1
|
Mamalis D, Panagiotopoulou A, Couladouros EA, Tzeli D, Vidali VP. A DFT Study towards the Amide cis‐trans Isomerization Process of the Myc‐Max Inhibitor Mycro 3 and Its Photophysical Properties; Synthesis and NMR Studies of the trans‐Conformation. ChemistrySelect 2022. [DOI: 10.1002/slct.202201639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Dimitrios Mamalis
- Laboratory of Physical Chemistry Department of Chemistry National and Kapodistrian University of Athens Panepistimiopolis Athens 157 71 Greece
- Institute of Nanoscience and Nanotechnology National Center for Scientific Research “Demokritos” Ag. Paraskevi 153 41 Athens Greece
- Theoretical and Physical Chemistry Institute National Hellenic Research Foundation, 48 Vassileos Constantinou Ave. Athens 116 35 Greece
| | - Angeliki Panagiotopoulou
- Institute of Biosciences and Applications National Center for Scientific Research “Demokritos”, Ag. Paraskevi 153 41 Athens Greece
| | - Elias A. Couladouros
- Agricultural University of Athens Department of Food Science and Human Nutrition Iera Odos 75 Athens 118 55 Greece
| | - Demeter Tzeli
- Laboratory of Physical Chemistry Department of Chemistry National and Kapodistrian University of Athens Panepistimiopolis Athens 157 71 Greece
- Theoretical and Physical Chemistry Institute National Hellenic Research Foundation, 48 Vassileos Constantinou Ave. Athens 116 35 Greece
| | - Veroniki P. Vidali
- Institute of Nanoscience and Nanotechnology National Center for Scientific Research “Demokritos” Ag. Paraskevi 153 41 Athens Greece
| |
Collapse
|
2
|
Stanković B, Ostojić BD, Popović A, Gruden MА, Đorđević DS. Theoretical study of nitrodibenzofurans: A possible relationship between molecular properties and mutagenic activity. JOURNAL OF HAZARDOUS MATERIALS 2016; 318:623-630. [PMID: 27475460 DOI: 10.1016/j.jhazmat.2016.07.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 06/17/2016] [Accepted: 07/14/2016] [Indexed: 06/06/2023]
Abstract
In this study we present a theoretical investigation of the molecular properties of nitrodibenzofurans (NDFs) and dinitrodibenzofurans (DNDFs) and their relation to mutagenic activity. Equilibrium geometries, relative energies, vertical ionization potentials (IP), vertical electron activities (EA), electronic dipole polarizabilities, and dipole moments of all NDFs and three DNDFs calculated by Density Functional Theory (DFT) methods are reported. The Ziegler/Rauk Energy Decomposition Analysis (EDA) is employed for a direct estimate of the variations of the orbital interaction and steric repulsion terms corresponding to the nitro group and the oxygen of the central ring of NDFs. The results indicate differences among NDF isomers for the cleavage of the related bonds and steric effects in the active site. The results show a good linear relationship between polarizability (<α>), anisotropy of polarizability (Δα), the summation of IR intensities (ΣIIR) and the summation of Raman activities (ΣARaman) over all 3N-6 vibrational modes and experimental mutagenic activities of NDF isomers in Salmonella typhimurium TA98 strain. The polarizability changes with respect to the νsNO+CN vibrational mode are in correlation with the mutagenic activities of NDFs and suggest that intermolecular interactions are favoured along this coordinate.
