Crystal structure of the uranium oxo borohydride complex U2(μ-O)(BH4)6(dme)2 (dme = 1,2-dimethoxyethane) and reformulation of U2(μ-H)2(BH4)6(dme)2

► UCl4 + Na(H3BNMe2BH3) in 1,2-dimethoxyethane yields U2(μ-O)(BH4)6(dme)2·C7H8, 1. ► Formation of BH4− groups from H3BNMe2BH3− occurs with the elimination of [Me2NBH2]2. ► Formation of the oxo group probably involves adventitious hydrolysis. ► The X-ray crystal structure of 1 is reported. ► The previously reported hydride U2(μ-H)2(BH4)6(dme)2 is actually the oxo complex 1.