TY - DATA T1 - A New Tripodal Ligand System with Steric and Electronic Modularity for Uranium Coordination Chemistry PY - 2009/10/05 AU - Suzanne C. Bart AU - Frank W. Heinemann AU - Christian Anthon AU - Christina Hauser AU - Karsten Meyer UR - https://acs.figshare.com/articles/journal_contribution/A_New_Tripodal_Ligand_System_with_Steric_and_Electronic_Modularity_for_Uranium_Coordination_Chemistry/2823769 DO - 10.1021/ic9012697.s002 L4 - https://ndownloader.figshare.com/files/4521454 KW - aryloxide substituents KW - crystal structures KW - Electronic Modularity KW - uranium KW - complex KW - Uranium Coordination ChemistryThe synthesis KW - spectroscopic studies KW - tBuArO KW - tripodal ligand KW - mesityl fragment increases KW - reactivity studies KW - anchor KW - triazacyclononane KW - New Tripodal Ligand System N2 - The synthesis of a potentially redox active tripodal ligand containing a tris(aryloxide) functionalized mesitylene anchor, ((tBuArOH)3mes) (1), and its metalation with low-valent uranium to form [((tBuArO)3mes)U] (1-U) is reported. The results from characterization by X-ray crystallography, spectroscopic studies, and computational analysis, as well as initial reactivity studies, support a +3 uranium oxidation state. Comparison to the previously synthesized complex, [((tBuArO)3tacn)U] (2-U), featuring the redox-innocent triazacyclononane anchor reveals that changing the anchor from the flexible triazacyclononane to a rigid mesityl fragment increases the structural flexibility of the aryloxide substituents in complexes of 1. The synthesis and crystal structures of uranium(IV) amide complexes of 1-U and 2-U are discussed. ER -