Figure 5.

¹H NMR comparison of the heterobimetallic U^V-M^I tert-butoxide complexes [UM(O^tBu)₆] (UM-O^tBu-type: UNa-O^tBu, UK-O^tBu, URb-O^tBu, and UCs-O^tBu) measured on a 300 MHz Bruker Avance 300 spectrometer in benzene-d₆. For comparison, the position of the benzene-d₆ signal and the tert-butoxide (^tBu) resonance of UNa-O^tBu are added as dashed reference lines. Minor impurity signals may have originated from residual protonated ligands such as HO^tBu and HN’’ or from small amounts of unreacted starting materials, including [U(O^tBu)₅(py)] [14] and [MN’’] (M = Na–Cs) [47,48].