Theoretical calculations about nitro-substituted pyridine as high-energy-density compounds (HEDCs)

Area of Science:

• Computational Chemistry
• Materials Science
• Organic Chemistry

Background:

• Nitrogen-rich heterocyclic compounds are crucial for energetic materials.
• Pyridine derivatives offer a versatile scaffold for designing novel energetic molecules.

Purpose of the Study:

• To design and evaluate novel nitro-pyridine derivatives as potential high-energy-density materials.
• To investigate the thermodynamic stability and detonation characteristics of these compounds.

Main Methods:

• Density Functional Theory (DFT) calculations (B3PW91/6-311++G(d,p)//MP2/311++G(d,p)) for thermodynamic properties.
• Calculation of heats of formation, bond orders, and bond dissociation energies.
• Application of the Kamlet-Jacobs equation to predict detonation performance.

Main Results:

• Calculated thermodynamic properties indicate sufficient stability for the synthesized nitro-pyridine derivatives.
• Electronic population analysis explains the observed stability trends.
• Detonation pressure and velocity predictions show excellent energetic character.
• Four specific tetranitropyridine and pentanitropyridine derivatives demonstrated superior performance compared to RDX.

Conclusions:

• Nitro-pyridine derivatives possess significant potential as advanced energetic materials.
• The studied compounds exhibit favorable thermal stability and detonation properties.
• 2,3,4,5-tetranitropyridine, 2,3,5,6-tetranitropyridine, 2,4,5,6-tetranitropyridine, and 2,3,4,5,6-pentanitropyridine are identified as promising candidates for further research.