1
|
Koga M, Kang DH, Heim ZN, Meyer P, Erickson BA, Haldar N, Baradaran N, Havenith M, Neumark DM. Extreme ultraviolet time-resolved photoelectron spectroscopy of adenine, adenosine and adenosine monophosphate in a liquid flat jet. Phys Chem Chem Phys 2024; 26:13106-13117. [PMID: 38629206 DOI: 10.1039/d4cp00856a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Time-resolved photoelectron spectroscopy using an extreme-ultraviolet (XUV) probe pulse was used to investigate the UV photoinduced dynamics of adenine (Ade), adenosine (Ado), and adenosine-5-monophosphate (AMP) in a liquid water jet. In contrast to previous studies using UV probe pulses, the XUV pulse at 21.7 eV can photoionize all excited states of a molecule, allowing for full relaxation pathways to be addressed after excitation at 4.66 eV. This work was carried out using a gas-dynamic flat liquid jet, resulting in considerably enhanced signal compared to a cylindrical jet. All three species decay on multiple time scales that are assigned based on their decay associated spectra; the fastest decay of ∼100 fs is assigned to ππ* decay to the ground state, while a smaller component with a lifetime of ∼500 fs is attributed to the nπ* state. An additional slower channel in Ade is assigned to the 7H Ade conformer, as seen previously. This work demonstrates the capability of XUV-TRPES to disentangle non-adiabatic dynamics in an aqueous solution in a state-specific manner and represents the first identification of the nπ* state in the relaxation dynamics of adenine and its derivatives.
Collapse
Affiliation(s)
- Masafumi Koga
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
| | - Do Hyung Kang
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
| | - Zachary N Heim
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
| | - Philipp Meyer
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801, Germany
| | - Blake A Erickson
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
| | - Neal Haldar
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
| | - Negar Baradaran
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
| | - Martina Havenith
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801, Germany
| | - Daniel M Neumark
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| |
Collapse
|
2
|
Gate G, Williams A, Boldissar S, Šponer J, Szabla R, de Vries M. The tautomer-specific excited state dynamics of 2,6-diaminopurine using resonance-enhanced multiphoton ionization and quantum chemical calculations. Photochem Photobiol 2024; 100:404-418. [PMID: 38124372 DOI: 10.1111/php.13897] [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: 06/28/2023] [Revised: 10/25/2023] [Accepted: 11/14/2023] [Indexed: 12/23/2023]
Abstract
2,6-Diaminopurine (2,6-dAP) is an alternative nucleobase that potentially played a role in prebiotic chemistry. We studied its excited state dynamics in the gas phase by REMPI, IR-UV hole burning, and ps pump-probe spectroscopy and performed quantum chemical calculations at the SCS-ADC(2) level of theory to interpret the experimental results. We found the 9H tautomer to have a small barrier to ultrafast relaxation via puckering of its 6-membered ring. The 7H tautomer has a larger barrier to reach a conical intersection and also has a sizable triplet yield. These results are discussed relative to other purines, for which 9H tautomerization appears to be more photostable than 7H and homosubstituted purines appear to be less photostable than heterosubstituted or singly substituted purines.
Collapse
Affiliation(s)
- Gregory Gate
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, USA
| | - Ann Williams
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, USA
| | - Samuel Boldissar
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, USA
| | - Jiří Šponer
- Institute of Biophysics of the Czech Academy of Sciences, Brno, Czech Republic
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacky University Olomouc, Olomouc-Holice, Czech Republic
| | - Rafal Szabla
- Institute of Advanced Materials, Faculty of Chemistry, Wrocław University of Science and Technology, Wrocław, Poland
| | - Mattanjah de Vries
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, USA
| |
Collapse
|
3
|
Lamas I, Montero R, Martínez-Martínez V, Longarte A. Photodynamics of azaindoles in polar media: the influence of the environment. Phys Chem Chem Phys 2024; 26:3240-3252. [PMID: 38193884 DOI: 10.1039/d3cp03412g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
We have studied the relaxation dynamics of a family of azaindole (AI) structural isomers, 4-, 5-, 6- and 7-AI, by steady-state and time-resolved methods (fs-transient absorption and fluorescence up-conversion), in solvents of different polarity. The measurements in aprotic solvents show distinctive fluorescence yields and excited state lifetimes among the isomers, which are tuned by the polarity of the medium. Guided by simple TD-DFT calculations and based on the behavior observed in the isolated species, it has been possible to address the influence of the environment polarity on the relaxation route. According to the obtained picture, the energy of the nπ* state, which is strongly dependent on the position of the pyridinic nitrogen, controls the rate of the internal conversion channel that accounts for the distinctive photophysical behavior of the isomers. On the other hand, preliminary measurements in protic media (methanol) show a very different photodynamical behavior, in which the anomalous measured fluorescent patterns are very likely the result of reactive channels (proton transfer) triggered by the electronic excitation.
Collapse
Affiliation(s)
- Iker Lamas
- Departamento de Química-Física Facultad de Ciencia y Tecnología. Universidad del País Vasco (UPV/EHU) Apart. 644, 48080 Bilbao, Spain.
| | - Raúl Montero
- SGIKER Laser Facility Facultad de Ciencia y Tecnología. Universidad del País Vasco (UPV/EHU) 48940, Leioa, Spain.
| | - Virginia Martínez-Martínez
- Departamento de Química-Física Facultad de Ciencia y Tecnología. Universidad del País Vasco (UPV/EHU) Apart. 644, 48080 Bilbao, Spain.
| | - Asier Longarte
- Departamento de Química-Física Facultad de Ciencia y Tecnología. Universidad del País Vasco (UPV/EHU) Apart. 644, 48080 Bilbao, Spain.
| |
Collapse
|
4
|
Shahrokh L, Omidyan R, Azimi G. Excited State Deactivation Mechanisms of Protonated Adenine: a Theoretical study. Phys Chem Chem Phys 2022; 24:14898-14908. [DOI: 10.1039/d2cp00106c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quantum chemical computational method as well as the adiabatic dynamics simulation have been employed to investigate the non-radiative relaxation mechanism of protonated 9H- and 7H-adenine (AH+). We have located three...