Collapse
Affiliation(s)
- B Stanković
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11 000 Belgrade, Serbia
| | - B D Ostojić
- Institute for Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia.
| | - A Popović
- Faculty of Chemistry, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia
| | - M А Gruden
- Faculty of Chemistry, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia
| | - D S Đorđević
- Institute for Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia
| |
Collapse
|
3
|
Ostojić BD, Đorđević DS. Two nitro derivatives of azabenzo[a]pyrene N-oxide: electronic properties and their relation to mutagenic activity. JOURNAL OF HAZARDOUS MATERIALS 2015; 285:94-102. [PMID: 25497021 DOI: 10.1016/j.jhazmat.2014.11.032] [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: 07/15/2014] [Revised: 10/25/2014] [Accepted: 11/22/2014] [Indexed: 06/04/2023]
Abstract
The equilibrium geometries, relative energies, IR and Raman spectra, vertical ionization potentials (IP), vertical electron affinities (EA), dipole moments (μ), electronic dipole polarizabilities (α), and molecular electrostatic potentials (MEP) of two species that show very high mutagenicity, 1-nitro-6-azabenzo[a]pyrene N-oxide (1-N-6-ABPO) and 3-nitro-6-azabenzo[a]pyrene N-oxide (3-N-6-ABPO), are investigated by means of Density Functional Theory (DFT) using B3LYP functional with different basis sets. The 3-N-6-ABPO isomer was estimated to be much more mutagenic in Salmonella typhimurium tester strain TA98 (396,000 revertants/nmol) than 1-N-6-ABPO (36100 revertants/nmol) (Fukuhara et al., 1992). The results show that for both isomers the structural, energetic, and vibrational properties are similar. The orientation of the nitro group with respect to the plane of the aromatic system as well as the nitroreduction and oxidation reaction and polarizability seem not be important for the determination of different mutagenic behavior of these isomers. However, the dipole moment of 3-N-6-ABPO is about 3 times that of 1-N-6-ABPO. The larger dipole moment and the different electronic charge distribution of 3-N-6-ABPO compared to 1-N-6-ABPO imply stronger electrostatic and inductive molecular interactions so that the active site of the enzyme involved in the mutagenic activation can more effectively bind 3-N-6-ABPO compared to 1-N-6-ABPO.
Collapse
Affiliation(s)
- Bojana D Ostojić
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia.
| | - Dragana S Đorđević
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia
| |
Collapse
|
4
|
Kandasamy M, Velraj G, Kalaichelvan S, Mariappan G. Characterization of 1,5-dimethoxynaphthalene by vibrational spectroscopy (FT-IR and FT-Raman) and density functional theory calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 134:191-199. [PMID: 25014641 DOI: 10.1016/j.saa.2014.06.092] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Revised: 06/09/2014] [Accepted: 06/12/2014] [Indexed: 06/03/2023]
Abstract
In this work, we reported a combined experimental and theoretical study on molecular structure, vibrational spectra and natural bond orbital (NBO) analysis of 1,5-dimethoxynaphthalene. The optimized molecular structure, atomic charges, vibrational frequencies and natural bond orbital analysis of 1,5-dimethoxynaphthalene have been studied by performing DFT/B3LYP/6-31G(d,p) level of theory. The FTIR, FT-Raman spectra were recorded in the region of 4000-400 cm(-1) and 3500-50 cm(-1) respectively. The scaled wavenumbers are compared with the experimental values. The difference between the observed and scaled wavenumber values of the most fundamentals is very small. The formation of hydrogen bond was investigated in terms of the charge density by the NBO analysis. Natural Population Analysis (NPA) was used for charge determination in the title molecule. Besides, molecular electrostatic potential (MEP), frontier molecular orbitals (FMO) analysis were investigated using theoretical calculations.
