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Onchoke KK, Chaudhry SN, Ojeda JJ. Vibrational and electronic spectra of 2-nitrobenzanthrone: An experimental and computational study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 153:402-414. [PMID: 26348130 DOI: 10.1016/j.saa.2015.08.053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 08/18/2015] [Accepted: 08/30/2015] [Indexed: 06/05/2023]
Abstract
The environmental pollutant 2-nitrobenzanthrone (2-NBA) poses human health hazards, and is formed by atmospheric reactions of NOX gases with atmospheric particulates. Though its mutagenic effects have been studied in biological systems, its comprehensive spectroscopic experimental data are scarce. Thus, vibrational and optical spectroscopic analysis (UV-Vis, and fluorescence) of 2-NBA was studied using both experimental and density functional theory employing B3LYP method with 6-311+G(d,p) basis set. The scaled theoretical vibrational frequencies show good agreement to experiment to within ~5 cm(-1) and <20 cm(-1) for frequencies <1800 cm(-1) and 2700-3200 cm(-1), respectively. In addition, predictions of the DFT frequencies below 1800 cm(-1) yield an overall root mean square (RMS) of ±20.1 and ±20.6 cm(-1) for benzanthrone and 2-NBA, respectively. On the basis of normal coordinate analysis complete assignments of harmonic experimental infrared and Raman bands are made. The influence of the nitro group substitution upon the benzanthrone structure and symmetric CH vibrations, and electronic spectra is noted. This study is useful for the development of spectroscopy-mutagenicity relationships in nitrated polycyclic aromatic hydrocarbons.
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Affiliation(s)
- Kefa K Onchoke
- Department of Chemistry & Biochemistry, Stephen F. Austin State University, Box 13006 - SFA Station, Nacogdoches, TX, 75962-3006, United States.
| | - Saad N Chaudhry
- Department of Chemistry & Biochemistry, Stephen F. Austin State University, Box 13006 - SFA Station, Nacogdoches, TX, 75962-3006, United States
| | - Jorge J Ojeda
- Department of Chemistry & Biochemistry, Stephen F. Austin State University, Box 13006 - SFA Station, Nacogdoches, TX, 75962-3006, United States
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Onchoke KK, Ojeda JJ. A DFT Study of Vibrational Spectra and Mutagenicity Predictions of Mononitrated Fluoranthenes. Polycycl Aromat Compd 2013. [DOI: 10.1080/10406638.2013.810654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Li XH, Gong XY, Zhang XZ. Molecular structure and vibrational spectra of Benzophenone hydrazone molecule by density functional theory. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.08.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Onchoke KK, Dutta PK, Parks ME, Martinez MN. Vibrational and electronic spectra of 9,10-dihydrobenzo(a)pyren-7(8H)-one and 7,8,9,10-tetrahydrobenzo(a)pyrene: an experimental and computational study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 81:162-171. [PMID: 21737341 DOI: 10.1016/j.saa.2011.05.091] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Revised: 05/18/2011] [Accepted: 05/25/2011] [Indexed: 05/31/2023]
Abstract
The molecular geometries, vibrational and UV-vis spectra of 9,10-dihydrobenzo(a)pyrene-7(8H)-one (9,10-H(2)BaP) and 7,8,9,10-tetrahydrobenzo(a)pyrene (7,8,9,10-H(4)BaP) were investigated using density functional theory (DFT-B3LYP), with the triple-ζ 6-311+G(d,p) and Dunning's cc-pVTZ basis sets. From the comparison of infrared experimental and calculated infrared, and Raman data comprehensive assignments are made. The calculated infrared frequencies below 1800 cm(-1) are in good agreement with experimental data, with an average deviation of <4 cm(-1). Using the B3LYP/6-311+G(d,p)//TD-B3LYP/6-311G(d,p) level of theory, transition energies, and oscillator strengths of the 30 lowest electronic absorption bands are assigned to π-π* transitions, with good qualitative agreement between experimental and simulated absorption data. In addition, the HOMO-LUMO gaps and their chemical hardness were analyzed.
