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Commonly accepted uranium oxidation states in molecular complexes are+Ⅲ to+Ⅵ.Recently,this has been extended experimentally by the synthesis of seminal U(Ⅱ)complexes,Y·[U(Cp)3] and Y·[URE](Y = K+(2.2.2-cryptand),Cp = C5H4SiMe3,H3RE =(Ad,MeArOH)3mesitylene and Ad = adamantyl).