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Pal D, Chakraborty S. An Exploration of the Hydrogen Bond Donor Ability of Ammonia. Chemphyschem 2023; 24:e202300382. [PMID: 37523179 DOI: 10.1002/cphc.202300382] [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: 06/01/2023] [Revised: 07/31/2023] [Accepted: 07/31/2023] [Indexed: 08/01/2023]
Abstract
Ammonia is an important molecule due to its wide use in the fertiliser industry. It is also used in aminolysis reactions. Theoretical studies of the reaction mechanism predict that in reactive complexes and transition states, ammonia acts as a hydrogen bond donor forming N-H⋅⋅⋅O hydrogen bond. Experimental reports of N-H⋅⋅⋅O hydrogen bond, where ammonia acts as a hydrogen bond donor are scarce. Herein, the hydrogen bond donor ability of ammonia is investigated with three chalcogen atoms i. e. O, S, and Se using matrix isolation infrared spectroscopy and electronic structure calculations. In addition, the chalcogen bond acceptor ability of ammonia has also been investigated. The hydrogen bond acceptor molecules used here are O(CH3 )2 , S(CH3 )2 , and Se(CH3 )2 . The formation of the 1 : 1 complex has been monitored in the N-H symmetric and anti-symmetric stretching modes of ammonia. The nature of the complex has been delineated using Atoms in Molecules analysis, Natural Bond Orbital analysis, and Energy Decomposition Analysis. This work presents the first comparison of the hydrogen bond donor ability of ammonia with O, S, and Se.
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Affiliation(s)
- Dhritabrata Pal
- Department of Chemistry, Birla Institute of Technology and Science, Pilani, Pilani campus, Vidya Vihar, Rajasthan, 333-031, India
| | - Shamik Chakraborty
- Department of Chemistry, Birla Institute of Technology and Science, Pilani, Pilani campus, Vidya Vihar, Rajasthan, 333-031, India
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2
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Min A, Kim J, Moon CJ, Ahn A, Park J, Choi MY. Spectroscopic and theoretical studies of jet‐cooled 3‐cyanoindole ammonia clusters in the gas phase. B KOREAN CHEM SOC 2022. [DOI: 10.1002/bkcs.12502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ahreum Min
- Core‐Facility Center for Photochemistry & Nanomaterials Gyeongsang National University Jinju Republic of Korea
| | - Jiwon Kim
- Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences Gyeongsang National University Jinju Republic of Korea
| | - Cheol Joo Moon
- Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences Gyeongsang National University Jinju Republic of Korea
| | - Ahreum Ahn
- Center for Supercomputing Applications Korea Institute of Science and Technology Information Daejeon Republic of Korea
| | - Juhyeon Park
- Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences Gyeongsang National University Jinju Republic of Korea
| | - Myong Yong Choi
- Core‐Facility Center for Photochemistry & Nanomaterials Gyeongsang National University Jinju Republic of Korea
- Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences Gyeongsang National University Jinju Republic of Korea
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3
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Qian Y, Gong F, Li J, Ma P, Zhu H, He L, Xia J. A Solvent-Mediated Excited-State Intermolecular Proton Transfer Fluorescent Probe for Fe 3+ Sensing and Cell Imaging. Molecules 2022; 27:516. [PMID: 35056841 PMCID: PMC8778147 DOI: 10.3390/molecules27020516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/02/2022] [Accepted: 01/06/2022] [Indexed: 12/05/2022] Open
Abstract
Constructing excited-state intermolecular proton transfer (ESIPT-e) fluorophores represents significant challenges due to the harsh requirement of bearing a proton donor-acceptor (D-A) system and their matching proton donating-accepting ability in the same molecule. Herein, we synthesized a new-type ESIPT-e fluorophor (2-APC) using the "four-component one-pot" reaction. By the installing of a cyano-group on pyridine scaffold, the proton donating ability of -NH2 was greatly enhanced, enabling 2-APC to undergo ESIPT-e process. Surprisingly, 2-APC exhibited dual-emissions in protic solvents ethanol and normal fluorescence in aprotic solvents, which is vastly different from that of conventional ESIPT-a dyes. The ESIPT emission can be obviously suppressed by Fe3+ due to the coordination reaction of Fe3+ with the A-D system in 2-APC. From this basis, a highly sensitive and selective method was established using 2-APC as a fluorescent probe, which offers the sensitive detection of Fe3+ ranging from 0 to 13 μM with the detection limit of 7.5 nM. The recovery study of spiked Fe3+ measured by the probe showed satisfactory results (97.2103.4%) with the reasonable RSD ranging from 3.1 to 3.8%. Moreover, 2-APC can also exhibit aggregation-induced effect in poor solvent or solid-state, eliciting strong red fluorescence. 2-APC was also applied to cell-imaging, exhibiting good cell-permeability, biocompatibility and color rendering. This multi-mode emission of 2-APC is significant departure from that of conventional extended p-conjugated systems and ESIPT dyes based on a flat and rigid molecular design. The "one-pot synthesis" strategy for the construction of ESIPT molecules pioneered a new route to achieve tricolor-emissive fluorophores.