Collapse
|
5
|
Abstract
Aggregation-induced emission (AIE), usually referring to the phenomenon in which molecules emit more strongly in the aggregate state than in the solution state, is intriguing and promising in various optoelectronic and biosensing applications. In this Perspective, the basic principles that can lead to AIE and experimental evidence to reveal the AIE mechanism of tetraphenyl ethylene (TPE)-type molecules are discussed. AIE is the consequence of two factors: (1) the fast energy dissipation by crossing a conical intersection (CI) in solutions but not in solids results in low luminescence efficiencies in the solutions, and (2) the weak intermolecular coupling and thus slow intermolecular energy/charge transfers in the AIE solids effectively prevent quenching and result in relatively high luminescence efficiencies. The key to AIE is that the luminescence efficiency is tuned by controlling molecules to cross or not to cross a CI by changing the phase of molecules. How fast a molecule can cross a CI is dependent on the energy barrier of isomerization, which can be tuned in many ways, including mechanical or electrical stimuli, in addition to changing phases. Barrier-dependent crossing CI also results in a very important consequence: excitation-wavelength-dependent fluorescence yield within one electronic excited state, an anti-Vavilov's rule phenomenon. In principle, there can be an alternative way to tune luminescence efficiency by manipulating the formation of CIs instead of crossing or not crossing them. This approach relies on the fact that the electronic ground state and the excited state have many different properties, e.g., dipole moment. By tuning the environment, e.g., dielectric constant, to favor or disfavor one state, one may be able to lift or lower the potential surface of one state so that the potential surfaces of two states can vary between intersected and not contacted.
Collapse
Affiliation(s)
- Jianxin Guan
- College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| | - Chengzhen Shen
- College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| | - Jie Peng
- College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| | - Junrong Zheng
- College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| |
Collapse
|
6
|
Camiruaga A, Usabiaga I, D'mello VC, García GA, Wategaonkar S, Fernández JA. Revisiting the spectroscopy of xanthine derivatives: theobromine and theophylline. Phys Chem Chem Phys 2019; 21:26430-26437. [PMID: 31774088 DOI: 10.1039/c9cp05068j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We explore the influence of the relative position of the methyl substituent on the photophysics of theophylline and theobromine, two molecules that are structurally related to the DNA bases. Using a combination of spectroscopic techniques and quantum mechanical calculations, we show that moving the methyl group from N1 in theophylline to N7 in theobromine causes significant differences in their excited state properties, i.e., it produces pyramidalization of N7 in the excited state of the latter. Paradoxically, this modification seems to have little effect on the structural properties of the cation and the ionization process. It is suggested that similar effects may exist in the excited state properties of DNA bases.
Collapse
Affiliation(s)
- Ander Camiruaga
- Dep. of Physical Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), Barrio Sarriena s/n, Leioa 48940, Spain.
| | | | | | | | | | | |
Collapse
|
7
|
Stange UC, Temps F. Ultrafast electronic deactivation of UV-excited adenine and its ribo- and deoxyribonucleosides and -nucleotides: A comparative study. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.08.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
8
|
Zhao HY, Lau KC, Garcia GA, Nahon L, Carniato S, Poisson L, Schwell M, Al-Mogren MM, Hochlaf M. Unveiling the complex vibronic structure of the canonical adenine cation. Phys Chem Chem Phys 2018; 20:20756-20765. [PMID: 29989120 DOI: 10.1039/c8cp02930j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Adenine, a DNA base, exists as several tautomers and isomers that are closely lying in energy and that may form a mixture upon vaporization of solid adenine. Indeed, it is challenging to bring adenine into the gas phase, especially as a unique tautomer. The experimental conditions were tuned to prepare a jet-cooled canonical adenine (9H-adenine). This isolated DNA base was ionized by single VUV photons from a synchrotron beamline and the corresponding slow photoelectron spectrum was compared to ab initio computations of the neutral and ionic species. We report the vibronic structure of the X+ 2A'' (D0), A+ 2A' (D1) and B+ 2A'' (D2) electronic states of the 9H adenine cation, from the adiabatic ionization energy (AIE) up to AIE + 1.8 eV. Accurate AIEs are derived for the 9H-adenine (X[combining tilde] 1A') + hν → 9H-adenine+ (X+ 2A'', A+ 2A', B+ 2A'') + e- transitions. Close to the AIE, we fully assign the rich vibronic structure solely to the 9H-adenine (X 1A') + hν → 9H-adenine+ (X+ 2A'') transition. Importantly, we show that the lowest cationic electronic states of canonical adenine are coupled vibronically. The present findings are important for understanding the effects of ionizing radiation and the charge distribution on this elementary building block of life, at ultrafast, short, and long timescales.
