Abstract

AbstractThe solvent adducts of the tetravalent actinoid chlorides ThCl4 and UCl4 have been isolated with methanol as [ThCl4(MeOH)4] 1 and [UCl4(MeOH)4] 2, and with ethanol as [ThCl4(EtOH)4] 3 and [UCl4(EtOH)4] 4. In hydrochloric acid [ThCl2(H2O)7](Cl)2(H2O)2 5 forms, which is isotypic to the known [UCl2(H2O)7](Cl)2(H2O)2 6. The adducts have been analysed using SXRD, IR, CHN, TGA‐MS and PXRD. The material can be isolated from saturated organic (1–4) or acidic aqueous (5–6) solutions, however, drying of the isolated material results in loss of HCl and the formation of oxide species, confirmed by the isolation of U3O8 after complete thermal decomposition.

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