determination of solvation shell composition of fluorenone and 4-hydroxyfluorenone in binary solvent mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:537-542. [PMID: 18282737 DOI: 10.1016/j.saa.2008.01.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2007] [Accepted: 01/03/2008] [Indexed: 05/25/2023]
Abstract
Preferential solvation of fluorenone (9Fl) and 4-hydroxyfluorenone (4HOFl) in binary solvent mixtures (cyclohexane-tetrahydrofuran (CH-THF) and cyclohexane-ethanol (CH-EtOH)) has been studied using steady-state spectroscopic measurements. The solvation of the fluorenones, both in the ground and in the excited states, exhibits a non-linear solvatochromic shifts as a function of polar component in the binary solvent mixtures. The results of spectroscopic measurements were used to calculate, according to Bakhshiev's and Kiselev's theory, the fluorescence spectra of solvates having different number of polar component in the first solvation shell. The different features of fluorescence spectra of molecule under study in CH-THF and CH-EtOH are explained by the absence and presence of specific solute-solvent interactions (hydrogen bond).
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Affiliation(s)
- Marek Józefowicz
- Institute of Experimental Physics, University of Gdańsk, ul. Wita Stwosza 57, 80-952 Gdańsk, Poland.
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25
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Jose DA, Kumar DK, Kar P, Verma S, Ghosh A, Ganguly B, Ghosh HN, Das A. Role of positional isomers on receptor–anion binding and evidence for resonance energy transfer. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.09.008] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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26
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Ghosh A, Ganguly B, Das A. Urea-Based Ruthenium(II)−Polypyridyl Complex as an Optical Sensor for Anions: Synthesis, Characterization, and Binding Studies. Inorg Chem 2007; 46:9912-8. [PMID: 17949084 DOI: 10.1021/ic701447g] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Amrita Ghosh
- Central Salt and Marine Chemicals Research Institute (CSIR), Bhavnagar 364002, Gujarat, India
| | - Bishwajit Ganguly
- Central Salt and Marine Chemicals Research Institute (CSIR), Bhavnagar 364002, Gujarat, India
| | - Amitava Das
- Central Salt and Marine Chemicals Research Institute (CSIR), Bhavnagar 364002, Gujarat, India
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27
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Petkova I, Mudadu MS, Singh A, Thummel RP, van Stokkum IHM, Buma WJ, Waluk J. Structure and Photophysics of 2-(2‘-Pyridyl)benzindoles: The Role of Intermolecular Hydrogen Bonds. J Phys Chem A 2007; 111:11400-9. [DOI: 10.1021/jp0735841] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Irina Petkova
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G. Bontchev bl. IX, Sofia 1113, Bulgaria, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, Department of Chemistry, University of Houston, Houston, Texas, 77204-5003, and Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The
| | - Maria S. Mudadu
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G. Bontchev bl. IX, Sofia 1113, Bulgaria, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, Department of Chemistry, University of Houston, Houston, Texas, 77204-5003, and Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The
| | - Ajay Singh
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G. Bontchev bl. IX, Sofia 1113, Bulgaria, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, Department of Chemistry, University of Houston, Houston, Texas, 77204-5003, and Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The
| | - Randolph P. Thummel
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G. Bontchev bl. IX, Sofia 1113, Bulgaria, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, Department of Chemistry, University of Houston, Houston, Texas, 77204-5003, and Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The
| | - Ivo H. M. van Stokkum
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G. Bontchev bl. IX, Sofia 1113, Bulgaria, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, Department of Chemistry, University of Houston, Houston, Texas, 77204-5003, and Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The
| | - Wybren Jan Buma
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G. Bontchev bl. IX, Sofia 1113, Bulgaria, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, Department of Chemistry, University of Houston, Houston, Texas, 77204-5003, and Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The
| | - Jacek Waluk
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Akad. G. Bontchev bl. IX, Sofia 1113, Bulgaria, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, Department of Chemistry, University of Houston, Houston, Texas, 77204-5003, and Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The
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28
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Józefowicz M. Determination of reorganization energy of fluorenone and 4-hydroxyfluorenone in neat and binary solvent mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 67:444-9. [PMID: 16965931 DOI: 10.1016/j.saa.2006.07.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2006] [Revised: 07/18/2006] [Accepted: 07/28/2006] [Indexed: 05/11/2023]
Abstract
Steady-state absorption and fluorescence measurements of fluorenone and 4-hydroxyfluorenone in neat and binary solvent mixtures were used to explore the reorganization energy in liquid system. The results of spectroscopic measurements were used to calculate, according to Marcus theory, the outer-sphere solvent reorganization energy, lambda(0), and the internal molecular reorganization energy, lambda(in). Preferential solvation of fluorenone and 4-hydroxyfluorenone in binary solvent mixtures has been studied by monitoring the outer-sphere solvent reorganization energy. In cyclohexane-tetrahydrofuran mixtures, the deviation from linearity in the lambda(0) versus the solution polarity is due to non-specific dipolar solvent-solute interactions. For cyclohexane-ethanol binary mixtures, both non-specific and specific (hydrogen bond) interactions contribute to the observed changes.
