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Uranocene U(C8H8)2 is the most notable cyclooctatetraenide of the f elements and one of the first organouranium compounds to be synthesized. Uranocene is a member of the actinocenes, a group of metallocenes incorporating elements from the actinide series. It is the most studied bisannulene-metal system.
Additional recommended knowledge
Uranocene was first prepared by the reaction of uranium tetrachloride and dipotassium cyclooctatetraene, viz.
Physical and chemical properties
Uranocene is paramagnetic, pyrophoric, and stable to hydrolysis. The η8-cyclooctatetraenyl groups are planar, as expected for a ring containing 10 π-electrons, and are mutually parallel, forming a sandwich containing the uranium atom. In the solid state, the rings are eclipsed, conferring D8h symmetry on the uranocene molecule. In solution the rings rotate with a low energy barrier.
Some examples of analogous compounds of the form M(C8H8)2 exist for M = (Nd, Tb, Pu, Pa, Np, Th, and Yb). Extensions include the air-stable derivative U(C8H4Ph4)2 and the cycloheptatrienyl species [U(C7H7)2]−.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Uranocene". A list of authors is available in Wikipedia.|