Modeling Photolytic Decomposition of Energetically Functionalized Dodecanes

Area of Science:

• Computational Chemistry
• Materials Science
• Chemical Engineering

Background:

• Understanding the photolytic stability of explosives is crucial for safe handling and environmental safety.
• Energetic functional groups within explosive molecules are key to their reactivity and stability.
• Previous research has not fully elucidated the photolytic degradation pathways of various energetic groups.

Purpose of the Study:

• To model and analyze the photolytic degradation of dodecane substituted with azide, nitro, nitrate ester, and nitramine functional groups.
• To determine the primary degradation mechanisms initiated by photolysis.
• To compare the photolytic stability of different energetic functional groups.

Main Methods:

• Computational modeling was employed to simulate photolytic degradation.
• Calculations were performed using 4 and 8 eV excitation energies.
• Exciton localization and degradation pathways were analyzed for substituted dodecane molecules.

Main Results:

• Excitons consistently localized on the energetic functional group, initiating degradation there.
• The observed degradation trends aligned with the known thermal and sub-shock stability of the functional groups.
• The azide functional group exhibited behavior inconsistent with predictions, necessitating further study.

Conclusions:

• Photolytic degradation predominantly targets the energetic functional group in these molecules.
• The study provides insights into the relative photolytic stability of nitro, nitrate ester, and nitramine groups.
• Further research is essential to fully comprehend the photolytic effects on the azide functional group.