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Affiliation(s)
- Marek Józefowicz
- Institute of Experimental Physics, University of Gdańsk, ul. Wita Stwosza 57, 80-952 Gdańsk, Poland.
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29
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Sebök-Nagy K, Biczók L, Morimoto A, Shimada T, Inoue H. Energy Dissipation Processes of singlet-excited 1-Hydroxyfluorenone and its Hydrogen-bonded Complex with N-methylimidazole¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2004.tb00059.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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30
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Gautrot JE, Hodge P, Cupertino D, Helliwell M. 2,6-Diaryl-9,10-anthraquinones as models for electron-accepting polymers. NEW J CHEM 2007. [DOI: 10.1039/b701257h] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Wenska G, Koput J, Pedzinski T, Marciniak B, Karolczak J, Golankiewicz B. Effect of Hydroxylic Solvent on the Fluorescence Behavior of Some Bioactive 9-Oxo-imidazo[1,2-a]purine Derivatives. J Phys Chem A 2006; 110:11025-33. [PMID: 16986835 DOI: 10.1021/jp062680j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The spectral and photophysical behavior of four fluorescent 9-oxo-imidazo[1,2-a]purine derivatives containing pyridyl, pyridylphenyl, phenyl, and biphenylyl substituents at the C(6) position of the tricyclic skeleton is described. The studies were performed in several aprotic and protic organic solvents using absorption spectroscopy as well as steady-state and time-resolved fluorescence spectroscopy. The results are also presented of TDDFT calculations on singlet-singlet excitation energies and oscillator strengths for two models of 9-oxo-imidazo[1,2-a]purine, with phenyl or pyridyl substituents, both in the gas phase and in methanol solution. While the derivatives with aryl substituents did not show any significant dependence of their static and dynamic fluorescence properties on the nature of the solvent, the compounds containing a pyridine residue exhibited a remarkable reduction of their fluorescence quantum yields and lifetimes in the alcoholic solutions. The solute-solvent hydrogen-bonding interaction in the first excited singlet state is responsible for the fast radiationless decay rates determined for pyridyl- and pyridylphenyl-substituted compounds in protic solvents. The results of experimental and theoretical studies show that the hydrogen of the alcohols' hydroxyl group and the nitrogen atom of the pyridine moiety are involved in the interaction. The fluorescence-quenching experiments performed for the pyridyl-substituted 9-oxo-imidazo[1,2-a]purine derivative using trifluoroethanol, methanol, and butanol as quenchers revealed that the quenching efficiencies, expressed by the Stern-Volmer quenching constants, correlate with the H-bond donating abilities of the alcohols. The quenching is a dynamic process, and the H-bonded complex formed is nonfluorescent. The experimentally determined and the calculated values of the dipole moment change associated with the electronic excitation indicate that the excited S(1) states of all of the molecules studied in this work have an intramolecular charge-transfer character and that electronic charge is transferred to the C(6) substituent upon excitation. Thus, the ability of the pyridyl substituent nitrogen atom to act as an H-bond acceptor in the excited S(1) state is enhanced. The 6-pyridyl-9-oxo-imidazo[1,2-a]purine presents a novel fluorophore, which, besides its medical applications, may be useful as a sensor of hydroxyl groups in microorganized systems.