Collapse
Affiliation(s)
- Hong Yan Zhao
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Lee SY, Kang H. Nonresonant Contribution in Pump-Probe Transient Ion Signal of Adenine. B KOREAN CHEM SOC 2018. [DOI: 10.1002/bkcs.11402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sang Yoon Lee
- Department of Biomedical Sciences and Chronic Inflammatory Disease Research Center; Ajou University School of Medicine; Suwon 16499 South Korea
| | - Hyuk Kang
- Department of Chemistry; Ajou University; Suwon 16499 South Korea
| |
Collapse
|
10
|
Marchetti B, Karsili TNV, Ashfold MNR, Domcke W. A 'bottom up', ab initio computational approach to understanding fundamental photophysical processes in nitrogen containing heterocycles, DNA bases and base pairs. Phys Chem Chem Phys 2018; 18:20007-27. [PMID: 26980149 DOI: 10.1039/c6cp00165c] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The availability of non-radiative decay mechanisms by which photoexcited molecules can revert to their ground electronic state, without experiencing potentially deleterious chemical transformation, is fundamental to molecular photostability. This Perspective Article combines results of new ab initio electronic structure calculations and prior experimental data in an effort to systematise trends in the non-radiative decay following UV excitation of selected families of heterocyclic molecules. We start with the prototypical uni- and bicyclic molecules phenol and indole, and explore the structural and photophysical consequences of incorporating progressively more nitrogen atoms within the respective ring structures en route to the DNA bases thymine, cytosine, adenine and guanine. For each of the latter, we identify low energy non-radiative decay pathways via conical intersections with the ground state potential energy surface accessed by out-of-plane ring deformations. This is followed by summary descriptions and illustrations of selected rival (electron driven H atom transfer) non-radiative excited state decay processes that demand consideration once the nucleobases are merely components in larger biomolecular systems like nucleosides, and both individual and stacked base-pairs.
Collapse
Affiliation(s)
- Barbara Marchetti
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Tolga N V Karsili
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK. and Department of Chemistry, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany
| | - Michael N R Ashfold
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Wolfgang Domcke
- Department of Chemistry, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany
| |
Collapse
|
11
|
Tawfik SA, Cui XY, Ringer SP, Stampfl C. TDDFT Study of the Optical Excitation of Nucleic Acid Bases-C 60 Complexes. J Phys Chem A 2017; 121:9058-9063. [PMID: 29111726 DOI: 10.1021/acs.jpca.7b07442] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The potential of C60 as a nucleic acid base (NAB) optical sensor is theoretically explored. We investigate the adsorption of four NABs, namely, adenine, cytosine, guanine, and thymine, on C60 in the gas phase. For the optimal NAB@C60 adsorption configurations, obtained using a dispersion-corrected density functional, we calculate the vis-near-ultraviolet optical response using time-dependent density functional theory. While the isolated C60 and NAB molecules do not exhibit visible optical excitation, we find that C60/NAB conjugation gives rise to distinct spectral features in the visible range. These results suggest that C60 conjugation can be applied for photodetection of individual NABs.
Collapse
Affiliation(s)
| | | | | | - C Stampfl
- School of Physics, The University of Sydney , Sydney, New South Wales 2006, Australia
| |
Collapse
|
12
|
Thicoipe S, Carbonniere P, Pouchan C. DFT modelling of the infrared spectra for isolated and aqueous forms of adenine. Theor Chem Acc 2017. [DOI: 10.1007/s00214-017-2076-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
13
|
Wu X, Karsili TNV, Domcke W. Role of Electron-Driven Proton-Transfer Processes in the Ultrafast Deactivation of Photoexcited Anionic 8-oxoGuanine-Adenine and 8-oxoGuanine-Cytosine Base Pairs. Molecules 2017; 22:molecules22010135. [PMID: 28098833 PMCID: PMC6155867 DOI: 10.3390/molecules22010135] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 12/28/2016] [Accepted: 01/10/2017] [Indexed: 11/16/2022] Open
Abstract
It has been reported that 8-oxo-7,8-dihydro-guanosine (8-oxo-G), which is the main product of oxidative damage of DNA, can repair cyclobutane pyrimidine dimer (CPD) lesions when incorporated into DNA or RNA strands in proximity to such lesions. It has therefore been suggested that the 8-oxo-G nucleoside may have been a primordial precursor of present-day flavins in DNA or RNA repair. Because the electron transfer leading to the splitting of a thymine-thymine pair in a CPD lesion occurs in the photoexcited state, a reasonably long excited-state lifetime of 8-oxo-G is required. The neutral (protonated) form of 8-oxo-G exhibits a very short (sub-picosecond) intrinsic excited-state lifetime which is unfavorable for repair. It has therefore been argued that the anionic (deprotonated) form of 8-oxo-G, which exhibits a much longer excited-state lifetime, is more likely to be a suitable cofactor for DNA repair. Herein, we have investigated the exited-state quenching mechanisms in the hydrogen-bonded complexes of deprotonated 8-oxo-G- with adenine (A) and cytosine (C) using ab initio wave-function-based electronic-structure calculations. The calculated reaction paths and potential-energy profiles reveal the existence of barrierless electron-driven inter-base proton-transfer reactions which lead to low-lying S₁/S₀ conical intersections. The latter can promote ultrafast excited-state deactivation of the anionic base pairs. While the isolated deprotonated 8-oxo-G- nucleoside may have been an efficient primordial repair cofactor, the excited states of the 8-oxo-G--A and 8-oxo-G--C base pairs are likely too short-lived to be efficient electron-transfer repair agents.
Collapse
Affiliation(s)
- Xiuxiu Wu
- Department of Chemistry, Technische Universitat Munchen, Lichtenbergstr. 4, Garching D-85747, Germany.
| | - Tolga N V Karsili
- Department of Chemistry, Temple University, 130 Beury Hall, 1901 N. 13th St., Philadelphia, PA 19122, USA.
| | - Wolfgang Domcke
- Department of Chemistry, Technische Universitat Munchen, Lichtenbergstr. 4, Garching D-85747, Germany.
