American Chemical Society
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Synthesis and Characterization of the First Sandwich Complex of Trivalent Thorium:  A Structural Comparison with the Uranium Analogue

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journal contribution
posted on 1999-07-14, 00:00 authored by Julian S. Parry, Cloke, Simon J. Coles, Michael B. Hursthouse
Reduction of the bulky 8-annulene thorium complex [Th{COT(TBS)2}2] (COT(TBS)2 = η-C8H6(tBuMe2Si)2-1,4) by potassium yields the anionic compound {Th[COT(TBS)2]2}K·(DME)2, which was crystallographically characterized and is the first sandwich complex of Th(III). EPR spectroscopy indicates that the molecule possesses a 6d1 ground state. A structural comparison is made with the isostructural uranium(III) complex and the thorium(IV) parent compound.