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Affiliation(s)
- Grazyna Wenska
- Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland.
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Cuquerella MC, Miranda MA, Bosca F. Role of Excited State Intramolecular Charge Transfer in the Photophysical Properties of Norfloxacin and Its Derivatives. J Phys Chem A 2006; 110:2607-12. [PMID: 16494369 DOI: 10.1021/jp0559837] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photophysical properties of 1-ethyl-6-fluoro-7-(1-piperazinyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (norfloxacin, NFX) and some of its derivatives have been studied to evaluate the role of the free carboxylic acid and the nonprotonated piperazinyl group in the behavior of the 1,4-dihydro-4-oxoquinoline ring. Steady state and time-resolved fluorescence measurements at different pHs provide clear evidence in favor of singlet excited-state deactivation of NFX and its N(4')-methyl derivative pefloxacin (PFX) via intramolecular electron transfer from the N(4') atom of the piperazinyl ring to the fluoroquinolone (FQ) main system. This is a very efficient, energy-wasting pathway, which becomes dramatically enhanced in basic media. Acetylation at N(4') (as in ANFX) decreases the availability of the lone pair, making observable its fluorescence and the transient absorption spectrum of its triplet excited state even at high pH. It also reveals that the geometry of FQs changes from an almost sp3 hybridization of the N(1') of the piperazinyl substituent in the ground state to nearly sp2 in the singlet excited state (rehybridization accompanied by intramolecular charge transfer, RICT); accordingly, the singlet energy of ANFX is significantly lower than that of NFX and PFX. The fluorescence measurements using acetonitrile as a polar nonprotic organic solvent further support deactivation of the singlet excited state of nonacetylated NFX derivatives via intramolecular electron transfer from the N(4') atom.
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Affiliation(s)
- M Consuelo Cuquerella
- Instituto de Tecnología Química UPV-CSIC/Departamento de Química, Universidad Politécnica de Valencia, Avenida de los Naranjos s/n, 46022-Valencia, Spain
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Samant V, Singh AK, Ramakrishna G, Ghosh HN, Ghanty TK, Palit DK. Ultrafast Intermolecular Hydrogen Bond Dynamics in the Excited State of Fluorenone. J Phys Chem A 2005; 109:8693-704. [PMID: 16834271 DOI: 10.1021/jp050848f] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Steady-state fluorescence and time-resolved absorption measurements in pico- and femtosecond time domain have been used to investigate the dynamics of hydrogen bond in the excited singlet (S(1)) state of fluorenone in alcoholic solvents. A comparison of the features of the steady-state fluorescence spectra of fluorenone in various kinds of media demonstrates that two spectroscopically distinct forms of fluorenone in the S(1) state, namely the non-hydrogen-bonded (or free) molecule as well as the hydrogen-bonded complex, are responsible for the dual-fluorescence behavior of fluorenone in solutions of normal alcoholic solvents at room temperature (298 K). However, in 2,2,2-trifluoroethanol (TFE), a strong hydrogen bond donating solvent, emission from only the hydrogen-bonded complex is observed. Significant differences have also been observed in the temporal evolution of the absorption spectroscopic properties of the S(1) state of fluorenone in protic and aprotic solvents following photoexcitation using 400 nm laser pulses. An ultrafast component representing the solvent-induced vibrational energy relaxation (VER) process has been associated with the dynamics of the S(1) state of fluorenone in all kinds of solvents. However, in protic solvents, in addition to the VER process, further evolution of the spectroscopic and dynamical properties of the S(1) state have been observed because of repositioning of the hydrogen bonds around the carbonyl group. In normal alcohols, two different kinds of hydrogen-bonded complex of the fluorenone-alcohol system with different orientations of the hydrogen bond with respect to the carbonyl group and the molecular plane of fluorenone have been predicted. On the other hand, in TFE, formation of only one kind of hydrogen-bonded complex has been observed. These observations have been supported by theoretical calculations of the geometries of the hydrogen-bonded complexes in the ground and the excited states of fluorenone. Linear correlation between the lifetimes of the equilibration process occurring because of repositioning of the hydrogen bonds and Debye or longitudinal relaxation times of the normal alcoholic solvents establish the fact that, in weakly hydrogen bond donating solvents, the hydrogen bond dynamics can be described as merely a solvation process. Whereas, in TFE, hydrogen bond dynamics is better described by a process of conversion between two distinct excited states, namely, the non-hydrogen-bonded form and the hydrogen-bonded complex.
