Early stages of radiolysis of solutions with 2,6-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-benzo-[1,2,4]triazin-3-yl)pyridine (CyMe4-BTP) and 6,6′-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-benzo-[1,2,4-]triazin-3-yl)-[2,2′]bipyridine (CyMe4-BTBP) ligands in cyclohexanone, proposed as a solvent for selective actinide extraction, were studied by means of the pulse radiolysis technique with spectrophotometric detection. Transient UV-vis spectra of excited triplet states of ligands, formed by energy transfer from cyclohexanone excited triplet states to ligands, were recorded for the first time. The influence of typical extraction conditions (the presence of diluted acid and O₂ from air) on the mechanisms of reactions in the system studied was assessed. It was shown that an addition of benzophenone in high concentrations to the system together with its continuous saturation by O₂ could partially protect ligands from radiation damage, caused by the high-energy radiation emitted by the spent nuclear fuel.

中文翻译：

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双-1,2,4-三嗪家族选择性锕系元素萃取剂在环己酮溶液中的放射分解降解


通过脉冲辐射分解技术和分光光度检测，研究了环己酮中 2,6-双（5,5,8,8-四氢-苯并-[1,2,4]三嗪-3-基）吡啶 （CyMe4-BTP） 和 6,6′-双（5,5,8,8-四甲基-5,6,7,8-四氢-苯并-[1,2,4-]三嗪-3-基）-[2,2′] 联吡啶 （CyMe4-BTBP） 配体的溶液辐射分解的早期阶段。首次记录了由环己酮激发的三重态能量转移到配体而形成的配体激发三重态的瞬态紫外-可见光谱。评估了典型提取条件（稀酸和空气中的 O₂）对所研究系统中反应机理的影响。结果表明，向系统中添加高浓度二苯甲酮及其被 O₂ 持续饱和可以部分保护配体免受乏核燃料发出的高能辐射引起的辐射损伤。