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Affiliation(s)
- Kefa K Onchoke
- Department of Chemistry, Stephen F. Austin State University, Box 3006-SFA Station, Nacogdoches, TX 75962-3006, USA.
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Yatsuhashi T, Nakashima N. Formation and Fragmentation of Quadruply Charged Molecular Ions by Intense Femtosecond Laser Pulses. J Phys Chem A 2010; 114:7445-52. [DOI: 10.1021/jp103725s] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tomoyuki Yatsuhashi
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585 Japan, and PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama, 332-0012 Japan
| | - Nobuaki Nakashima
- Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585 Japan, and PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama, 332-0012 Japan
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Onchoke KK, Parks ME, Nolan AH. A DFT study of the vibrational spectra of 1-, and 2-nitrotriphenylene. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 74:579-587. [PMID: 19651536 DOI: 10.1016/j.saa.2009.07.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Revised: 07/04/2009] [Accepted: 07/07/2009] [Indexed: 05/28/2023]
Abstract
The infrared (IR) and Raman spectra, and intensities of triphenylene, 1-, and 2-nitrotriphenylene were investigated by the density functional theory (DFT, B3LYP method) with 6-311 +G** basis set. Normal mode assignments are proposed with particular emphasis on the nitro group vibrations. Compared to 2-nitrotriphenylene (2-NTRP) 1-nitrotriphenylene (1-NTRP) is predicted to show asymmetric nitro stretches at higher frequencies. Through the vibrational study, the structure-spectroscopic relationships of these nitro polycyclic aromatic hydrocarbons (nitro-PAHs) are made, and possible insights into their differential mutagenic potencies correlated. The geometrical distortions of the TRP structure upon nitro group substitution and correlations between structural parameters and vibrational data as well as structure-function relationships related to the mutagenicity of this important class of polycyclic aromatic hydrocarbons are discussed.
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Affiliation(s)
- Kefa K Onchoke
- Department of Chemistry, Stephen F. Austin State University, Nacogdoches, TX 75962-13006, USA.
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Staicu A, Rouillé G, Henning T, Huisken F, Pouladsaz D, Scholz R. S1←S0 transition of 2,3-benzofluorene at low temperatures in the gas phase. J Chem Phys 2008; 129:074302. [DOI: 10.1063/1.2967186] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Electronic spectroscopy of polycyclic aromatic hydrocarbons (PAHs) at low temperature in the gas phase and in helium droplets. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.10.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Onchoke KK, Hadad CM, Dutta PK. Structure and Vibrational Spectra of Mononitrated Benzo[a]pyrenes. J Phys Chem A 2005; 110:76-84. [PMID: 16392842 DOI: 10.1021/jp054881d] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The molecules benzo[a]pyrene (BaP) and 1-, 3-, and 6-nitrobenzo[a]pyrene (1-NBaP, 3-NBaP, 6-NBaP) are currently of significant interest due to their presence in respirable combustion exhaust particulates and their mutagenic and carcinogenic properties. Structure-function correlations as well as spectroscopic signatures for trace analysis are necessary for these benzo[a]pyrene derivatives. In this paper, detailed infrared and Raman spectroscopic data of BaP and its three mononitrated isomers are provided for the first time. By utilizing density functional theory (DFT, B3LYP method with 6-311+G basis set), the molecular geometries and the vibrational spectra are calculated. Good agreement is noted between the calculated and experimental geometry for BaP, and predictions of the vibrational data for all compounds are within approximately 5 cm-1 of the experimental data. Normal mode assignments are proposed with particular emphasis on the nitro group vibrations. The geometrical distortions of the BaP structure upon nitro group substitution and correlations between structural parameters and vibrational data as well as structure-function relationships related to the mutagenicity of this important class of polycyclic aromatic hydrocarbons are discussed.
