@article {43612,
	title = {Uranium(iv) cyclobutadienyl sandwich compounds: Synthesis, structure and chemical bonding},
	journal = {Chemical Communications},
	volume = {56},
	year = {2020},
	month = {2020},
	pages = {944 - 947},
	publisher = {Royal Society of Chemistry},
	abstract = {The 1:1 reactions of uranium(iv) tetrakis(borohydride) with the sodium and potassium salts of the cyclobutadienyl anion [C4(SiMe3)4]2- (Cb'''') produce the half-sandwich complexes [Na(12-crown-4)2][U(η4-Cb'''')(BH4)3] and [U(η4-Cb'''')(μ-BH4)3{K(THF)2}]2. In the 1:2 reaction of U(BH4)4 with Na2Cb'''', formation of [U(η4-Cb'''')(η3-C4H(SiMe3)3-κ-(CH2SiMe2)(BH4))]- reveals that a Cb'''' ligand undergoes an intramolecular deprotonation, resulting in an allyl/tuck-in bonding mode. A computational study reveals that the uranium-Cb'''' bonding has an appreciable covalent component with contributions from the uranium 5f and 6d orbitals.},
	author = {Tsoureas, Nikolaos and Mansikkam{\"a}ki, Akseli and Layfield, Richard A.}
}