| |
Collapse
|
14
|
Sushrutha SR, Hota R, Natarajan S. Adenine‐Based Coordination Polymers: Synthesis, Structure, and Properties. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600111] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- S. R. Sushrutha
- Solid State and Structural Chemistry UnitIndian Institute of ScienceBangaloreIndia
| | - Raghunandan Hota
- Solid State and Structural Chemistry UnitIndian Institute of ScienceBangaloreIndia
| | - Srinivasan Natarajan
- Solid State and Structural Chemistry UnitIndian Institute of ScienceBangaloreIndia
| |
Collapse
|
15
|
Jeong HJ, Kim JJ, Kang H. Laser Desorption of Tryptophan from Tryptophan-HCl Salt on a Graphite Substrate. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.10678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hae Jun Jeong
- Department of Chemistry; Ajou University; Suwon 16499 Korea
| | - Jeong Jin Kim
- Department of Chemistry; Ajou University; Suwon 16499 Korea
| | - Hyuk Kang
- Department of Chemistry; Ajou University; Suwon 16499 Korea
| |
Collapse
|
16
|
Improta R, Santoro F, Blancafort L. Quantum Mechanical Studies on the Photophysics and the Photochemistry of Nucleic Acids and Nucleobases. Chem Rev 2016; 116:3540-93. [PMID: 26928320 DOI: 10.1021/acs.chemrev.5b00444] [Citation(s) in RCA: 341] [Impact Index Per Article: 42.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The photophysics and photochemistry of DNA is of great importance due to the potential damage of the genetic code by UV light. Quantum mechanical studies have played a key role in interpretating the results of modern time-resolved pump-probe spectroscopy, and in elucidating the main photoactivated reactive paths. This review provides a concise, complete picture of the computational studies carried out, approximately, in the past decade. We start with an overview of the photophysics of the nucleobases in the gas phase and in solution. We discuss the proposed mechanisms for ultrafast decay to the ground state, that involve conical intersections, consider the role of triplet states, and analyze how the solvent modulates the photophysics. Then we move to larger systems, from dinucleotides to single- and double-stranded oligonucleotides. We focus on the possible role of charge transfer and delocalized or excitonic states in the photophysics of these systems and discuss the main photochemical paths. We finish with an outlook on the current challenges in the field and future directions of research.
Collapse
Affiliation(s)
- Roberto Improta
- Istituto di Biostrutture Biommagini (IBB-CNR), CNR-Consiglio Nazionale delle Ricerche , Via Mezzocannone 16, I-80134, Napoli, Italy
| | - Fabrizio Santoro
- Area della Ricerca di Pisa, Istituto di Chimica dei Composti Organo Metallici (ICCOM-CNR), CNR-Consiglio Nazionale delle Ricerche , Via G. Moruzzi 1, I-56124 Pisa, Italy
| | - Lluís Blancafort
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, Campus de Montilivi , 17071 Girona, Spain
| |
Collapse
|
17
|
Abstract
IR spectroscopy of nucleobases in the gas phase reflects simultaneous advances in both experimental and computational techniques. Important properties, such as excited state dynamics, depend in subtle ways on structure variations, which can be followed by their infrared signatures. Isomer specific spectroscopy is a particularly powerful tool for studying the effects of nucleobase tautomeric form and base pair hydrogen-bonding patterns.
Collapse
Affiliation(s)
- Mattanjah S de Vries
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA,
| |
Collapse
|
18
|
Changenet-Barret P, Hua Y, Markovitsi D. Electronic excitations in Guanine quadruplexes. Top Curr Chem (Cham) 2015; 356:183-201. [PMID: 24563011 DOI: 10.1007/128_2013_511] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Guanine rich DNA strands, such as those encountered at the extremities of human chromosomes, have the ability to form four-stranded structures (G-quadruplexes) whose building blocks are guanine tetrads. G-quadruplex structures are intensively studied in respect of their biological role, as targets for anticancer therapy and, more recently, of their potential applications in the field of molecular electronics. Here we focus on their electronic excited states which are compared to those of non-interacting mono-nucleotides and those of single and double stranded structures. Particular emphasis is given to excited state relaxation processes studied by time-resolved fluorescence spectroscopy from femtosecond to nanosecond time scales. They include ultrafast energy transfer and trapping of ππ* excitations by charge transfer states. The effect of various structural parameters, such as the nature of the metal cations located in the central cavity of G-quadruplexes, the number of tetrads or the conformation of the constitutive single strands, are examined.
Collapse
|
19
|
Poully JC, Miles J, De Camillis S, Cassimi A, Greenwood JB. Proton irradiation of DNA nucleosides in the gas phase. Phys Chem Chem Phys 2015; 17:7172-80. [DOI: 10.1039/c4cp05303f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Charge localization within nucleosides after proton irradiation is strongly influenced by the ionization energy of the base.
Collapse
Affiliation(s)
| | - Jordan Miles
- Centre for Plasma Physics
- School of Mathematics and Physics
- Queen's University Belfast
- Northern Ireland
- UK
| | - Simone De Camillis
- Centre for Plasma Physics
- School of Mathematics and Physics
- Queen's University Belfast
- Northern Ireland
- UK
| | - Amine Cassimi
- CIMAP (UMR 6252 CEA, Université de Caen, ENSICAEN, CNRS)
- 14070 CAEN Cedex 5
- France
| | - Jason B. Greenwood
- Centre for Plasma Physics
- School of Mathematics and Physics
- Queen's University Belfast
- Northern Ireland
- UK
| |
Collapse
|
20
|
Conti I, Nenov A, Höfinger S, Flavio Altavilla S, Rivalta I, Dumont E, Orlandi G, Garavelli M. Excited state evolution of DNA stacked adenines resolved at the CASPT2//CASSCF/Amber level: from the bright to the excimer state and back. Phys Chem Chem Phys 2015; 17:7291-302. [DOI: 10.1039/c4cp05546b] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
La and excimer state population exchange, along the common puckering decay coordinate, explains the longest DNA lifetime component.
