Cocrystals are a promising class of materials for the future of functional material design and use in electronics and coatings. Herein we report the effects of gamma radiation on both single component- and co-crystalline organic materials. Radiation damage was evaluated via single crystal- and powder- X-ray diffraction, Raman spectroscopy, differential scanning calorimetry, and DFT surface calculations. After irradiation with 11 kGy dose, both single- and multi-component materials were analyzed and compared to their pre-irradiated forms. One of the single components, 1,4-dibromotetrafluorobenzene (1,4-C6Br2F4), underwent enhancement of physical properties affording its sublimation within an hour of exposure to air post-irradiation, attributed to impurities adsorbed to the chemical’s surface. Surface changes are reported for 1,2-bis(4-pyridyl)ethylene (4,4’-bpe) via Raman spectroscopy with drastic change in peak intensities pre- and post-irradiation. Throughout the study, the cocrystal (4,4’-bpe-1,4-C6Br2F4) affords little changes from radiation exposure, thus supporting the rational design of organic materials afford competitive alternatives to traditionally used inorganic materials for radiation damage resistance.

Effects of high ionizing radiation on organic solid-state materials

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ACS Fall 2022

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