Uranium Metalla-Allenes with Carbene Imido R2C=UIV=NR′ Units (R=Ph2PNSiMe3; R′=CPh3): Alkali-Metal-Mediated push–pull effects with an Amido Auxiliary

Lu, Erli and Tuna, Floriana and Lewis, William and Kaltsoyannis, Nikolas and Liddle, Stephen T. (2016) Uranium Metalla-Allenes with Carbene Imido R2C=UIV=NR′ Units (R=Ph2PNSiMe3; R′=CPh3): Alkali-Metal-Mediated push–pull effects with an Amido Auxiliary. Chemistry - A European Journal, 22 (33). pp. 11554-11558. ISSN 1521-3765

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Abstract

We report uranium(IV)-carbene-imido-amide metalla-allene complexes [U(BIPMTMS)(NCPh3)(NHCPh3)(M)] (BIPMTMS=C(PPh2NSiMe3)2; M=Li or K) that can be described as R2C=U=NR′ push–pull metalla-allene units, as organometallic counterparts of the well-known push–pull organic allenes. The solid-state structures reveal that the R2C=U=NR′ units adopt highly unusual cis-arrangements, which are also reproduced by gas-phase theoretical studies conducted without the alkali metals to remove their potential structure-directing roles. Computational studies confirm the double-bond nature of the U=NR′ and U=CR2 interactions, the latter increasingly attenuated by potassium then lithium when compared to the hypothetical alkali-metal-free anion. Combined experimental and theoretical data show that the push–pull effect induced by the alkali metal cations and amide auxiliary gives a fundamental and tunable structural influence over the C=UIV=N units.

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: E.Lu, F.Tuna, W.Lewis, N.Kaltsoyannis, S.T. Liddle, Chem. Eur. J. 2016, 22, 11554, which has been published in final form at doi:10.1002/chem.201602603. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Chemistry
Identification Number: 10.1002/chem.201602603
Depositing User: Lewis, William
Date Deposited: 28 Sep 2017 09:47
Last Modified: 14 Oct 2017 08:36
URI: http://eprints.nottingham.ac.uk/id/eprint/46649

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