Collapse
Affiliation(s)
- Irene Conti
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- Bologna, Italy
| | - Artur Nenov
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- Bologna, Italy
| | - Siegfried Höfinger
- Zentraler Informatikdienst
- Technische Universität Wien
- 1040 Wien, Austria
- Department of Physics
- Michigan Technological University
| | | | - Ivan Rivalta
- Université de Lyon
- CNRS
- Institut de Chimie de Lyon
- École Normale Supérieure de Lyon
- F-69364 Lyon Cedex 07, France
| | - Elise Dumont
- Laboratoire de Chimie
- Ecole Normale Supérieure de Lyon
- Lyon, France
| | - Giorgio Orlandi
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- Bologna, Italy
| | - Marco Garavelli
- Dipartimento di Chimica “G. Ciamician”
- Università di Bologna
- Bologna, Italy
- Laboratoire de Chimie
- Ecole Normale Supérieure de Lyon
| |
Collapse
|
21
|
Raczyńska ED, Makowski M, Hallmann M, Kamińska B. Geometric and energetic consequences of prototropy for adenine and its structural models – a review. RSC Adv 2015. [DOI: 10.1039/c4ra17280a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Prototropy for adenine and its convenient models causes parallel changes of geometric (HOMED) and energetic (ΔE) parameters for neutral tautomers.
Collapse
Affiliation(s)
- Ewa D. Raczyńska
- Department of Chemistry
- Warsaw University of Life Sciences (SGGW)
- 02-776 Warszawa
- Poland
| | | | - Małgorzata Hallmann
- Department of Chemistry
- Warsaw University of Life Sciences (SGGW)
- 02-776 Warszawa
- Poland
| | - Beata Kamińska
- Department of Chemistry
- Warsaw University of Life Sciences (SGGW)
- 02-776 Warszawa
- Poland
| |
Collapse
|
22
|
Kang H, Féraud G, Dedonder-Lardeux C, Jouvet C. New Method for Double-Resonance Spectroscopy in a Cold Quadrupole Ion Trap and Its Application to UV-UV Hole-Burning Spectroscopy of Protonated Adenine Dimer. J Phys Chem Lett 2014; 5:2760-2764. [PMID: 26277976 DOI: 10.1021/jz5012466] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A novel method for double-resonance spectroscopy in a cold quadrupole ion trap is presented, which utilizes dipolar resonant excitation of fragment ions in the quadrupole ion trap. Photofragments by a burn laser are removed by applying an auxiliary RF to the trap, and a probe laser detects the depletion of photofragments by the burn laser. By scanning the wavelength of the burn laser, conformation-specific UV spectrum of a cold ion is obtained. This simple and powerful method is applicable to any type of double-resonance spectroscopy in a cold quadrupole ion trap and was applied to UV-UV hole-burning spectroscopy of protonated adenine dimer. It was found that protonated adenine dimer has multiple conformers/tautomers, each with multiple excited states with drastically different excited state dynamics.
Collapse
Affiliation(s)
- Hyuk Kang
- †Department of Chemistry, Ajou University, San5, Wonchon-dong, Youngtong-gu, Suwon 443-749, Korea
| | - Géraldine Féraud
- ‡CNRS, Aix-Marseille Université, Physique des Interactions Ioniques et Moléculaire (PIIM) UMR 7345, 13397 Marseille Cedex, France
| | - Claude Dedonder-Lardeux
- ‡CNRS, Aix-Marseille Université, Physique des Interactions Ioniques et Moléculaire (PIIM) UMR 7345, 13397 Marseille Cedex, France
| | - Christophe Jouvet
- ‡CNRS, Aix-Marseille Université, Physique des Interactions Ioniques et Moléculaire (PIIM) UMR 7345, 13397 Marseille Cedex, France
| |
Collapse
|
23
|
Benda Z, Szalay PG. Details of the Excited-State Potential Energy Surfaces of Adenine by Coupled Cluster Techniques. J Phys Chem A 2014; 118:6197-207. [DOI: 10.1021/jp505331s] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Zsuzsanna Benda
- Laboratory of Theoretical Chemistry, Institute of Chemistry, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
| | - Péter G. Szalay
- Laboratory of Theoretical Chemistry, Institute of Chemistry, Eötvös University, P.O. Box 32, H-1518 Budapest, Hungary
| |
Collapse
|
24
|
Raczyńska ED, Makowski M. Geometric consequences of electron delocalization for adenine tautomers in aqueous solution. J Mol Model 2014; 20:2234. [PMID: 24842324 PMCID: PMC4072068 DOI: 10.1007/s00894-014-2234-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 04/03/2014] [Indexed: 11/26/2022]
Abstract
Geometric consequences of electron delocalization were studied for all possible adenine tautomers in aqueous solution by means of ab initio methods {PCM(water)//DFT(B3LYP)/6-311+G(d,p)} and compared to those in the gas phase {DFT(B3LYP)/6-311+G(d,p)}. To measure the consequences of any type of resonance conjugation (π-π, n-π, and σ-π), the geometry-based harmonic oscillator model of electron delocalization (HOMED) index, recently extended to the isolated (DFT) and hydrated (PCM//DFT) molecules, was applied to the molecular fragments (imidazole, pyrimidine, 4-aminopyrimidine, and purine) and also to the whole tautomeric system. For individual tautomers, the resonance conjugations and consequently the bond lengths strongly depend on the position of the labile protons. The HOMED indices are larger for tautomers (or their fragments) possessing the labile proton(s) at the N rather than C atom. Solvent interactions with adenine tautomers slightly increase the resonance conjugations. Consequently, they slightly shorten the single bonds and lengthen the double bonds. When going from the gas phase to water solution, the HOMED indices increase (by less than 0.15 units). There is a good relation between the HOMED indices estimated in water solution and those in the gas phase for the neutral and ionized forms of adenine. Subtle effects, being a consequence of intramolecular interactions between the neighboring groups, are so strongly reduced by solvent that the relation between the HOMED indices and the relative energies for the neutral adenine tautomers seems to be better in water solution than in the gas phase.