Collapse
Affiliation(s)
- M Kandasamy
- Department of Physics, Arignar Anna Govt. Arts College, Namakkal 637 002, India.
| | - G Velraj
- Department of Physics, Periyar University, Salem 636 011, India
| | - S Kalaichelvan
- Tamilnadu Teachers Education University, Lady Willington College Campus, Chennai 600 005, India
| | - G Mariappan
- Department of Physics (Engg.), Annamalai University, Annamalai Nagar 608 002, Chidambaram, Tamil Nadu, India
| |
Collapse
|
5
|
Shailajha S, Rajesh Kannan U, Sheik Abdul Kadhar SP, Isac Paulraj E. Molecular structure, vibrational spectra and (13)C and (1)H NMR spectral analysis of 1-methylnaphthalene by ab initio HF and DFT methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:720-729. [PMID: 24996214 DOI: 10.1016/j.saa.2014.06.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 05/20/2014] [Accepted: 06/03/2014] [Indexed: 06/03/2023]
Abstract
The Fourier transform infrared (FT-IR) and FT-Raman of 1-methylnaphthalene (1MN) have been recorded and analyzed. The equilibrium geometry, bond lengths, bond angles and harmonic vibrational frequencies have been investigated with the help of density functional theory (DFT) method. Vibrational spectroscopic assignments of 1-methylnaphthalene (1MN) are carried out with the help of quantum chemical calculation. The (1)H and (13)C nuclear magnetic resonance (NMR) chemical shifts of the molecule are calculated by the Gauge including atomic orbital (GIAO) method. The molecular stability and bond strength have been investigated by using natural bond orbital analysis (NBO). The assignments of vibrational spectra have been carried out with the help of normal co-ordinate analysis (NCA) following the scaled quantum mechanical force field (SQMFF) methodology. The (1)H and (13)C nuclear magnetic resonance (NMR) chemical shift of the molecular is depend only on the structure of the molecule. The calculated HOMO and LUMO energy shows that charge transfer interactions take place within the molecule. Finally, the calculation results are applied to simulate infrared and Raman spectra of the title compound which show good agreement with observed spectra.
Collapse
Affiliation(s)
- S Shailajha
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India.
| | - U Rajesh Kannan
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India
| | - S P Sheik Abdul Kadhar
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, Tamil Nadu, India
| | - E Isac Paulraj
- Department of Physics, Pallavan College of Engineering, Kancheepuram 631502, Tamil Nadu, India
| |
Collapse
|
6
|
Ostojić BD, Stanković B, Ðorđević DS. Theoretical study of the molecular properties of dimethylanthracenes as properties for the prediction of their biodegradation and mutagenicity. CHEMOSPHERE 2014; 111:144-150. [PMID: 24997911 DOI: 10.1016/j.chemosphere.2014.03.067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2014] [Revised: 03/13/2014] [Accepted: 03/18/2014] [Indexed: 06/03/2023]
Abstract
There is little information available on methyl derivatives of anthracene and their interaction with the enzymes of bacterial consortia that could be found in petroleum sludge. In this study a theoretical investigation of all dimethylanthracenes (DMA) isomers and their relation to biodegradation are presented. Equilibrium geometries, ionization potentials (IP), electronic affinities (EA), dipole moments and electronic dipole polarizabilities of DMA isomers calculated by Density Functional Theory (DFT) methods are reported. The calculated IP and EA values vary little along the series of isomers. The polarizability values (〈α〉, Δα, and αyy) increase on passing from meso,meso- and α,meso- to β,β-DMA isomers. The computed polarizability values of DMAs can be used as predictors in determining differences in biodegradation rates of DMAs. The summation over Raman activity ∑ARaman over 3N-6 vibrational modes is sensitive to the position of the methyl substituent. The ∑ARaman values of 1-methylanthracene (MA), 2-MA, 2,9-DMA and 9,10-DMA are consistent with observed mutagenic activities in Salmonella Typhimurium strains TA98 and TA100.
