Synthesis and Characterization of N-Heterocyclic Carbene Complexes of Uranium(III)

Reaction of [((AdArO)3tacn)UIII] (1) or [((Me3Si)2N)3UIII] (3) with tetramethylimidazol-2-ylidene (Me4IMC:) yields novel N-heterocyclic carbene complexes [((AdArO)3tacn)UIII(Me4IMC:)] (2) and [((Me3Si)2N)3UIII(Me4IMC:)] (4). Uranium complexes 2 and 4 represent the first examples of compds. with an N-heterocyclic carbene ligand coordinated to a low-valent uranium center. The paramagnetic complexes 1, 2, and 4 were characterized by 1H NMR, UV-vis-NIR, and EPR spectroscopy as well as SQUID magnetization measurements and x-ray diffraction analyses. DFT studies indicate a significant degree of pi-bonding in the U(III)-carbene entity. [on SciFinder (R)]


Published in:
Inorganic Chemistry, 43, 3, 855-857
Year:
2004
Keywords:
Note:
CAN 140:235837 29-10 Organometallic and Organometalloidal Compounds Department of Chemistry and Biochemistry,University of California, San Diego,La Jolla,CA,USA. Journal 0020-1669 written in English. 666738-24-5P; 666738-25-6P; 666841-53-8P Role: PRP (Properties), SPN (Synthetic preparation), PREP (Preparation) (crystal structure; synthesis and characterization of tetramethylimidazolylidene heterocyclic carbene complexes of uranium); 666738-23-4P Role: PRP (Properties), RCT (Reactant), SPN (Synthetic preparation), PREP (Preparation), RACT (Reactant or reagent) (mol. structure; synthesis and characterization of tetramethylimidazolylidene heterocyclic carbene complexes of uranium); 4730-54-5; 29912-44-5; 69927-52-2 (Tris[bis(trimethylsilyl)amido]uranium); 141556-40-3 Role: RCT (Reactant), RACT (Reactant or reagent) (synthesis and characterization of tetramethylimidazolylidene heterocyclic carbene complexes of uranium); 666738-27-8P Role: RCT (Reactant), SPN (Synthetic preparation), PREP (Preparation), RACT (Reactant or reagent) (synthesis and characterization of tetramethylimidazolylidene heterocyclic carbene complexes of uranium)
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