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Cyclohexane as a Li+ selective ionophore.

G Naresh Patwari¹, James M Lisy

¹Department of Chemistry, University of Illinois at Urbana Champaign, Urbana, Illinois 61801, USA. naresh@chem.iitb.ac.in

The Journal of Physical Chemistry. A

|June 15, 2007

Summary

Alkali metal cations (Li+, Na+, K+) bind to cyclohexane, with Li+ showing unique selectivity. This binding perturbs C-H bonds, with effects decreasing as the cation size increases.

Area of Science:

Physical Chemistry
Spectroscopy
Computational Chemistry

Background:

Understanding alkali metal cation interactions with cyclic hydrocarbons is crucial for fields like supramolecular chemistry and ion transport.
Cyclic ethers like 12-crown-4 are known for their selective cation binding, providing a benchmark for comparison.

Purpose of the Study:

To investigate the binding modes and interactions of alkali metal cations (Li+, Na+, K+) with cyclohexane using infrared photodissociation spectroscopy.
To elucidate the factors governing the selectivity of cyclohexane for different alkali metal ions, particularly Li+.

Main Methods:

Infrared photodissociation spectroscopy was employed to probe the C-H stretching region of M+[cyclohexane][Ar] cluster ions (M = Li, Na, K).
Analysis of spectral shifts and band broadening provided insights into cation-ring interactions and coordination geometry.

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Main Results:

Alkali metal cations coordinate to the cyclohexane ring via eta3 binding on the S6 axis.
Perturbation of C-H stretching modes was observed, with frequency shifts being largest for Li+ and decreasing for Na+ and K+.
Cyclohexane exhibited greater selectivity for Li+ compared to Na+ than the cyclic ether 12-crown-4.

Conclusions:

The observed selectivity of cyclohexane for Li+ is attributed to a charge transfer interaction between Li+ and the cyclohexane molecule.
The findings contribute to understanding non-covalent interactions between metal ions and neutral hydrocarbon frameworks.