Collapse
Affiliation(s)
- Ewa D Raczyńska
- Department of Chemistry, Warsaw University of Life Sciences (SGGW), ul. Nowoursynowska 159c, 02-776, Warszawa, Poland,
| | | |
Collapse
|
25
|
Burova TG, Nurlygaianova MN, Ten GN. Investigation of tautomeric composition of cytosine by multiphoton excitation spectra. II. Two-photon absorption spectra. Biophysics (Nagoya-shi) 2014. [DOI: 10.1134/s0006350914020055] [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] Open
|
26
|
Berdakin M, Féraud G, Dedonder-Lardeux C, Jouvet C, Pino GA. Excited states of protonated DNA/RNA bases. Phys Chem Chem Phys 2014; 16:10643-50. [DOI: 10.1039/c4cp00742e] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The excited state lifetime of protonated DNA/RNA bases is strongly dependent on the tautomeric form.
Collapse
Affiliation(s)
- Matias Berdakin
- INFIQC (CONICET – Universidad Nacional de Córdoba) Dpto. de Fisicoquímica – Facultad de Ciencias Químicas – Centro Láser de Ciencias Moleculares – Universidad Nacional de Córdoba
- Ciudad Universitaria
- X5000HUA Córdoba, Argentina
| | - Géraldine Féraud
- CNRS
- Aix Marseille Université
- Physique des Interactions Ioniques et Moléculaires (PIIM): UMR-7345
- 13397 Marseille, France
| | - Claude Dedonder-Lardeux
- CNRS
- Aix Marseille Université
- Physique des Interactions Ioniques et Moléculaires (PIIM): UMR-7345
- 13397 Marseille, France
| | - Christophe Jouvet
- CNRS
- Aix Marseille Université
- Physique des Interactions Ioniques et Moléculaires (PIIM): UMR-7345
- 13397 Marseille, France
| | - Gustavo A. Pino
- INFIQC (CONICET – Universidad Nacional de Córdoba) Dpto. de Fisicoquímica – Facultad de Ciencias Químicas – Centro Láser de Ciencias Moleculares – Universidad Nacional de Córdoba
- Ciudad Universitaria
- X5000HUA Córdoba, Argentina
| |
Collapse
|
27
|
Ovchinnikov VA, Sundholm D. Coupled-cluster and density functional theory studies of the electronic 0–0 transitions of the DNA bases. Phys Chem Chem Phys 2014; 16:6931-41. [DOI: 10.1039/c3cp55080j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 0–0 transitions of the electronic excitation spectra of the lowest tautomers of the four nucleotide (DNA) bases have been studied using linear-response approximate coupled-cluster singles and doubles (CC2) calculations.
Collapse
Affiliation(s)
- Vasily A. Ovchinnikov
- University of Helsinki
- 00014 Helsinki, Finland
- Emanuel Institute of Biochemical Physics RAS
- 119334 Moscow, Russia
| | | |
Collapse
|
28
|
|
29
|
Miyazaki M, Kang H, Choi CM, Han NS, Song JK, Kim NJ, Fujii M. MODE-specific deactivation of adenine at the singlet excited states. J Chem Phys 2013; 139:124311. [DOI: 10.1063/1.4821830] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
30
|
Alrawashdeh AI, Almatarneh MH, Poirier RA. Computational study on the deamination reaction of adenine with OH−/nH2O (n = 0, 1, 2, 3) and 3H2O. CAN J CHEM 2013. [DOI: 10.1139/cjc-2012-0416] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Deamination of adenine is one of several forms of premutagenic lesions occurring in DNA. In the present study, mechanisms for the deamination reaction of adenine with OH−/nH2O (n = 0, 1, 2, 3) and 3H2O were investigated. HF/6-31G(d), B3LYP/6-31G(d), MP2/6-31G(d), and B3LYP/6-31+G(d) levels of theory were employed to search for and optimize all geometries. Energies were calculated at the G3MP2B3 and CBS-QB3 levels of theory. The effect of solvent (water) was computed using the polarizable continuum model (PCM). Intrinsic reaction coordinate (IRC) calculations were performed for all transition states. Five pathways were investigated for the deamination reaction of adenine with OH−/nH2O and 3H2O. The first four pathways (A–D) are initiated by deprotonation at the amino group of adenine by OH−, while pathway E is initiated by tautomerization of adenine. For all pathways the next two steps involve formation of a tetrahedral intermediate followed by dissociation to products via a 1,3-proton shift. Deamination with a single OH− has a high activation barrier (190 kJ mol−1 using the G3MP2B3 level) for the rate-determining step. The addition of one water molecule reduces this barrier by 68 kJ mol−1 at the G3MP2B3 level. Adding additional water molecules decreases the overall activation energy of the reaction, but the effect becomes smaller with each additional water molecule. The most plausible mechanism is pathway E, the deamination reaction of adenine with 3H2O, with an overall G3MP2B3 activation energy of 139 and 137 kJ mol−1 for the gas phase and PCM, respectively. This barrier is lower than that for the deamination with OH−/3H2O by 6 and 2 kJ mol−1 for the gas phase and PCM, respectively.