Collapse
Affiliation(s)
- Bojana D Ostojić
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia.
| | - Branislav Stanković
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11 000 Belgrade, Serbia
| | - Dragana S Ðorđević
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia
| |
Collapse
|
7
|
Mariappan G, Sundaraganesan N. FT-IR, FT-Raman spectra, density functional computations of the vibrational spectra, molecular geometry, conformational stability and some molecular properties of 1-Bromo-2,3-dimethoxynaphthalene. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.04.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
8
|
Alparone A. Static and dynamic electronic (hyper)polarizabilities of dimethylnaphthalene isomers: characterization of spatial contributions by density analysis. ScientificWorldJournal 2013; 2013:832682. [PMID: 24288508 PMCID: PMC3830888 DOI: 10.1155/2013/832682] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 09/04/2013] [Indexed: 01/11/2023] Open
Abstract
Static and frequency-dependent electronic (hyper)polarizabilities of the dimethylnaphthalene (DMN) isomers were computed in vacuum using the Coulomb-attenuating Density Functional Theory method. The nonlinear optical Second Harmonic Generation (SHG) and Electro-Optical Pockels Effect (EOPE) were investigated at the characteristic Nd:YAG laser wavelength of 1064 nm. The response electric properties especially the longitudinal polarizability, polarizability anisotropy, and first-order hyperpolarizability are significantly affected by the position of the methyl groups. The SHG and EOPE techniques can be potentially useful to discriminate the α,α-DMN isomers (2,6-DMN < 2,7-DMN < 2,3-DMN) as well as the β,β-DMN isomers (1,5-DMN < 1,4-DMN < 1,8-DMN). The (hyper)polarizability differences among the investigated DMNs were elucidated through density analysis calculations. The predicted polarizabilities exhibit good linear relationships with the experimental first-order biomass-normalized rate coefficient, a physicochemical property connected to the rates of biodegradation processes of polycyclic aromatic hydrocarbons.
Collapse
Affiliation(s)
- Andrea Alparone
- Department of Chemistry, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| |
Collapse
|
9
|
Ostojić BD, Đorđević DS. The electronic properties of trimethylnaphthalenes as properties for the prediction of biodegradation rates: ab initio and DFT study. CHEMOSPHERE 2012; 88:91-97. [PMID: 22440638 DOI: 10.1016/j.chemosphere.2012.02.071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 02/21/2012] [Accepted: 02/24/2012] [Indexed: 05/31/2023]
Abstract
There is little information on trimethylnaphthalenes (TMNs) which are constituents of diesel fuel and bitumen emissions. In this study, a theoretical investigation of the electronic properties of all trimethylnaphthalene (TMN) isomers and their relation to biodegradation are presented. Equilibrium geometries, ionization potentials (IPs), electron affinities (EAs), dipole moments and electronic dipole polarizabilities of TMN isomers calculated by ab initio and Density Functional Theory (DFT) methods are reported. Polarizability and dipole moment computations have been performed in gas and in water solution using the polarizable continuum model (PCM). The results obtained show that the IP value varies little along the series of isomers while averaged static dipole polarizabilities (<α>) increase on passing from α,α,α-TMN to β,β,β-TMN isomers. This indicates that the binding affinity between TMNs and active site of bacterial enzymes is mainly determined by dispersive and inductive effects. Therefore, the computed polarizability values of TMNs can be used as predictors of the rates of biodegradation of TMNs.
Collapse
Affiliation(s)
- Bojana D Ostojić
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Studentski trg 14-16, 11 000 Belgrade, Serbia.
