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Prototypical Cyclohexane Dimers: Spectroscopic Evidence for σ Stacking at Low Temperatures

Abstract

Owing to the fact that σ stacking is as important as π stacking in determining the structural motifs of aliphatic saturated cyclic hydrocarbons, in this work, we have provided the first unambiguous spectroscopic evidence for the existence of σ stacking interaction in cyclohexane dimers at low temperatures. Molecular beam experiments performed using effusive nozzle and supersonic jet sources on cyclohexane in N2 matrix generated cyclohexane dimers stabilized through σ stacking and the dimers were characterized by infrared spectroscopy. The ab initio computations carried out on cyclohexane dimers identified eclipsed (face-to-face), parallel displaced and T-shaped structures, which are predominantly stabilized by σ stacking interactions. While Natural Bond Orbital analysis substantiated a significant amount of σ→σ* interactions involved in the stabilization, the Atoms in Molecules analysis indicated that the stacking is induced by a plausible ‘dihydrogen bonding’ interaction. Energy Decomposition analysis disclosed that a large measure of dispersion interactions effectively contributes for the overall stability of cyclohexane dimers.

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Publication details

The article was received on 23 Sep 2019, accepted on 02 Dec 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9CP05237B
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Prototypical Cyclohexane Dimers: Spectroscopic Evidence for σ Stacking at Low Temperatures

    N. Ramanathan, S. Sarkar and S. Kalyanasundaram, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP05237B

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