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Affiliation(s)
- You Qian
- College of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China; (Y.Q.); (P.M.); (H.Z.); (L.H.); (J.X.)
| | - Fuchun Gong
- College of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China; (Y.Q.); (P.M.); (H.Z.); (L.H.); (J.X.)
| | - Jiguang Li
- Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China;
| | - Pan Ma
- College of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China; (Y.Q.); (P.M.); (H.Z.); (L.H.); (J.X.)
| | - Hanming Zhu
- College of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China; (Y.Q.); (P.M.); (H.Z.); (L.H.); (J.X.)
| | - Lingzhi He
- College of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China; (Y.Q.); (P.M.); (H.Z.); (L.H.); (J.X.)
| | - Jiaoyun Xia
- College of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China; (Y.Q.); (P.M.); (H.Z.); (L.H.); (J.X.)
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4
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Miyazaki M, Ohara R, Dedonder C, Jouvet C, Fujii M. Electron-Proton Transfer Mechanism of Excited-State Hydrogen Transfer in Phenol-(NH 3 ) n (n=3 and 5). Chemistry 2017; 24:881-890. [PMID: 29032637 DOI: 10.1002/chem.201704129] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2017] [Indexed: 11/11/2022]
Abstract
Excited-state hydrogen transfer (ESHT) is responsible for various photochemical processes of aromatics, including photoprotection of nuclear basis. Its mechanism is explained by internal conversion from the aromatic ππ* to πσ* states via conical intersection. This means that the electron is transferred to a diffuse Rydberg-like σ* orbital apart from proton migration. This picture means the electron and the proton do not move together and the dynamics are different in principle. Here, we have applied picosecond time-resolved near-infrared (NIR) and infrared (IR) spectroscopy to the phenol-(NH3 )5 cluster, the benchmark system of ESHT, and monitored the electron transfer and proton motion independently. The electron transfer monitored by the NIR transition rises within 3 ps, while the overall H transfer detected by the IR absorption of NH vibration appears with a lifetime of about 20 ps. This clearly proves that the electron motion and proton migration are decoupled. Such a difference of the time-evolutions between the NIR absorption and the IR transition has not been detected in a cluster with three ammonia molecules. We will report our full observation together with theoretical calculations of the potential energy surfaces of the ππ* and πσ* states, and will discuss the ESHT mechanism and its cluster size-dependence between n=3 and 5. It is suggested that the presence and absence of a barrier in the proton transfer coordinate cause the different dynamics.
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Affiliation(s)
- Mitsuhiko Miyazaki
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, R1-15, 4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Ryuhei Ohara
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, R1-15, 4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Claude Dedonder
- CNRS, Physique des Interactions Ioniques et Moleculaires, Aix Marseille Université, (PIIM) UMR 7345, 13397, Marseille cedex, France
| | - Christophe Jouvet
- CNRS, Physique des Interactions Ioniques et Moleculaires, Aix Marseille Université, (PIIM) UMR 7345, 13397, Marseille cedex, France
| | - Masaaki Fujii
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, R1-15, 4259, Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
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5
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Esboui M. Stepwise vs concerted excited state tautomerization of 2-hydroxypyridine: Ammonia dimer wire mediated hydrogen/proton transfer. J Chem Phys 2015. [PMID: 26203026 DOI: 10.1063/1.4926812] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The stepwise and concerted excited state intermolecular proton transfer (PT) and hydrogen transfer (HT) reactions in 2-hydroxypyridine-(NH3)2 complex in the gas phase under Cs symmetry constraint and without any symmetry constraints were performed using quantum chemical calculations. It shows that upon excitation, the hydrogen bonded in 2HP-(NH3)2 cluster facilitates the releasing of both hydrogen and proton transfer reactions along ammonia wire leading to the formation of the 2-pyridone tautomer. For the stepwise mechanism, it has been found that the proton and the hydrogen may transfer consecutively. These processes are distinguished from each other through charge translocation analysis and the coupling between the motion of the proton and the electron density distribution along ammonia wire. For the complex under Cs symmetry, the excited state HT occurs on the A″((1)πσ*) and A'((1)nσ*) states over two accessible energy barriers along reaction coordinates, and excited state PT proceeds mainly through the A'((1)ππ*) and A″((1)nπ*) potential energy surfaces. For the unconstrained complex, potential energy profiles show two (1)ππ*-(1)πσ* conical intersections along enol → keto reaction path indicating that proton and H atom are localized, respectively, on the first and second ammonia of the wire. Moreover, the concerted excited state PT is competitive to take place with the stepwise process, because it proceeds over low barriers of 0.14 eV and 0.11 eV with respect to the Franck-Condon excitation of enol tautomer, respectively, under Cs symmetry and without any symmetry constraints. These barriers can be probably overcome through tunneling effect.
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Affiliation(s)
- Mounir Esboui
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 2092 Tunis, Tunisia
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6
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Bekçioğlu G, Allolio C, Sebastiani D. Water Wires in Aqueous Solutions from First-Principles Calculations. J Phys Chem B 2015; 119:4053-60. [DOI: 10.1021/jp5121417] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Gül Bekçioğlu
- Physics Department, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| | - Christoph Allolio
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám 2, CZ-16610 Prague 6, Czech Republic
| | - Daniel Sebastiani
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
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7
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Homayoon Z, Bowman JM, Evangelista FA. Calculations of Mode-Specific Tunneling of Double-Hydrogen Transfer in Porphycene Agree with and Illuminate Experiment. J Phys Chem Lett 2014; 5:2723-2727. [PMID: 26277970 DOI: 10.1021/jz501482v] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report a theoretical study of mode-specific tunneling splittings in double-hydrogen transfer in trans-porphycene. We use a novel, mode-specific "Qim path method", in which the reaction coordinate is the imaginary-frequency normal mode of the saddle point separating the equivalent minima. The model considers all 108 normal modes and uses no adjustable parameters. The method gives the ground vibrational-state tunneling splitting, as well the increase in the splitting upon excitation of certain modes, in good agreement with experiment. Interpretation of these results is also transparent with this method. In addition, predictions are made for mode excitations not investigated experimentally. Results for d1 and d2 isotopolgues are also in agreement with experiment.
