Organochromium(II) and Organonitridochromium(V) N-Heterocyclic Carbene Complexes: Synthesis and Structural Characterization
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The N-heterocyclic carbene-stabilized chromium(II) alkyl, aryl, and alkynyl complexes (IPM)(2)CrR(2) [R = Me (2), Ph (3), C equivalent to CPh (3); IPM = 1,3-diisopropyl-4,5-dimethylimidazole-2-ylidene] were prepared by metathesis reactions of (IPM)(2)CrCl(2) (1) with the corresponding organolithium reagents. Further reaction of 3 with an organic azide, 1-azidoadamantane, yielded an organonitridochromium(V) compound (IPM)(2)Ph(2)Cr equivalent to N (5). Compounds 2-5 are fully characterized by (1)H NMR and IR spectroscopy, X-ray crystallography as well as by elemental analysis. The structural analysis shows that the metal atom adopts a nearly square-planar arrangement in the respective 2, 3, and 4 and a square-pyramidal one in 5. The reaction of 3 with the organic azide to 5 appears a novel way to the organonitridochromium compound.
CitationZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE，2011,637（11）：1597-1601