Selectivity of Rh···H-C Binding in a σ-Alkane Complex Controlled by the Secondary Microenvironment in the Solid-State

Samantha K. Furfari, Bengt E. Tegner, Arron L. Burnage, Laurence R. Doyle, Alexander J. Bukvic, Stuart A. Macgregor, Andrew S. Weller

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Abstract

Single‐crystal to single‐crystal solid‐state molecular organometallic (SMOM) techniques are used for the synthesis and structural characterization of the σ‐alkane complex [Rh(tBu2PCH2CH2CH2PtBu2)(η22‐C7H12)][BArF4] (ArF=3,5‐(CF3)2C6H3), in which the alkane (norbornane) binds through two exo‐C−H⋅⋅⋅Rh interactions. In contrast, the bis‐cyclohexyl phosphine analogue shows endo‐alkane binding. A comparison of the two systems, supported by periodic DFT calculations, NCI plots and Hirshfeld surface analyses, traces this different regioselectivity to subtle changes in the local microenvironment surrounding the alkane ligand. A tertiary periodic structure supporting a secondary microenvironment that controls binding at the metal site has parallels with enzymes. The new σ‐alkane complex is also a catalyst for solid/gas 1‐butene isomerization, and catalyst resting states are identified for this.
Original languageEnglish
Pages (from-to)3177-3183
Number of pages7
JournalChemistry - A European Journal
Volume27
Issue number9
Early online date28 Oct 2020
DOIs
Publication statusPublished - 10 Feb 2021

Keywords

  • SMOM
  • density functional calculations
  • isomerization
  • periodic DFT
  • rhodium
  • selectivity

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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