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Affiliation(s)
- Zahra Homayoon
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Joel M Bowman
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Francesco A Evangelista
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
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8
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Bekçioğlu G, Allolio C, Ekimova M, Nibbering ETJ, Sebastiani D. Competition between excited state proton and OH− transport via a short water wire: solvent effects open the gate. Phys Chem Chem Phys 2014; 16:13047-51. [DOI: 10.1039/c4cp00970c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate the acid–base proton exchange reaction in a microsolvated bifunctional chromophore by means of quantum chemical calculations.
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Affiliation(s)
- Gül Bekçioğlu
- Physics Department
- Freie Universität Berlin
- 14195 Berlin, Germany
- Institut für Chemie
- Martin-Luther-Universität Halle-Wittenberg
| | - Christoph Allolio
- Institut für Chemie
- Martin-Luther-Universität Halle-Wittenberg
- 06120 Halle (Saale), Germany
| | - Maria Ekimova
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie
- D-12489 Berlin, Germany
| | - Erik T. J. Nibbering
- Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie
- D-12489 Berlin, Germany
| | - Daniel Sebastiani
- Institut für Chemie
- Martin-Luther-Universität Halle-Wittenberg
- 06120 Halle (Saale), Germany
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9
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Miyazaki M, Kawanishi A, Nielsen I, Alata I, Ishiuchi SI, Dedonder C, Jouvet C, Fujii M. Ground State Proton Transfer in Phenol–(NH3)n (n ≤ 11) Clusters Studied by Mid-IR Spectroscopy in 3–10 μm Range. J Phys Chem A 2013; 117:1522-30. [DOI: 10.1021/jp312074m] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Mitsuhiko Miyazaki
- Chemical Spectroscopy Division,
Chemical Resources Laboratory, Tokyo Institute of Technology, 4259-R1-15, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Ayako Kawanishi
- Chemical Spectroscopy Division,
Chemical Resources Laboratory, Tokyo Institute of Technology, 4259-R1-15, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Iben Nielsen
- Institut des Sciences Moléculaires
d’Orsay and Centre Laser de l’Université Paris
Sud, Université Paris-Sud 11, 91405
Orsay Cedex, France
| | - Ivan Alata
- Institut des Sciences Moléculaires
d’Orsay and Centre Laser de l’Université Paris
Sud, Université Paris-Sud 11, 91405
Orsay Cedex, France
| | - Shun-ichi Ishiuchi
- Chemical Spectroscopy Division,
Chemical Resources Laboratory, Tokyo Institute of Technology, 4259-R1-15, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Claude Dedonder
- Institut des Sciences Moléculaires
d’Orsay and Centre Laser de l’Université Paris
Sud, Université Paris-Sud 11, 91405
Orsay Cedex, France
- PIIM−UMR
CNRS 7345, Aix Marseille Université, Avenue Escadrille
Normandie-Niémen, 13397 Marseille Cedex 20, France
| | - Christophe Jouvet
- Institut des Sciences Moléculaires
d’Orsay and Centre Laser de l’Université Paris
Sud, Université Paris-Sud 11, 91405
Orsay Cedex, France
- PIIM−UMR
CNRS 7345, Aix Marseille Université, Avenue Escadrille
Normandie-Niémen, 13397 Marseille Cedex 20, France
| | - Masaaki Fujii
- Chemical Spectroscopy Division,
Chemical Resources Laboratory, Tokyo Institute of Technology, 4259-R1-15, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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10
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Tan EMM, Amirjalayer S, Bakker BH, Buma WJ. Excited state dynamics of Photoactive Yellow Protein chromophores elucidated by high-resolution spectroscopy and ab initio calculations. Faraday Discuss 2013; 163:321-40; discussion 393-432. [DOI: 10.1039/c2fd20139a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Smolarek S, Vdovin A, Rijs A, van Walree CA, Zgierski MZ, Buma WJ. High-Resolution Spectroscopy of Jet-Cooled 1,1′-Diphenylethylene: Electronically Excited and Ionic States of a Prototypical Cross-Conjugated System. J Phys Chem A 2011; 115:9399-410. [DOI: 10.1021/jp111127g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Szymon Smolarek
- University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Alexander Vdovin
- University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Anouk Rijs
- FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands
| | - Cornelis A. van Walree
- Department of Chemistry, Faculty of Science, Utrecht University, Sorbonnelaan 16, 3584 CH Utrecht, The Netherlands
| | - Marek Z. Zgierski
- Steacie Institute for Molecular Science, National Research Council of Canada, Ottawa K1A 0R6, Canada
| | - Wybren J. Buma
- University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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12
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Smolarek S, Vdovin A, Tan EMM, Buma WJ. Vibrational and Electronic Spectroscopy of the 4-Hydroxystyrene−CO2 Cluster and Its Hydrate: A para-Coumaric Acid Impostor. J Phys Chem B 2011; 115:1275-81. [DOI: 10.1021/jp109895c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Szymon Smolarek
- University of Amsterdam, Science Park 904, 1098 XH Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
| | - Alexander Vdovin
- University of Amsterdam, Science Park 904, 1098 XH Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
| | - Eric M. M. Tan
- University of Amsterdam, Science Park 904, 1098 XH Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
| | - Wybren J. Buma
- University of Amsterdam, Science Park 904, 1098 XH Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
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13