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Affiliation(s)
- Kefa K Onchoke
- Department of Chemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210, USA
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Wang H, Szczepanski J, Hirata S, Vala M. Vibrational and Electronic Absorption Spectroscopy of Dibenzo[b,def]chrysene and Its Ions. J Phys Chem A 2005; 109:9737-46. [PMID: 16833287 DOI: 10.1021/jp0527960] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The vibrational and electronic absorption spectra of dibenzo[b,def]chrysene (DBC) and its ions in argon matrixes have been recorded. Assignment of the observed infrared (IR) bands has been made by comparison with the density functional theory (DFT) computations of harmonic vibrational frequencies (with 6-31G(d,p) or 6-311+G(d,p) basis sets). Extensive time-dependent (TD) DFT calculations of vertical excitation energies have aided in the assignment of the experimental electronic absorption transitions. In general, the theoretical predictions are in good agreement with the observed ultraviolet and visible bands. By correlating IR and UV-visible band intensities (after UV photolysis), it has been shown that both DBC cations and anions are formed. The IR band intensity distributions of the DBC ions differ markedly from neutral DBC. A synthetic spectrum composed of neutral, cationic, and anionic DBC contributions compares reasonably well with the interstellar features of the "unidentified infrared" (UIR) bands from the reflection nebula NGC 7023. Finally, it is shown that the electronic absorption bands of the DBC ions lie in close proximity to several of the diffuse interstellar visible absorption bands (DIBs).
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Affiliation(s)
- Haiyan Wang
- Department of Chemistry and Center for Chemical Physics, University of Florida, Gainesville, Florida 32611-7200, USA
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Rapacioli M, Calvo F, Spiegelman F, Joblin C, Wales DJ. Stacked Clusters of Polycyclic Aromatic Hydrocarbon Molecules. J Phys Chem A 2005; 109:2487-97. [PMID: 16833550 DOI: 10.1021/jp046745z] [Citation(s) in RCA: 159] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Clusters of polycyclic aromatic hydrocarbon (PAH) molecules are modeled using explicit all-atom potentials using a rigid-body approximation. The considered range of PAHs goes from pyrene (C10H8) to circumcoronene (C54H18) and clusters containing between 2 and 32 molecules are investigated. In addition to the usual repulsion-dispersion interactions, electrostatic point-charge interactions are incorporated, as obtained from density functional theory calculations. The general electrostatic distribution in neutral or singly charged PAHs is reproduced well using a fluctuating-charges analysis, which provides an adequate description of the multipolar distribution. Global optimization is performed using a variety of methods, including basin-hopping and parallel tempering Monte Carlo. We find evidence that stacking the PAH molecules generally yields the most stable motif. A structural transition between one-dimensional stacks and three-dimensional shapes built from multiple stacks is observed at larger sizes, and the threshold for this transition increases with the size of the monomer. Larger aggregates seem to evolve toward the packing observed for benzene in bulk. Difficulties met in optimizing these clusters are analyzed in terms of the strong anisotropy of the molecules. We also discuss segregation in heterogeneous clusters and vibrational properties in the context of astrophysical observations.
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Affiliation(s)
- M Rapacioli
- Centre d'Etude Spatiale des Rayonnements, CNRS-UPS, 9 av. du colonel Roche, BP 4346, 31048 Toulouse Cedex 4, France
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Banisaukas J, Szczepanski J, Eyler J, Vala M. Photodissociation Pathways of the 2,3-Benzofluorene Cation. J Phys Chem A 2004. [DOI: 10.1021/jp040100h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- John Banisaukas
- Department of Chemistry and Center for Chemical Physics, University of Florida, Gainesville, Florida 32611-7200
| | - Jan Szczepanski
- Department of Chemistry and Center for Chemical Physics, University of Florida, Gainesville, Florida 32611-7200
| | - John Eyler
- Department of Chemistry and Center for Chemical Physics, University of Florida, Gainesville, Florida 32611-7200
| | - Martin Vala
- Department of Chemistry and Center for Chemical Physics, University of Florida, Gainesville, Florida 32611-7200
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