| | | |
Collapse
|
10
|
Alparone A, Librando V. Physicochemical characterization of environmental mutagens: 3-nitro-6-azabenzo[a]pyrene and its N-oxide derivative. MONATSHEFTE FUR CHEMIE 2012. [DOI: 10.1007/s00706-012-0787-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
11
|
Alparone A, Librando V. IR and Raman spectra of nitroanthracene isomers: substitional effects based on density functional theory study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 89:129-136. [PMID: 22257717 DOI: 10.1016/j.saa.2011.12.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Revised: 11/27/2011] [Accepted: 12/21/2011] [Indexed: 05/31/2023]
Abstract
Structure, IR and Raman spectra of 1-, 2- and 9-nitroanthracene isomers (1-NA, 2-NA and 9-NA) were calculated and analyzed through density functional theory computations using the B3LYP functional with the 6-311+G** basis set. Steric and π-conjugative effects determine the characteristic ONCC dihedral angles, which vary from 0° (2-NA) to 28-29° (1-NA) and 59° (9-NA), influencing the relative order of stability along the series 9-NA<1-NA<2-NA. The spectral regions at wavenumber values>3000 cm(-1) and <1000 cm(-1) little depend on the substituent position. The Raman and IR intensity values of the characteristic symmetric nitro group stretching transition, appearing between 1310 and 1345 cm(-1), are rather sensitive to the position of the substituent, decreasing regularly on passing from the planar to the NO2-rotated isomers (9-NA<1-NA<2-NA). In the medium-energy spectral region (1000-1700 cm(-1)), the number and the relative position of the strongest Raman bands are of potential utility to discriminate the NA isomers. Structural and spectroscopic results suggest that the unknown mutagenic activity of 1-NA is expected to be between that of 9-NA and 2-NA.
Collapse
Affiliation(s)
- Andrea Alparone
- Research Centre for Analysis, Monitoring and Minimization Methods of Environmental Risk, Department of Chemistry, University of Catania, viale A. Doria 6, Catania 95125, Italy
| | | |
Collapse
|
12
|
Raman DFT study of dimethylnaphthalenes: isomer identification and prediction of biodegradation rate coefficients. Struct Chem 2012. [DOI: 10.1007/s11224-012-9951-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
13
|
Nagabalasubramanian PB, Karabacak M, Periandy S. Molecular structure, polarizability, hyperpolarizability analysis and spectroscopic characterization of 1-(chloromethyl)-2-methylnaphthalene with experimental (FT-IR and FT-Raman) techniques and quantum chemical calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 85:43-52. [PMID: 22024457 DOI: 10.1016/j.saa.2011.09.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 08/27/2011] [Accepted: 09/01/2011] [Indexed: 05/31/2023]
Abstract
In this work, the FT-IR and FT-Raman spectrum of 1-(chloromethyl)-2-methyl naphthalene (abbreviated as 1-ClM-2MN, C(12)H(11)Cl) have been recorded in the region 3600-10cm(-1). The optimum molecular geometry, normal mode wavenumbers, infrared and Raman intensities, Raman scattering activities, corresponding vibrational assignments, Mullikan atomic charges and thermo-dynamical parameters were investigated with the help of HF and B3LYP (DFT) method using 6-311G(d,p), 6-311++G(d,p) basis sets. Also, the dipole moment, linear polarizabilities, anisotropy, first and second hyperpolarizabilities values were also computed using the same basis set. Reliable vibrational assignments were made on the basis of total energy distribution (TED) calculated with scaled quantum mechanical (SQM) method. The correlation equations between heat capacities, entropies, enthalpy changes and temperatures were fitted by quadratic formulas. Lower value in the HOMO and LUMO energy gap explains the eventual charge transfer interactions taking place within the molecule. UV-vis spectral analysis of 1-ClM-2MN has been researched by theoretical calculations. In order to understand the electronic transitions of the compound, TD-DFT calculations on electronic absorption spectra in gas phase and solvent (DMSO and chloroform) were performed. The calculated frontier orbital energies, absorption wavelengths (λ), oscillator strengths (f) and excitation energies (E) for gas phase and solvent are also illustrated.