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Pino GA, Alata I, Dedonder C, Jouvet C, Sakota K, Sekiya H. Photon induced isomerization in the first excited state of the 7-azaindole–(H2O)3 cluster. Phys Chem Chem Phys 2011; 13:6325-31. [DOI: 10.1039/c1cp00015b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Guin M, Maity S, Patwari GN. Infrared-optical double resonance spectroscopic measurements on 2-(2'-pyridyl)benzimidazole and its hydrogen bonded complexes with water and methanol. J Phys Chem A 2010; 114:8323-30. [PMID: 20701339 DOI: 10.1021/jp104952v] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The H(2)O and MeOH complexes of 2-(2'-pyridyl)benzimidazole (2PBI) were investigated using laser induced fluorescence and IR-UV double resonance spectroscopic techniques. The 0(0)(0) band for the S(1) <-- S(0) electronic transition of 2PBI was observed at 31,616 cm(-1), and corresponding transitions for the H(2)O and MeOH complexes show substantial red shifts of 1059 and 1203 cm(-1), respectively. A long progression up to v' = 5 in the 92 cm(-1) vibrational mode was observed for bare 2PBI, which is considerably shortened to v' = 2 and v' = 1 for the H(2)O and MeOH complexes, respectively. The combined experimental and theoretical results suggest that both H(2)O and MeOH form cyclic complex with 2PBI incorporating N-H...O and O-H...N hydrogen bonds. Comparison with other known hydrogen-bonded H(2)O complexes of bifunctional aza-heteroaromatic molecules suggest that 2PBI-H(2)O is probably one of the strongest of all known complexes. Further, the experimental data in combination with calculations suggests that the hydrogen atom/proton transfer leading to tautomeric form might be thermodynamically spontaneous in the electronic excited state, due to explicit solvent (H(2)O and MeOH) participation.
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Affiliation(s)
- Mridula Guin
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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15
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Wiosna-Sałyga G, Nosenko Y, Kijak M, Thummel RP, Brutschy B, Waluk J. Structure and Hydrogen-Bond Vibrations of Water Complexes of Azaaromatic Compounds: 7-(3′-Pyridyl)indole. J Phys Chem A 2009; 114:3270-9. [DOI: 10.1021/jp909409d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gabriela Wiosna-Sałyga
- Institute of Physical and Theoretical Chemistry, University of Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/M, Germany, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland
| | - Yevgeniy Nosenko
- Institute of Physical and Theoretical Chemistry, University of Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/M, Germany, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland
| | - Michał Kijak
- Institute of Physical and Theoretical Chemistry, University of Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/M, Germany, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland
| | - Randolph P. Thummel
- Institute of Physical and Theoretical Chemistry, University of Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/M, Germany, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland
| | - Bernhard Brutschy
- Institute of Physical and Theoretical Chemistry, University of Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/M, Germany, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland
| | - Jacek Waluk
- Institute of Physical and Theoretical Chemistry, University of Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/M, Germany, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland
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16
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Newby JJ, Liu CP, Müller CW, James WH, Buchanan EG, Lee HD, Zwier TS. Spectroscopy and Photophysics of Structural Isomers of Naphthalene: Z-Phenylvinylacetylene. J Phys Chem A 2009; 114:3190-8. [PMID: 20020748 DOI: 10.1021/jp909243y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Josh J. Newby
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - Ching-Ping Liu
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - Christian W. Müller
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - William H. James
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - Evan G. Buchanan
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - Hsiupu D. Lee
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - Timothy S. Zwier
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
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17
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Esboui M, Jouvet C, Dedonder C, Ebata T. Excited-State Dynamics of the 2-Hydroxypyridine−Ammonia Complex. J Phys Chem A 2009; 114:3060-6. [DOI: 10.1021/jp906652y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Esboui
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia, Laboratoire de Photophysique Moléculaire du CNRS et Centre laser de l’Université Paris-Sud (CLUPS), Université Paris-Sud 11, 91405 Orsay, France, and Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - C. Jouvet
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia, Laboratoire de Photophysique Moléculaire du CNRS et Centre laser de l’Université Paris-Sud (CLUPS), Université Paris-Sud 11, 91405 Orsay, France, and Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - C. Dedonder
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia, Laboratoire de Photophysique Moléculaire du CNRS et Centre laser de l’Université Paris-Sud (CLUPS), Université Paris-Sud 11, 91405 Orsay, France, and Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - T. Ebata
- Laboratoire de Spectroscopie Atomique, Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia, Laboratoire de Photophysique Moléculaire du CNRS et Centre laser de l’Université Paris-Sud (CLUPS), Université Paris-Sud 11, 91405 Orsay, France, and Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
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18
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Carrera A, Nielsen IB, Carçabal P, Dedonder C, Broquier M, Jouvet C, Domcke W, Sobolewski AL. Biradicalic excited states of zwitterionic phenol-ammonia clusters. J Chem Phys 2009; 130:024302. [PMID: 19154023 DOI: 10.1063/1.3054292] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Phenol-ammonia clusters with more than five ammonia molecules are proton transferred species in the ground state. In the present work, the excited states of these zwitterionic clusters have been studied experimentally with two-color pump probe methods on the nanosecond time scale and by ab initio electronic-structure calculations. The experiments reveal the existence of a long-lived excited electronic state with a lifetime in the 50-100 ns range, much longer than the excited state lifetime of bare phenol and small clusters of phenol with ammonia. The ab initio calculations indicate that this long-lived excited state corresponds to a biradicalic system, consisting of a phenoxy radical that is hydrogen bonded to a hydrogenated ammonia cluster. The biradical is formed from the locally excited state of the phenolate anion via an electron transfer process, which neutralizes the charge separation of the ground state zwitterion.
