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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
Radiolytic degradation of selective actinide extractants from the bis-1,2,4-triazine family in cyclohexanone
Adrian Sulich1,2, Jan Grodkowski2, Krzysztof Bobrowski2
1Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL 02 668, Warsaw, Poland. sulich@ifpan.edu.pl.
Abstract:
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.
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