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Molecular electrostatic potentials and electron densities in nitroazacubanes.
Nilesh R Dhumal1, Ujwala N Patil, Shridhar P Gejji
1Department of Chemistry, University of Pune, Pune-411 007, India.
The Journal of Chemical Physics
|July 23, 2004
Summary
Nitroazacubanes, novel explosives, were studied by computational methods. The lowest energy conformers showed enhanced stability and electron delocalization, correlating with heat of formation.
Area of Science:
- Computational Chemistry
- Materials Science
- Energetic Materials
Background:
- Octanitrocubane is a powerful explosive.
- Nitroazacubanes are derived by replacing C-NO2 groups with nitrogen atoms.
- Understanding their properties is crucial for developing new energetic materials.
Purpose of the Study:
- To investigate the structural and electronic properties of nitroazacubanes.
- To identify stable conformers and their characteristics.
- To correlate electronic properties with energetic performance.
Main Methods:
- Ab initio Hartree-Fock and hybrid density functional calculations.
- Analysis of molecular electrostatic potential and electron density.
- Isodesmic reaction approach for calculating heats of formation.
Main Results:
- Lowest energy conformers exhibit more delocalized electron-rich regions around nitro oxygens.
- These conformers show larger HOMO-LUMO energy gaps.
- Dipole moments depend on nitrogen atom positions; octa-azacubane shows structural robustness.
Conclusions:
- Nitrogen substitution increases electron density at X-N bonds.
- A linear correlation exists between electron density at X-N bonds and heat of formation.
- Destabilized conformers of di- to hexanitroazacubanes have larger dipole moments and heats of formation.