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Affiliation(s)
- A Carrera
- University of Buenos Aires, Ciudad Universitaria, 3er piso, Pab. II, 1428 Buenos Aires, Argentina
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19
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Oldani AN, Ferrero JC, Pino GA. Effect of the intermolecular hydrogen bond conformation on the structure and reactivity of the p-cresol(H2O)(NH3) van der Waals complex. Phys Chem Chem Phys 2009; 11:10409-16. [DOI: 10.1039/b916901f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Pillsbury NR, Stearns JA, Müller CW, Plusquellic DF, Zwier TS. State-specific studies of internal mixing in a prototypical flexible bichromophore: Diphenylmethane. J Chem Phys 2008; 129:114301. [DOI: 10.1063/1.2977730] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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21
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Koizumi Y, Jouvet C, Norihiro T, Ishiuchi SI, Dedonder-Lardeux C, Fujii M. Electronic spectra of 7-azaindole/ammonia clusters and their photochemical reactivity. J Chem Phys 2008; 129:104311. [DOI: 10.1063/1.2970936] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Vendrell O, Gelabert R, Moreno M, Lluch JM. A Potential Energy Function for Heterogeneous Proton-Wires. Ground and Photoactive States of the Proton-Wire in the Green Fluorescent Protein. J Chem Theory Comput 2008; 4:1138-50. [DOI: 10.1021/ct800075w] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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23
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Thut M, Tanner C, Steinlin A, Leutwyler S. Time-Dependent Density Functional Theory As a Tool for Isomer Assignments of Hydrogen-Bonded Solute·Solvent Clusters. J Phys Chem A 2008; 112:5566-72. [DOI: 10.1021/jp801044x] [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)
- Markus Thut
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
| | - Christian Tanner
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
| | - Andreas Steinlin
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
| | - Samuel Leutwyler
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
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24
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Kijak M, Nosenko Y, Singh A, Thummel RP, Brutschy B, Waluk J. Ground and excited state vibrations of 2-(2′-pyridyl)pyrrole. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2007.05.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Panda D, Datta A. The role of the ring nitrogen and the amino group in the solvent dependence of the excited-state dynamics of 3-aminoquinoline. J Chem Phys 2007; 125:054513. [PMID: 16942232 DOI: 10.1063/1.2232199] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The nonradiative rate in 3-aminoquinoline is found to exhibit anomalous solvent dependence, being rather fast in nonpolar solvents and remarkably slower in more polar and especially, more protic ones. The cause of such behavior is investigated by studying the dependence of fluorescence spectral and temporal parameters on the solvent properties such as polarity and hydrogen bonding ability. Complementary quantum mechanical calculations have been performed and the picture that emerges from these studies is that of an excited state with a short radiative lifetime due to the flipping of the amino group. This state is selectively populated in nonpolar, nonhydrogen bonding solvents, but is destabilized with respect to the more polar intramolecular charge transfer (ICT) state in polar solvents and even more so in protic solvents and dimethylsulfoxide. The slower nonradiative rates in the ICT state is attributed to the more restricted motion of the amino group in this state. The role of hydrogen bonding of the amino group and the ring nitrogen in stabilization/destabilization of the ICT state and therefore on the nonradiative rate is also explored.
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Affiliation(s)
- Debashis Panda
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
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26
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Fernández-Ramos A, Martínez-Núñez E, Vázquez SA, Ríos MA, Estévez CM, Merchán M, Serrano-Andrés L. Hydrogen Transfer vs Proton Transfer in 7-Hydroxy-quinoline·(NH3)3: A CASSCF/CASPT2 Study. J Phys Chem A 2007; 111:5907-12. [PMID: 17566997 DOI: 10.1021/jp072575p] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Multiconfigurational CASSCF and CASPT2 calculations were performed to investigate the enol --> keto tautomerization in the lowest singlet excited state of the 7-hydroxyquinoline.(NH3)3 cluster. Two different reaction mechanisms were explored. The first one corresponds to that proposed previously by Tanner et al. (Science 2003, 302, 1736) on the basis of experimental observations and CASSCF optimizations under Cs-symmetry constraints. This mechanism comprises four consecutive steps and involves nonadiabatic transitions between the valence 1pipi* state and a pisigma* Rydberg-type state, resulting in hydrogen-atom transfer. Single-point CASPT2 calculations corroborate that for Cs-symmetry pathways hydrogen-atom transfer is clearly preferred over proton transfer. The second mechanism, predicted by CASSCF optimizations without constraints, implies proton transfer along a pathway on the 1pipi* surface in which one or more ammonia molecules depart significantly from the molecular plane defined by the hydroxyquinoline ring. The results suggest that both mechanisms may be competitive with proton transfer being somewhat favorable over hydrogen-atom transfer.
