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Updated: Mar 29, 2026
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
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Comparisons and Contrasts in a Complete Set of Alkali Metal Cumyl Structures
Paul D L Ferguson1, David E Anderson2, Eva Hevia2
1Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K.
Inorganic Chemistry
|March 27, 2026
Summary
Alkali-metal complexes with cumene show methyl groups localize charge, favoring alpha-metalation over ring-metalation. This leads to consistent M-Ph interactions and sp2 hybridization across different alkali metals, influencing aggregation states.
Area of Science:
- Organometallic Chemistry
- Main group chemistry
Background:
- Alkali-metal benzyl complexes exhibit varying coordination based on metal properties.
- Toluene-derived complexes show a transition from sigma bonds to pi system interactions with increasing metal size.
Purpose of the Study:
- Investigate the effect of methyl groups on alkali-metal cumene complexation.
- Determine how electron-donating groups influence metal-ligand bonding and charge distribution.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy to study isomers.
- X-ray crystallography to characterize structures.
- Synthesis of alkali-metal complexes using alkyl lithium and Lochmann-Schlosser bases.
Main Results:
- Cumene complexes show competitive alpha- and ring-metalation with alkyl lithium bases.
- Heavier alkali-metal complexes exclusively undergo alpha-metalation.
- Methyl groups induce M-Ph interactions and sp2 hybridization at the alpha-carbon, regardless of the alkali metal.
- Observed varying aggregation states: monomeric (Na), polymeric (K, Cs), and tetrameric (Rb).
Conclusions:
- Electron-donating methyl groups in cumene complexes localize charge, leading to consistent metal-ligand interactions.
- The steric and electronic effects of methyl groups override the typical alkali-metal-dependent coordination trends.
- Aggregation states of alkali-metal cumene complexes are diverse and metal-dependent.
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