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Affiliation(s)
- Vaishali Samant
- Radiation Chemistry & Chemical Dynamics Division, Bhabha Atomic Research Center, Mumbai 400089, India
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Barik A, Kumbhakar M, Nath S, Pal H. Evidence for the TICT mediated nonradiative deexcitation process for the excited coumarin-1 dye in high polarity protic solvents. Chem Phys 2005. [DOI: 10.1016/j.chemphys.2005.04.018] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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35
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Samant V, Singh AK, Mukherjee T, Palit DK. Triplet excited states and radical intermediates formed in electron pulse radiolysis of amino-substituted fluorenones. Radiat Phys Chem Oxf Engl 1993 2005. [DOI: 10.1016/j.radphyschem.2004.04.132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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36
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Shimada H, Nakamura A, Yoshihara T, Tobita S. Intramolecular and intermolecular hydrogen-bonding effects on photophysical properties of 2'-aminoacetophenone and its derivatives in solution. Photochem Photobiol Sci 2005; 4:367-75. [PMID: 15803207 DOI: 10.1039/b416284f] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Effects of intra- and intermolecular hydrogen-bonds on the photophysical properties of 2'-aminoacetophenone derivatives (X-C6H4-COCH3) having a substituted amino group (X) with different hydrogen-bonding ability to the carbonyl oxygen (X: NH2(AAP), NHCH3(MAAP), N(CH3)2(DMAAP), NHCOCH3(AAAP), NHCOCF3(TFAAP)) are investigated by means of steady-state and time-resolved fluorescence spectroscopy and time-resolved thermal lensing. Based on the photophysical parameters obtained in aprotic solvents with different polarity and protic solvents with different hydrogen-bonding ability, the characteristic photophysical behavior of the 2'-aminoacetophenone derivatives is discussed in terms of hydrogen-bonding and n,pi*-pi,pi* vibronic coupling. The dominant deactivation process of AAP and MAAP in nonpolar aprotic solvents is the extremely fast internal conversion (k(ic)= 1.0 x 10(11) s(-1) for AAP and 3.9 x 10(10) s(-1) for MAAP in n-hexane). The internal conversion rates of both compounds decrease markedly with increasing solvent polarity, suggesting that vibronic interactions between close-lying S1(pi,pi*) and S2(n,pi*) states lead to the large increase in the non-radiative decay rate of the lowest excited singlet state. It is also suggested that for MAAP, which has a stronger hydrogen-bond as compared to AAP, an intramolecular hydrogen-bonding induced deactivation is involved in the dissipation of the S1 state. For DMAAP, which cannot possess an intramolecular hydrogen-bond, the primary relaxation mechanism of the S1 state in nonpolar aprotic solvents is the intersystem crossing to the triplet state, whereas in protic solvents very efficient internal conversion due to intermolecular hydrogen-bonding is induced. In contrast, the fluorescence spectra of AAAP and TFAAP, which have an amino group with a much stronger hydrogen-bonding ability, give strongly Stokes-shifted fluorescence, indicating that these compounds undergo excited-state intramolecular proton transfer reaction upon electronic excitation.