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Affiliation(s)
- Antonio Fernández-Ramos
- Departamento de Química Física, Facultade de Química, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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27
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Sakota K, Inoue N, Komoto Y, Sekiya H. Cooperative triple-proton/hydrogen atom relay in 7-azaindole(CH3OH)2 in the gas phase: remarkable change in the reaction mechanism from vibrational-mode specific to statistical fashion with increasing internal energy. J Phys Chem A 2007; 111:4596-603. [PMID: 17487992 DOI: 10.1021/jp070359a] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The 7-azaindole-methanol 1:2 cluster [7AI(CH(3)OH)2] undergoes excited-state triple-proton/hydrogen atom transfer (ESTPT/HT) along the hydrogen-bonded network in the gas phase. The measurements of the resonance-enhanced multiphoton ionization (REMPI) spectra of 7AI(CH(3)OH)2-d(n) (n = 0-3), where subscript n indicates the number of deuterium, and the fluorescence excitation spectrum of 7AI(CH(3)OH)2-d(0) allowed us to investigate the ESTPT/HT dynamics. By comparing the intensity ratios of the vibronic bands between 7AI(CH(3)OH)2-d(0) and 7AI(CH(3)OH)2-d(3) in REMPI spectra, we obtained the lower limit of an acceleration factor (f(a)(low)) of 7AI(CH(3)OH)2-d(0), which is the ratio of the reaction rate for the excitation of a vibronic state to that of the zero-point state in S(1). The f(a)(low) values are 2.7 +/- 0.83 and 4.0 +/- 1.2 for an in-phase intermolecular stretching vibration (sigma(1)) and its overtone (2sigma(1)) observed at 181 cm(-1) and 359 cm(-1) in the excitation spectrum, respectively, while that of the vibration (nu(2)/sigma(1) or nu(3)/sigma(1)) at 228 cm(-1) is 1.1 +/- 0.83. Thus, vibrational-mode-specific ESTPT/HT occurs in the low-energy region (600 cm(-1)). The excitation of an intramolecular ring mode (nu(intra)) of 7AI at 744 cm(-1) substantially enhances the reaction rate (f(a)(low) = 4.4 +/- 0.98), but the increase of f(a)(low) is not prominent for the excitation of v(intra) + sigma(1) at 926 cm(-1) (f(a)(low) = 5.0 +/- 1.6), although the sigma(1) mode is excited. These results suggest that the ESTPT/HT reaction in 7AI(CH(3)OH)2-d(0) directly proceeds from the photoexcited states with the internal energy less than approximately 600 cm(-1), but it occurs from the isoenergetically vibrational-energy redistributed states when the internal energy is large. This shows a remarkable feature of ESTPT/HT in 7AI(CH(3)OH)2; the nature of the reaction mechanism changes from vibrational-mode specific to statistical fashion with increasing the internal energy. The hydrogen-bonded network in 7AI(CH(3)OH)2-d(0) is represented by a directed graph. This shows that ESTPT/HT is one of the simplest examples of cooperative phenomena.
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Affiliation(s)
- Kenji Sakota
- Department of Chemistry, Faculty of Sciences, and Department of Molecular Chemistry, Graduate School of Science, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
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28
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Sun D, Fang J, Yu G, Ma F. Intramolecular hydrogen bonding and photoinduced intramolecular proton and electron transfer in 2-(2′-hydroxyphenyl)benzothiazole. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2006.11.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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29
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Kyrychenko A, Waluk J. Excited-state proton transfer through water bridges and structure of hydrogen-bonded complexes in 1H-pyrrolo[3,2-h]quinoline: adiabatic time-dependent density functional theory study. J Phys Chem A 2007; 110:11958-67. [PMID: 17064184 DOI: 10.1021/jp063426u] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Proton transfer reaction is studied for 1H-pyrrolo[3,2-h]quinoline-water complexes (PQ-(H(2)O)(n), n = 0-2) in the ground and the lowest excited singlet states at the density functional theory (DFT) level. Cyclic hydrogen-bonded complexes are considered, in which water molecules form a bridge connecting the proton donor (pyrrole NH group) and acceptor (quinoline nitrogen) atoms. To understand the effect of the structure and length of water bridges on the excited-state tautomerization in PQ, the potential energy profile of the lowest excited singlet state is calculated adiabatically by the time-dependent DFT (TDDFT) method. The S(0) --> S(1) excitation of PQ is accompanied by significant intramolecular transfer of electron density from the pyrrole ring to the quinoline fragment, so that the acidity of the N-H group and the basicity of the nitrogen atom of the quinoline moiety are increased. These excited-state acid-base changes introduce a driving force for the proton transfer reaction. The adiabatic TDDFT calculations demonstrate, however, that the phototautomerization requires a large activation energy in the isolated PQ molecule due to a high energy barrier separating the normal form and the tautomer. In the 1:1 cyclic PQ-H(2)O complex, the energy barrier is dramatically reduced, so that upon excitation of this complex the tautomerization can occur rapidly in one step as concerted asynchronous movements of the two protons assisted by the water molecule. In the PQ-(H(2)O)(2) solvate two water molecules form a cyclic bridge with sterically strained and unfavorable hydrogen bonds. As a result, some extra activation energy is needed for initiating the proton dislocation along the longer hydrogen-bond network. The full tautomerization in this complex is still possible; however, the cooperative proton transfer is found to be highly asynchronous. Large relaxation and reorganization of the hydrogen-bonded water bridge in PQ-(H(2)O)(2) are required during the proton translocation from the pyrrole NH group to the quinoline nitrogen; this may block the complete tautomerization in this type of solvate.
