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Tris(pyrazolyl)borate half-sandwich complexes of trivalent uranium incorporating the [C8H6{(SiPr3)-Pr-i-1,4}(2)](2-) and [C8H4{(SiPr3)-Pr-i-1,4)(2)](2-) ligands

journal contribution
posted on 2023-06-08, 06:55 authored by Joy H Farnaby, Geoff Cloke, Martyn P Coles, Jennifer C Green, Georgina Aitken
The reaction of UI3 in THF with KTPme2 and the subsequent addition of [K2(C8H6{(SiPr3)-Pr-i-1,4)(2))] or [K-2(C8H4{(SiPr3)-Pr-i-1,4}(2))] yields dark red [U(K-3-T-P(Me2))(C8H6{(SiPr3)-Pr-i-1,4)(2))] 1and purple [U{K-3-T-P(Me2))(C8H4[(SiPr3)-Pr-i-1,4)(2))] 2, respectively The H-1 NMR of 1 at room temperature suggests a rigid structure, whereas 2 is fluxional in solution on the NMR timescale 1 is unreactive towards CO1 CO2 and MeNC under mild conditions: density functional calculations were used to compare the electronic and steric effects of the T-P(Me2) vs. CP* ligands in mixed sandwich complexes of the type [U(L)(C8H6{SiH3-1,4)2)] (L = Cp* Or (K-3-T-p(Me2))) On heating at 80 degrees C. 1 reacts with excess MeNC to yield [U(C8H6((SiPr3)-Pr-i-1,4)(2))(k(2)-dmpz)(2)(eta(1)-CNMe)] 3 The structures of 1-3 have been determined by single crystal X-ray diffraction.

History

Publication status

  • Published

Journal

Comptes Rendus Chimie

ISSN

1631-0748

Publisher

Elsevier

Issue

6-7

Volume

13

Page range

812-820

Department affiliated with

  • Chemistry Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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