Collapse
Affiliation(s)
| | | | - Raymond A. Poirier
- Chemistry Department, Memorial University, St. John's, NL A1B 3X7, Canada
| |
Collapse
|
31
|
|
32
|
Raczyńska ED, Makowski M, Zientara-Rytter K, Kolczyńska K, Stępniewski TM, Hallmann M. Quantum-Chemical Studies on the Favored and Rare Tautomers of Neutral and Redox Adenine. J Phys Chem A 2013; 117:1548-59. [DOI: 10.1021/jp3081029] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ewa D. Raczyńska
- Department of Chemistry, Warsaw University of Life Sciences (SGGW), ul. Nowoursynowska
159 c, 02-776 Warszawa, Poland
| | - Mariusz Makowski
- Faculty of Chemistry, Univeristy of Gdańsk, ul. Sobieskiego 18, 80-952
Gdańsk, Poland
| | - Katarzyna Zientara-Rytter
- Interdisciplinary
Department of
Biotechnology, Warsaw University of Life Sciences (SGGW), ul. Nowoursynowska 166, 02-776 Warszawa, Poland
| | - Katarzyna Kolczyńska
- Interdisciplinary
Department of
Biotechnology, Warsaw University of Life Sciences (SGGW), ul. Nowoursynowska 166, 02-776 Warszawa, Poland
| | - Tomasz M. Stępniewski
- Interdisciplinary
Department of
Biotechnology, Warsaw University of Life Sciences (SGGW), ul. Nowoursynowska 166, 02-776 Warszawa, Poland
| | - Małgorzata Hallmann
- Department of Chemistry, Warsaw University of Life Sciences (SGGW), ul. Nowoursynowska
159 c, 02-776 Warszawa, Poland
| |
Collapse
|
33
|
Gustavsson T, Sarkar N, Vayá I, Jiménez MC, Markovitsi D, Improta R. A joint experimental/theoretical study of the ultrafast excited state deactivation of deoxyadenosine and 9-methyladenine in water and acetonitrile. Photochem Photobiol Sci 2013; 12:1375-86. [DOI: 10.1039/c3pp50060h] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
34
|
First observation of infrared and UV–visible absorption spectra of adenine radical in low-temperature argon matrices. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.03.070] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
35
|
Beames JM, Vaden TD, Hudson AJ. The spectroscopy of jet-cooled porphyrins: an insight into the vibronic structure of the Q band. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424610002094] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We will present resonant two-photon ionization spectra for meso-tetraphenylporphyrin, H 2 TPP , measured under isolated conditions. The polycrystalline compound was vaporized, in vacuo, using both thermal and laser desorption, and seeded into a supersonic expansion of an inert-carrier gas. The molecules remain largely intact in the gaseous phase. However, the two techniques for vaporizing H 2 TPP give different internal temperatures for the isolated substrate, with greater vibrational cooling achieved using laser desorption. A comparison of the peak positions and intensities in the resonant two-photon ionization spectra of thermal- and laser-desorbed molecules provides an insight into the vibrational structure of the Q band. In particular, the greater contribution made by electronic transitions originating from higher vibrational levels in the ground state of H 2 TPP is emphasized. We conclude that vibronic coupling in the ground electronic state plays an important role in a quantum-mechanical interpretation of the Q band.
Collapse
Affiliation(s)
- Joseph M. Beames
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Timothy D. Vaden
- Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - Andrew J. Hudson
- Department of Chemistry, University of Leicester, Leicester LE1 7RH, United Kingdom
| |
Collapse
|
36
|
Li JH, Chai JD, Guo GY, Hayashi M. Significant role of the DNA backbone in mediating the transition origin of electronic excitations of B-DNA – implication from long range corrected TDDFT and quantified NTO analysis. Phys Chem Chem Phys 2012; 14:9092-103. [DOI: 10.1039/c2cp23676a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
37
|
Lan Z, Lu Y, Fabiano E, Thiel W. QM/MM Nonadiabatic Decay Dynamics of 9H-Adenine in Aqueous Solution. Chemphyschem 2011; 12:1989-98. [DOI: 10.1002/cphc.201001054] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Revised: 04/08/2011] [Indexed: 11/09/2022]
|
38
|
van Zundert GCP, Jaeqx S, Berden G, Bakker JM, Kleinermanns K, Oomens J, Rijs AM. IR Spectroscopy of Isolated Neutral and Protonated Adenine and 9-Methyladenine. Chemphyschem 2011; 12:1921-7. [DOI: 10.1002/cphc.201100133] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Indexed: 11/11/2022]
|
39
|
Lobsiger S, Sinha RK, Trachsel M, Leutwyler S. Low-lying excited states and nonradiative processes of the adenine analogues 7H- and 9H-2-aminopurine. J Chem Phys 2011; 134:114307. [DOI: 10.1063/1.3567090] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
40
|
Evans NL, Ullrich S. Wavelength dependence of electronic relaxation in isolated adenine using UV femtosecond time-resolved photoelectron spectroscopy. J Phys Chem A 2011; 114:11225-30. [PMID: 20961159 DOI: 10.1021/jp1029097] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electronic relaxation pathways in photoexcited nucleobases have received much theoretical and experimental attention due to their underlying importance to the UV photostability of these biomolecules. Multiple mechanisms with different energetic onsets have been proposed by ab initio calculations yet the majority of experiments to date have only probed the photophysics at a few selected excitation energies. We present femtosecond time-resolved photoelectron spectra (TRPES) of the DNA base adenine in a molecular beam at multiple excitation energies between 4.7-6.2 eV. The two-dimensional TRPES data is fit globally to extract lifetimes and decay associated spectra for unambiguous identification of states participating in the relaxation. Furthermore, the corresponding amplitude ratios are indicative of the relative importance of competing pathways. We adopt the following mechanism for the electronic relaxation of isolated adenine; initially the S(2)(ππ*) state is populated by all excitation wavelengths and decays quickly within 100 fs. For excitation energies below ∼5.2 eV, the S(2)(ππ*)→S(1)(nπ*)→S(0) pathway dominates the deactivation process. The S(1)(nπ*)→S(0) lifetime (1032-700 fs) displays a trend toward shorter time constants with increasing excitation energy. On the basis of relative amplitude ratios, an additional relaxation channel is identified at excitation energies above 5.2 eV.