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Affiliation(s)
- Hirofumi Shimada
- Department of Chemistry, Gunma University, Kiryu, Gunma, 376-8515, Japan
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Kirichenko TI, Meshkova SB, Topilova ZM, Kiriyak AV, Lyapunov AY, Kulygina EY, Luk’yanenko NG. Synthesis and Luminescence Spectral Properties of New 2,7-Dihydroxy-9H-fluoren-9-one Derivatives. RUSS J GEN CHEM+ 2005. [DOI: 10.1007/s11176-005-0212-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sebok-Nagy K, Biczók L, Morimoto A, Shimada T, Inoue H. Energy Dissipation Processes of Singlet-excited 1-Hydroxyfluorenone and its Hydrogen-bonded Complex with N-methylimidazole¶. Photochem Photobiol 2004; 80:119-26. [PMID: 15339210 DOI: 10.1562/2004-01-27ra-067.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Effects of solvent, pH and hydrogen bonding with N-methylimidazole (MIm) on the photophysical properties of 1-hydroxyfluorenone (1HOF) have been studied. Fluorescence lifetime, fluorescence quantum yield and triplet yield measurements demonstrated that intersystem crossing was the dominant process in apolar media and its rate constant significantly diminished with increasing solvent polarity. The acceleration of internal conversion in alcohols paralleled the strength of intermolecular hydrogen bonding. The faster energy dissipation from the singlet-excited state in cyclohexane was attributed to intramolecular hydrogen bonding. The pK(a) of 1HOF decreased from 10.06 to 5.0 on light absorption, and H(3)O(+) quenched the singlet-excited molecules in a practically diffusion-controlled reaction. On addition of MIm in toluene, dual fluorescence was observed, which was attributed to reversible formation of excited hydrogen-bonded ion pair. Rate constants for the various deactivation pathways were derived from the combined analysis of the steady-state and the time-resolved fluorescence results.
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Affiliation(s)
- Krisztina Sebok-Nagy
- Chemical Research Center, Hungarian Academy of Sciences, Pusztaszeri út 59-67, 1025 Budapest, Hungary
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El-Kemary MA. Relaxation pathways of photoexcited non-steroidal anti-inflammatory drugs: flufenamic and mefenamic acids. Chem Phys 2003. [DOI: 10.1016/j.chemphys.2003.07.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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41
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Józefowicz M, Heldt JR. Preferential solvation of fluorenone and 4-hydroxyfluorenone in binary solvent mixtures. Chem Phys 2003. [DOI: 10.1016/s0301-0104(03)00379-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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42
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Ikegami M, Arai T. Photoisomerization and Fluorescence Properties of Hemiindigo Compounds Having Intramolecular Hydrogen Bonding. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2003. [DOI: 10.1246/bcsj.76.1783] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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43
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Nagy K, Biczók L, Demeter A, Kövér P, Riedl Z. Photophysical properties of novel [1,2,3]triazolo[4,5-d] pyridazine derivatives. J Photochem Photobiol A Chem 2002. [DOI: 10.1016/s1010-6030(02)00301-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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44
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Morimoto A, Biczók L, Yatsuhashi T, Shimada T, Baba S, Tachibana H, Tryk DA, Inoue H. Radiationless Deactivation Process of 1-Dimethylamino-9-fluorenone Induced by Conformational Relaxation in the Excited State: A New Model Molecule for the TICT Process. J Phys Chem A 2002. [DOI: 10.1021/jp0203604] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Akimitsu Morimoto
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and CREST (Japan Science and Technology)
| | - László Biczók
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and CREST (Japan Science and Technology)
| | - Tomoyuki Yatsuhashi
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and CREST (Japan Science and Technology)
| | - Tetsuya Shimada
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and CREST (Japan Science and Technology)
| | - Shingo Baba