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Affiliation(s)
- A Kyrychenko
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44, 01-224 Warsaw, Poland
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30
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Alkorta I, Elguero J, Zborowski K. Chiral Recognition in Diaziridine Clusters and the Problem of Racemization Waves. J Phys Chem A 2007; 111:1096-103. [PMID: 17286362 DOI: 10.1021/jp0669916] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Theoretical calculations (B3LYP/6-31+G**) of chiral clusters of diaziridines have been carried out. Five configurations of chiral and nonchiral clusters with up to eight monomers have been considered. The proton transfer within the neutral and protonated clusters has been studied as a possible source of racemization waves. The optical rotatory power (ORP) has been calculated for the neutral and protonated homochiral clusters. The results show that the clusters with alternated chiral molecules are the preferred ones and that the proton transfer proceeds with low energetic barriers in the protonated systems. The ORP results are very dependent on the shape of the clusters and the neutral or protonated state of them.
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Affiliation(s)
- Ibon Alkorta
- Instituto de Quimica Médica (C.S.I.C), Juan de la Cierva, 3, 28006-Madrid, Spain.
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31
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Gil M, Waluk J. Vibrational Gating of Double Hydrogen Tunneling in Porphycene. J Am Chem Soc 2007; 129:1335-41. [PMID: 17263418 DOI: 10.1021/ja066976e] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A procedure that enables determining the reaction rate from the analysis of fluorescence anisotropy is described and applied to the investigation of double hydrogen transfer between inner-cavity nitrogen atoms in electronically excited porphycene. Tautomerization proceeds as a thermally activated synchronous double hydrogen tunneling. The barrier to the reaction is dynamically modulated by a vibration that simultaneously changes the strength of two intramolecular hydrogen bonds. Different mechanisms of tautomerization in porphycene and its parent isomer, porphyrin, can be understood by analyzing the potentials for hydrogen transfer.
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Affiliation(s)
- Michał Gil
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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32
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Georgieva I, Trendafilova N, Aquino AJA, Lischka H. Excited-State Proton Transfer in 7-Hydroxy-4-methylcoumarin along a Hydrogen-Bonded Water Wire. J Phys Chem A 2006; 111:127-35. [PMID: 17201395 DOI: 10.1021/jp0662202] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
TDDFT, RI-CC2, and CIS calculations have been performed for the nondissociative excited-state proton transfer (ESPT) in the S1 state of 7-hydroxy-4-methylcoumarin (7H4MC) along a H-bonded water wire of three water molecules bridging the proton donor (OH) and the proton acceptor (C[double bond]O) groups (7H4MC.(H2O)3). The observed structural reorganization in the water-wire cluster is interpreted as a proton-transfer (PT) reaction along the H2O solvent wire. The shift of electron density within the organic chromophore 7H4MC due to the optical excitation appears to be the driving force for ESPT. All the methods used show that the reaction path occurs in the 1pipi* state, and no crossing with a Rydberg-type 1pisigma* state is found. TDDFT and RI-CC2 calculations predict an exoergic reaction of the excited-state enol-to-keto transformation. The S1 potential energy curve reveals well-defined Cs minima of enol- and keto-clusters, separated by a single barrier with a height of 17-20 kcal/mol. After surmounting this barrier, spontaneous PT along the water wire is observed, leading without any further barrier to the keto structure. The TDDFT and RI-CC2 methods appear to be reliable approaches to describe the energy surfaces of ESPT. The CIS method predicts an endoergic ESPT reaction and an energy barrier, which is too high.
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Affiliation(s)
- Ivelina Georgieva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria
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Tanner C, Thut M, Steinlin A, Manca C, Leutwyler S. Excited-State Hydrogen-Atom Transfer along Solvent Wires: Water Molecules Stop the Transfer. J Phys Chem A 2006; 110:1758-66. [PMID: 16451005 DOI: 10.1021/jp056151b] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Excited-state hydrogen-atom transfer (ESHAT) along a hydrogen-bonded solvent wire occurs for the supersonically cooled n = 3 ammonia-wire cluster attached to the scaffold molecule 7-hydroxyquinoline (7HQ) [Tanner, C.; et al. Science 2003, 302, 1736]. Here, we study the analogous three-membered solvent-wire clusters 7HQ.(NH3)n.(H2O)m, n + m = 3, using resonant two-photon ionization (R2PI) and UV-UV hole-burning spectroscopies. Substitution of H2O for NH3 has a dramatic effect on the excited-state H-atom transfer: The threshold for the ESHAT reaction is approximately 200 cm(-1) for 7HQ.(NH3)3, approximately 350 cm(-1) for both isomers of the 7HQ.(NH3)2.H2O cluster, and approximately 600 cm(-1) for 7HQ.NH3.(H2O)2 but increases to approximately 2000 cm(-1) for the pure 7HQ.(H2O)3 water-wire cluster. To understand the effect of the chemical composition of the solvent wire on the H-atom transfer, the reaction profiles of the low-lying electronic excited states of the n = 3 pure and mixed solvent-wire clusters are calculated with the configuration interaction singles (CIS) method. For those solvent wires with an NH3 molecule at the first position, injection of the H atom into the wire can occur by tunneling. However, further H-atom transfer is blocked by a high barrier at the first (and second) H2O molecule along the solvent wire. H-atom transfer along the entire length of the solvent wire, leading to formation of the 7-ketoquinoline (7KQ) tautomer, cannot occur for any of the H2O-containing clusters, in agreement with experimentally observed absence of 7KQ fluorescence.
