Abstract
In the symmetrical crystal structure of [{U(η 5-C 4Me 4P)(μ-η 5,η 1-C 4Me 4P)(BH 4)} 2], the U-P bond distances for the terminal and bridging η 5-phospholyl ligands are 2.945(3) and 2.995(3) Å respectively, and the U-P (η 1-phospholyl) bond length is equal to 2.996(3) Å; the tridentate borohydride ligands are cis to the (UP) 2 ring. The cis and trans isomers of [{U(Cp ∗)(μ-η 5,η 1C 4 Me 4P)(BH 4)} 2] (Cp ∗ = η 5-C 5Me 5) are in equilibrium in toluene.
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