ArticleAngewandte Chemie (International ed. in English)2026
Spatial Molecular Decoupling Design for High-Z and Fast Organic Scintillators.
Article in Angewandte Chemie (International ed. in English), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Organic scintillators are pivotal for flexible and low-cost radiation detection; however, they face a long-standing "absorption-speed" trade-off: incorporating high-Z elements to enhance X-ray attenuation typically triggers strong spin-orbit coupling (SOC), which quenches prompt fluorescence and diverts excitation energy into slow, microsecond-scale triplet pathways. Here, we present a molecular decoupling strategy to overcome this dilemma, realized in a donor-acceptor-donor (D-A-D) hybridized local and charge-transfer (HLCT) molecule, 4,7-bis(4-(bis(4-iodophenyl)methyl)phenyl)benzo[c][1,2,5]thiadiazole (TPBI). By terminally tethering iodine atoms to the triphenylamine units, we achieve robust X-ray attenuation while preserving a fast "hot-exciton" emission channel. The intrinsic nonplanar geometry and strategic spatial arrangement of the molecule successfully isolate the heavy-atom effect from the emissive core, maintaining the crucial quasi-degeneracy between the T
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