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Affiliation(s)
- Christian Tanner
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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34
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Manca† C, Tanner C, Leutwyler S. Excited state hydrogen atom transfer in ammonia-wire and water-wire clusters. INT REV PHYS CHEM 2005. [DOI: 10.1080/01442350500390912] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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35
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Tanner C, Manca C, Leutwyler S. Exploring excited-state hydrogen atom transfer along an ammonia wire cluster: Competitive reaction paths and vibrational mode selectivity. J Chem Phys 2005; 122:204326. [PMID: 15945743 DOI: 10.1063/1.1924410] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The excited-state hydrogen-atom transfer (ESHAT) reaction of the 7-hydroxyquinoline(NH(3))(3) cluster involves a crossing from the initially excited (1)pipi(*) to a (1)pisigma(*) state. The nonadiabatic coupling between these states induces homolytic dissociation of the O-H bond and H-atom transfer to the closest NH(3) molecule, forming a biradical structure denoted HT1, followed by two more Grotthus-type translocation steps along the ammonia wire. We investigate this reaction at the configuration interaction singles level, using a basis set with diffuse orbitals. Intrinsic reaction coordinate calculations of the enol-->HT1 step predict that the H-atom transfer is preceded and followed by extensive twisting and bending of the ammonia wire, as well as large O-H...NH(3) hydrogen bond contraction and expansion. The calculations also predict an excited-state proton transfer path involving synchronous proton motions; however, it lies 20-25 kcal/mol above the ESHAT path. Higher singlet and triplet potential curves are calculated along the ESHAT reaction coordinate: Two singlet-triplet curve crossings occur within the HT1 product well and intersystem crossing to these T(n) states branches the reaction back to the enol reactant side, decreasing the ESHAT yield. In fact, a product yield of approximately 40% 7-ketoquinoline.(NH(3))(3) is experimentally observed. The vibrational mode selectivity of the enol-->HT1 reaction step [C. Manca, C. Tanner, S. Coussan, A. Bach, and S. Leutwyler, J. Chem. Phys. 121, 2578 (2004)] is shown to be due to the large sensitivity of the diffuse pisigma(*) state to vibrational displacements along the intermolecular coordinates.
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Affiliation(s)
- Christian Tanner
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland
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Müller A, Frey JA, Leutwyler S. Probing the Watson−Crick, Wobble, and Sugar-Edge Hydrogen Bond Sites of Uracil and Thymine. J Phys Chem A 2005; 109:5055-63. [PMID: 16833858 DOI: 10.1021/jp0446027] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The nucleobases uracil (U) and thymine (T) offer three hydrogen-bonding sites for double H-bond formation via neighboring N-H and C=O groups, giving rise to the Watson-Crick, wobble and sugar-edge hydrogen bond isomers. We probe the hydrogen bond properties of all three sites by forming hydrogen bonded dimers of U, 1-methyluracil (1MU), 3-methyluracil (3MU), and T with 2-pyridone (2PY). The mass- and isomer-specific S1 <-- S0 vibronic spectra of 2PY.U, 2PY.3MU, 2PY.1MU, and 2PY.T were measured using UV laser resonant two-photon ionization (R2PI). The spectra of the Watson-Crick and wobble isomers of 2PY.1MU were separated using UV-UV spectral hole-burning. We identify the different isomers by combining three different diagnostic tools: (1) Selective methylation of the uracil N3-H group, which allows formation of the sugar-edge isomer only, and methylation of the N1-H group, which leads to formation of the Watson-Crick and wobble isomers. (2) The experimental S1 <-- S0 origins exhibit large spectral blue shifts relative to the 2PY monomer. Ab initio CIS calculations of the spectral shifts of the different hydrogen-bonded dimers show a linear correlation with experiment. This correlation allows us to identify the R2PI spectra of the weakly populated Watson-Crick and wobble isomers of both 2PY.U and 2PY.T. (3) PW91 density functional calculation of the ground-state binding and dissociation energies De and D0 are in agreement with the assignment of the dominant hydrogen bond isomers of 2PY.U, 2PY.3MU and 2PY.T as the sugar-edge form. For 2PY.U, 2PY.T and 2PY.1MU the measured wobble:Watson-Crick:sugar-edge isomer ratios are in good agreement with the calculated ratios, based on the ab initio dissociation energies and gas-phase statistical mechanics. The Watson-Crick and wobble isomers are thereby determined to be several kcal/mol less strongly bound than the sugar-edge isomers. The 36 observed intermolecular frequencies of the nine different H-bonded isomers give detailed insight into the intermolecular force field.
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Affiliation(s)
- Andreas Müller
- Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
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