Abstract
Two tetravalent actinide tripodal metalloligands, [Th(H3L)(NO3)(MeO)]·2NO3 (1) and [U(H3L)Cl(MeO)]2[(UO2)Cl4]0.5·3Cl·2CH3OH·2H2O (2) (H3L=tris{[2-{(imidazole)methylidene} amino]ethyl}amine; CH3O=methoxide), were synthesized and structurally characterized. Both 1 and 2 contain the expected tripodal shape with the heptadentate Schiff base wrapping around Th(IV) or U(IV) ion. Further coordination of nitrato/chlorine and methoxide makes a ten-fold and a nine-fold coordination environments for Th(IV) ion (1) and U(IV) ion (2), respectively. Metalloligand 2 is a mixed valent uranium complex due to partial oxidation of U(IV) to U(VI). These tripodal metalloligands will have the potential to link secondary metal ions via deprotonated imidazole nitrogen donors to form either discrete heterometallic cages or supramolecular assemblies containing tetravalent actinide ions.
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