Characterizing pressure-induced uranium C-H agostic bonds

Polly L. Arnold, Alessandro Prescimone, Joy H. Farnaby, Stephen M Mansell, Simon Parsons, Nikolas Kaltsoyannis

Research output: Contribution to journalArticle

31 Citations (Scopus)
66 Downloads (Pure)

Abstract

The diuranium(III) compound [UN′′<inf>2</inf>]<inf>2</inf>(μ-η<sup>6</sup>:η<sup>6</sup>-C<inf>6</inf>H<inf>6</inf>) (N′′=N(SiMe<inf>3</inf>)<inf>2</inf>) has been studied using variable, high-pressure single-crystal X-ray crystallography, and density functional theory . In this compound, the low-coordinate metal cations are coupled through π- and δ-symmetric arene overlap and show close metal-CH contacts with the flexible methyl CH groups of the sterically encumbered amido ligands. The metal-metal separation decreases with increasing pressure, but the most significant structural changes are to the close contacts between ligand CH bonds and the U centers. Although the interatomic distances are suggestive of agostic-type interactions between the U and ligand peripheral CH groups, QTAIM (quantum theory of atoms-in-molecules) computational analysis suggests that there is no such interaction at ambient pressure. However, QTAIM and NBO analyses indicate that the interaction becomes agostic at 3.2 GPa.

Original languageEnglish
Pages (from-to)6735-6739
JournalAngewandte Chemie International Edition
Volume54
Issue number23
Early online date16 Apr 2015
DOIs
Publication statusPublished - 1 Jun 2015

Keywords

  • Actinides
  • Density functional calculations
  • High-pressure chemistry
  • Uranium
  • X-ray diffraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis

Fingerprint Dive into the research topics of 'Characterizing pressure-induced uranium C-H agostic bonds'. Together they form a unique fingerprint.

Cite this