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and CREST (Japan Science and Technology)
| | - Hiroshi Tachibana
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and CREST (Japan Science and Technology)
| | - Donald A. Tryk
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and CREST (Japan Science and Technology)
| | - Haruo Inoue
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and CREST (Japan Science and Technology)
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Biczók L, Cser A, Nagy K. Substituent and solvent effects on the photophysical properties of 3-azafluorenone derivatives. J Photochem Photobiol A Chem 2001. [DOI: 10.1016/s1010-6030(01)00597-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Morimoito A, Yatsuhashi T, Shimada T, Biczók L, Tryk DA, Inoue H. Radiationless Deactivation of an Intramolecular Charge Transfer Excited State through Hydrogen Bonding: Effect of Molecular Structure and Hard−Soft Anionic Character in the Excited State. J Phys Chem A 2001. [DOI: 10.1021/jp0117213] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Akimitsu Morimoito
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Science, P.O. Box 17, 1525 Budapest, Hungary, and CREST, Japan Science and Technology
| | - Tomoyuki Yatsuhashi
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Science, P.O. Box 17, 1525 Budapest, Hungary, and CREST, Japan Science and Technology
| | - Tetsuya Shimada
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Science, P.O. Box 17, 1525 Budapest, Hungary, and CREST, Japan Science and Technology
| | - László Biczók
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Science, P.O. Box 17, 1525 Budapest, Hungary, and CREST, Japan Science and Technology
| | - Donald A. Tryk
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Science, P.O. Box 17, 1525 Budapest, Hungary, and CREST, Japan Science and Technology
| | - Haruo Inoue
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachiohji, Tokyo 192-0397, Japan, Chemical Research Center, Hungarian Academy of Science, P.O. Box 17, 1525 Budapest, Hungary, and CREST, Japan Science and Technology
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Morimoto A, Yatsuhashi T, Shimada T, Kumazaki S, Yoshihara K, Inoue H. Molecular Mechanism of the Intermolecular Hydrogen Bond between 2-Piperidinoanthraquinone and Alcohol in the Excited State: Direct Observation of the Out-of-Plane Mode Interaction with Alcohol by Transient Absorption Studies. J Phys Chem A 2001. [DOI: 10.1021/jp004560w] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akimitsu Morimoto
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiouji, Tokyo 192-0397, Japan, Japan Advanced Institute of Science and Technology, Tatsunokuchi, Ishikawa 9 23-12, Japan, and CREST, JST (Japan Science and Technology)
| | - Tomoyuki Yatsuhashi
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiouji, Tokyo 192-0397, Japan, Japan Advanced Institute of Science and Technology, Tatsunokuchi, Ishikawa 9 23-12, Japan, and CREST, JST (Japan Science and Technology)
| | - Tetsuya Shimada
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiouji, Tokyo 192-0397, Japan, Japan Advanced Institute of Science and Technology, Tatsunokuchi, Ishikawa 9 23-12, Japan, and CREST, JST (Japan Science and Technology)
| | - Shigeichi Kumazaki
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiouji, Tokyo 192-0397, Japan, Japan Advanced Institute of Science and Technology, Tatsunokuchi, Ishikawa 9 23-12, Japan, and CREST, JST (Japan Science and Technology)
| | - Keitarou Yoshihara
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiouji, Tokyo 192-0397, Japan, Japan Advanced Institute of Science and Technology, Tatsunokuchi, Ishikawa 9 23-12, Japan, and CREST, JST (Japan Science and Technology)
| | - Haruo Inoue
- Department of Applied Chemistry, Graduate Course of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiouji, Tokyo 192-0397, Japan, Japan Advanced Institute of Science and Technology, Tatsunokuchi, Ishikawa 9 23-12, Japan, and CREST, JST (Japan Science and Technology)
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Yatsuhashi T, Nakashima N. VUV Laser Chemistry—Formation of Hot Molecules and Their Reactions in the Gas Phase—. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2001. [DOI: 10.1246/bcsj.74.579] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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