Photoactive High Explosives: Substituents Effects on Tetrazine Photochemistry and Photophysics

The Journal of Physical Chemistry. a
Shawn D McGraneR Jason Scharff

Abstract

High explosives that are photoactive, i.e., can be initiated with light, offer significant advantages in reduced potential for accidental electrical initiation. We examined a series of structurally related tetrazine based photoactive high explosive materials to detail their photochemical and photophysical properties. Using photobleaching infrared absorption, we determined quantum yields of photochemistry for nanosecond pulsed excitation at 355 and 532 nm. Changes in mass spectrometry during laser irradiation in vacuum measured the evolution of gaseous products. Fluorescence spectra, quantum yields, and lifetimes were measured to observe radiative channels of energy decay that compete with photochemistry. For the 6 materials studied, quantum yields of photochemistry ranged from <10(-5) to 0.03 and quantum yield of fluorescence ranged from <10(-3) to 0.33. In all cases, the photoexcitation nonradiatively relaxed primarily to heat, appropriate for supporting photothermal initiation processes. The photochemistry observed was dominated by ring scission of the tetrazine, but there was evidence of more extensive multistep reactions as well.

References

Oct 6, 2005·Journal of the American Chemical Society·M Riad ManaaBruce E Watkins
Mar 23, 2010·Chemical Reviews·Gilles Clavier, Pierre Audebert
May 8, 2015·The Journal of Physical Chemistry. a·Margo T GreenfieldR Jason Scharff

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Citations

Mar 24, 2017·The Journal of Chemical Physics·Andrew E SifainSergei Tretiak
Dec 11, 2021·Physical Chemistry Chemical Physics : PCCP·Junqing YangQi Zhang

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