Selectivity of Rh⋅⋅⋅H-C Binding in a σ-Alkane Complex Controlled by the Secondary Microenvironment in the Solid State.
Samantha K FurfariBengt E TegnerArron L BurnageLaurence R DoyleAlexander J BukvicStuart A MacgregorAndrew S WellerPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2021)
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(tBu2 PCH2 CH2 CH2 PtBu2 )(η2 ,η2 -C7 H12 )][BArF 4 ] (ArF =3,5-(CF3 )2 C6 H3 ), 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.
Keyphrases
- solid state
- room temperature
- stem cells
- ionic liquid
- density functional theory
- dna binding
- crystal structure
- heart rate
- reduced graphene oxide
- highly efficient
- binding protein
- magnetic resonance imaging
- molecular dynamics simulations
- gold nanoparticles
- transcription factor
- heart rate variability
- metal organic framework
- molecular docking
- visible light
- contrast enhanced
- structural basis