Collapse
|
14
|
Computational note on the structure and vibrational spectra of organic micropollutants: 1-Ethylnaphthalene and 2-ethylnaphthalene. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.01.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
15
|
Librando V, Alparone A. The role of electronic properties to the mutagenic activity of 1,6- and 3,6-dinitrobenzo[a]pyrene isomers. JOURNAL OF HAZARDOUS MATERIALS 2009; 161:1338-1346. [PMID: 18571843 DOI: 10.1016/j.jhazmat.2008.04.095] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2008] [Revised: 04/22/2008] [Accepted: 04/23/2008] [Indexed: 05/26/2023]
Abstract
Equilibrium geometries, infrared spectra, vertical first ionization potential (IP), electronic affinity (EA), dipole moment (mu) and electronic dipole polarizability (alpha) of 1,6- and 3,6-dinitrobenzo[a]pyrene isomers (1,6-DNBaP and 3,6-DNBaP) were evaluated by means of Density Functional Theory (DFT) and recent semiempirical PM6 method. Structural, energetic and vibrational properties of DNBaP isomers are substantially similar to each other. Calculated IP, EA and alpha values of these isomers are practically identical, while mu of 3,6-DNBaP (8.2 D at DFT level) is predicted to be ca. 4 times the value of 1,6-DNBaP isomer (1.9 D at DFT level), owing to favorable mutual orientation of the individual nitro group vectors. Higher direct-mutagenic activities of 3,6-DNBaP with respect to 1,6-DNBaP isomer by 1-2 orders of magnitude might be determined by its peculiar electronic charge distribution, which through stronger electrostatic and inductive interactions, can promote much more effectively binding to active-site of enzymes involved in mutagenic pathways. On the other hand, orientation of the nitro substituents relatively to the plane of the aromatic moiety, molecular sizes, as well as nitroreduction and oxidation reactions seem not to have a key role in the determination of the different mutagenic behaviour of these isomers.
Collapse
Affiliation(s)
- Vito Librando
- Research Centre for Analysis, Monitoring and Minimization Methods of Environmental Risk and Department of Chemistry, University of Catania, viale A. Doria 8, I-95125 Catania, Italy.
| | | |
Collapse
|
16
|
Librando V, Alparone A. Prediction of mutagenic activity of nitronaphthalene isomers by infrared and Raman spectroscopy. JOURNAL OF HAZARDOUS MATERIALS 2008; 154:1158-1165. [PMID: 18093730 DOI: 10.1016/j.jhazmat.2007.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2007] [Revised: 11/07/2007] [Accepted: 11/08/2007] [Indexed: 05/25/2023]
Abstract
IR and Raman spectra of 1- and 2-nitronaphthalene isomers (1-NN and 2-NN) have been investigated to obtain more insight into the effect of the structure on mutagenic properties. To this purpose we have performed density functional theory calculations using B3LYP functional with cc-pVDZ basis set. The results have shown that IR and Raman spectra of nitronaphthalene isomers are somewhat similar to each other. A notable exception regards the symmetrical NO bonds stretching +CN bond stretching vibration (nusNO2+nuCN), which appears as very intense peak near 1350 cm(-1) in IR and Raman spectra of both isomers. Present calculations predict that for 2-NN isomer IR and Raman absorptions of this vibration are more intense by ca. 50 and 60%, respectively, than those of 1-NN isomer. The noticeably higher IR and Raman intensity values of the nusNO2+nuCN mode for 2-NN originate, respectively, from large dipole moment and polarizability changes with respect to the normal mode, suggesting that intermolecular interactions are especially favoured along this coordinate. These results are consistent with higher mutagenic activities of 2-NN in comparison to 1-NN isomer, supporting the binding to enzyme mechanism as a determining step in mutagenic pathways for this series of nitroaromatic compounds.
Collapse
Affiliation(s)
- Vito Librando
- Research Centre for Analysis, Monitoring and Minimization Methods of Environmental Risk and Department of Chemistry, University of Catania, viale A. Doria 8, Catania 95125, Italy.
| | | |
Collapse
|
17
|
Librando V, Alparone A, Tomaselli G. Electronic properties of some nitrobenzo[a]pyrene isomers: a possible relationship to mutagenic activity. J Mol Model 2008; 14:489-97. [DOI: 10.1007/s00894-008-0297-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2007] [Accepted: 02/18/2008] [Indexed: 11/29/2022]
|