Collapse
Affiliation(s)
- Nicholas L Evans
- Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA
| | | |
Collapse
|
41
|
Catalán J, Catalán JP. On the solvatochromism of the n ↔π* electronic transitions in ketones. Phys Chem Chem Phys 2011; 13:4072-82. [DOI: 10.1039/c0cp02282a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
42
|
Kang H, Chang J, Lee SH, Ahn TK, Kim NJ, Kim SK. Excited-state lifetime of adenine near the first electronic band origin. J Chem Phys 2010; 133:154311. [DOI: 10.1063/1.3505001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
|
43
|
Aravind G, Antoine R, Klaerke B, Lemoine J, Racaud A, Rahbek DB, Rajput J, Dugourd P, Andersen LH. Sub-microsecond photodissociation pathways of gas phase adenosine 5'-monophosphate nucleotide ions. Phys Chem Chem Phys 2010; 12:3486-90. [PMID: 20355289 DOI: 10.1039/b921038e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The sub-microsecond dissociation pathways for the protonated and deprotonated forms of adenosine 5'-monophosphate were probed in the gas phase using a linear time of flight spectrometer. The studies show two dissociation pathways for the AMP ions indicating dominant ergodic pathways in the photodissociation of these species. The photofragmentation was determined to be a single photon process for the AMP ions. Photodetachment of the AMP anion excited at 266 nm was not observed, leaving dissociation as the prominent pathway for relaxation of the excess energy in the biomolecule. The photofragments were analysed at the electrostatic ion storage ring (ELISA) and found to be similar to collision induced fragments in the case of anions but different in the case of cations.
Collapse
Affiliation(s)
- G Aravind
- Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
| | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Schwalb NK, Temps F. A modified four-state model for the "dual fluorescence" of N(6),N(6)-dimethyladenine derived from femtosecond fluorescence spectroscopy. J Phys Chem A 2010; 113:13113-23. [PMID: 19569655 DOI: 10.1021/jp9021773] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The radiationless deactivation of the excited electronic states of the dual fluorescence molecule N(6),N(6)-dimethyladenine (DMAde) was investigated using femtosecond time-resolved fluorescence up-conversion spectroscopy. The molecules were studied in solution in water and in dioxane. Fluorescence-time profiles were recorded in the wide wavelength range of 290 <or= lambda(fl) <or= 650 nm. The excitation wavelengths in the region of the first UV absorption band were tuned from close to the electronic origin (lambda(pump) = 294 nm) to excess energies of approximately 5400 cm(-1) above (lambda(pump) = 258 nm). Global fits to the measured curves turned out to reflect distinctive molecular relaxation processes on five well-defined time scales. Sub-100 fs and 0.52(3) ps lifetimes were found to predominate at the shortest UV and blue emission wavelengths in water, 1.5(1) and 3.0(2) ps components at intermediate wavelengths and a 62(1) ps value in the red region of the spectrum (2sigma error limits of the last digits in parentheses). In dioxane, these lifetimes changed to <or=0.27 and 0.63(4) ps in the UV, 1.5(1) and 10.9(10) ps in a wide range of intermediate, and 1.40(4) ns at the longest wavelengths. However, little dependence of the respective time constants on lambda(pump) was observed, indicating that the ensuing relaxation processes proceed via practically barrierless pathways through conical intersections. Building on the knowledge for the parent molecule adenine (Ade), the observations were rationalized with the help of a modified four-state model for the electronic dynamics in DMAde with the pipi*(L(a)), pipi*(L(b)), and npi* states similar to those in Ade and an intramolecular charge-transfer (ICT) state, which has no counterpart in Ade, responsible for the long-wavelength fluorescence.
Collapse
Affiliation(s)
- Nina K Schwalb
- Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, Olshausenstrasse 40, D-24098 Kiel, Germany.
| | | |
Collapse
|
45
|
Conti I, Altoè P, Stenta M, Garavelli M, Orlandi G. Adenine deactivation in DNA resolved at the CASPT2//CASSCF/AMBER level. Phys Chem Chem Phys 2010; 12:5016-23. [DOI: 10.1039/b926608a] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
46
|
Smolarek S, Rijs AM, Buma WJ, Drabbels M. Absorption spectroscopy of adenine, 9-methyladenine, and 2-aminopurine in helium nanodroplets. Phys Chem Chem Phys 2010; 12:15600-6. [DOI: 10.1039/c0cp00746c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
47
|
Aidas K, Mikkelsen KV, Kongsted J. On the existence of the H3 tautomer of adenine in aqueous solution. Rationalizations based on hybrid quantum mechanics/molecular mechanics predictions. Phys Chem Chem Phys 2010; 12:761-8. [DOI: 10.1039/b915604f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
48
|
Nosenko Y, Kunitski M, Riehn C, Harbach PHP, Dreuw A, Brutschy B. The structure of adenine monohydrates studied by femtosecond multiphoton ionization detected IR spectroscopy and quantum chemical calculations. Phys Chem Chem Phys 2010; 12:863-70. [DOI: 10.1039/b914236c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
|
49
|
Conti I, Garavelli M, Orlandi G. Deciphering Low Energy Deactivation Channels in Adenine. J Am Chem Soc 2009; 131:16108-18. [DOI: 10.1021/ja902311y] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Irene Conti
- Dipartimento di Chimica ‘G. Ciamician’, Universita’ di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Marco Garavelli
- Dipartimento di Chimica ‘G. Ciamician’, Universita’ di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Giorgio Orlandi
- Dipartimento di Chimica ‘G. Ciamician’, Universita’ di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| |
Collapse
|
50
|
Conti I, Di Donato E, Negri F, Orlandi G. Revealing Excited State Interactions by Quantum-Chemical Modeling of Vibronic Activities: The R2PI Spectrum of Adenine. J Phys Chem A 2009; 113:15265-75. [DOI: 10.1021/jp905795n] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Irene Conti
- Dipartimento di Chimica “G. Ciamician”, Universitá di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Eugenio Di Donato
- Dipartimento di Chimica “G. Ciamician”, Universitá di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Fabrizia Negri
- Dipartimento di Chimica “G. Ciamician”, Universitá di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| | - Giorgio Orlandi
- Dipartimento di Chimica “G. Ciamician”, Universitá di Bologna, Via F. Selmi, 2, 40126 Bologna, Italy, and INSTM, UdR Bologna, Italy
| |
Collapse
|