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Effects of Electric Fields Upon Energetic Molecules: Nitromethane and Dimethylnitramine

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EN
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We have investigated computationally (B3PW91/6-31G**) the effects of electric fields upon certain properties - dipole moments, energies, geometries and electrostatic potentials – of two prototypical energetic molecules, nitromethane and dimethylnitramine. Fields of various strengths and in different directions were considered. The stronger fields significantly polarized the molecular charge distributions, especially when applied parallel to the C-NO2 and the N-NO2 bonds. These directions correspond to the principal polarities of the ground-state molecules, which these parallel fields either reinforce or counteract. With respect to geometries, the changes are primarily conformational, e.g. rotation of the methyl groups or inversion of the pyramidal nitrogen in (H3C)2N-NO2.
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  • Department of Chemistry, University of New Orleans, New Orleans, LA 70148, USA ; Department of Chemistry, Cleveland State University, Cleveland, OH 44115, USA, ppolitze@uno.edu
Bibliografia
  • [1] Kamlet M.J., The Relationship of Impact Sensitivity with Structure of Organic High Explosives. I. Polynitroaliphatic Explosives, Proc. 6th Symp. (Internat.) Deton., Report No. ACR 221, Offce of Naval Research, 1976, 312-322.
  • [2] Adams G.F., Shaw R.W., Jr., Chemical Reactions in Energetic Materials, Annu. Rev. Phys. Chem., 1992, 43, 311-340.
  • [3] Brill T.B., James K.J., Kinetics and Mechanisms of Thermal Decomposition of Nitroaromatic Explosives, Chem. Rev., 1993, 93, 2667-2692.
  • [4] Politzer P., Murray J.S., Sensitivity Correlations, Energetic Materials, Part 2. Detonation, Combustion, (Politzer P., Murray J.S., Eds.), Elsevier, Amsterdam 2003, pp. 5-23.
  • [5] Murray J.S., Politzer P., Structure-Sensitivity Relationships in Energetic Compounds, Chemistry and Physics of Energetic Materials, (Bulusu S. N., Ed.), Kluwer, Dordrecht (The Netherlands) 1990, pp. 157-173.
  • [6] Owens F.J., Calculation of Energy Barriers for Bond Rupture in Some Energetic Molecules, J. Mol. Struct. (Theochem), 1996, 370, 11-16.
  • [7] Politzer P., Murray J.S., Relationships between Dissociation Energies and Electrostatic Potentials of C−NO2 Bonds; Applications to Impact Sensitivities, J. Mol. Struct., 1996, 376, 419-424.
  • [8] Kohno Y., Ueda K., Imamura A., Molecular Dynamics Simulations of Initial Decomposition Process in the Unique N−N Bond in Nitramines in the Crystalline State, J. Phys. Chem., 1996, 100, 4701-4712.
  • [9] Rice B.M., Sahu S., Owens F.J., Density Functional Calculations of Bond Dissociation Energies for NO2 Scission in Some Nitroaromatic Molecules, J. Mol. Struct. (Theochem), 2002, 583, 69-72.
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  • [12] Sjoberg P., Brinck T., Hardsurf program.
  • [13] Stewart R.F., On the Mapping of Electrostatic Properties from Bragg Diffraction Data, Chem. Phys. Lett., 1979, 65, 335-342.
  • [14] Chemical Applications of Atomic and Molecular Electrostatic Potentials, (Politzer P., Truhlar D.G., Eds.), Plenum Press, New York 1981.
  • [15] Murray J.S., Politzer P., Statistical Analysis of the Molecular Surface Electrostatic Potential: An Approach to Describing Noncovalent Interactions in Condensed Phases, J. Mol. Struct. (Theochem), 1998, 425, 107-114.
  • [16] Bonin K.D., Kresin V.V., Electric-Dipole Polarizabilities of Atoms, Molecules and Clusters, World Scientifc, Singapore 1997.
  • [17] Exner O., Böhm S., Inductive Effect of Uncharged Groups: Dependence on Electronegativity, J. Phys. Org. Chem., 2006, 19, 393-401.
  • [18] Handbook of Chemistry and Physics, 87th Ed., (Lide D.R., Ed.), CRC Press, Boca Raton, FL 2006.
  • [19] Jin P., Murray J.S., Politzer P., Computational Determination of the Relative Polarizabilities of Molecular Components, Int. J. Quantum Chem., 2006, 106, 2347-2355.
  • [20] Politzer P., Lane P., Comparison of Density Functional Calculations of C−NO2, N−NO2 and C−NF2 Dissociation Energies, J. Mol. Struct. (Theochem), 1996, 388, 51-55.
  • [21] Wiener J.J.M., Politzer P., Comparison of Various Density Functional Methods for Computing Bond Dissociation Energies, ibid., 1998, 427, 171.
  • [22] Murray J.S., Lane P., Politzer P., Relationships Between Impact Sensitivities and Molecular Surface Electrostatic Potentials of Nitroaromatic and Nitroheterocyclic Molecules, Mol. Phys., 1995, 85, 1-8.
  • [23] Politzer P., Murray J.S., C–NO2 Dissociation Energies and Surface Electrostatic Potential Maxima in Relation to the Impact Sensitivities of Some Nitroheterocyclic Molecules, ibid., 1995, 86, 251-255.
  • [24] Politzer P., Laurence P.R., Abrahmsen L., Zilles B.A., Sjoberg P., The Aromatic C-NO2 Bond as a Site for Nucleophilic Attack, Chem. Phys. Lett., 1984, 111, 75-78.
  • [25] Murray J.S., Lane P., Politzer P., Electrostatic Potential Analysis of the π Regions of Some Naphthalene Derivatives, J. Mol. Struct. (Theochem), 1990, 209, 163-175.
  • [26] Murray J.S., Lane P., Politzer P., Effects of Strongly Electron-Attracting Components on Molecular Surface Electrostatic Potentials: Applications to Predicting Impact Sensitivities of Energetic Molecules, Mol. Phys., 1998, 93, 187-194.
  • [27] Murray J.S., Peralta-Inga Z., Politzer P., Computed Molecular Surface Electrostatic Potentials of the Nonionic and Zwitterionic Forms of Glycine, Histidine and Tetracycline, Int. J. Quantum Chem., 2000, 80, 1216-1223.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BAT1-0035-0053
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