J. Brennan, R. Andersen
May 1, 2002
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Journal
Journal of the American Chemical Society
Abstract
The chemical preparation of the isocyanate (1) and imide (2) complexes is described. The most important structural feature of 2 is the presence of the imido functional group with a U-N distance of 2.019 (6) A and a U-N-C angle of 167.4 (6)/sup 0/. Comparison of this bond distance with that of previously prepared tricyclopentadienyluranium complexes, this measurement is the shortest U-N length reported. The essentially linear U-N-C angle suggests that both lone pairs of electrons on the nitrogen atom are involved in bonding to uranium and the U-N bond is best interpreted as a triple bond. The most interesting structural feature of complex l is the (PhNCO)/sup 2 -/ unit which bridges the 2 tetravalent uranium, U(C/sub 5/H/sub 4/CH/sub 3/)/sub 3/, fragments in an nu/sup 1/(U(2)-0), nu/sup 2/(U(1)NC(1)) fashion. 15 references, 2 figures.