Alcohol Self-Aggregation: the Preferred Configurations of the Ethanol Trimer

Seema Murugachandran; Isabel Peña; Al Mokhtar Lamsabhi; Manuel Yáñez; M Eugenia Sanz

doi:10.1002/anie.202415229

Alcohol Self-Aggregation: the Preferred Configurations of the Ethanol Trimer

Seema Murugachandran, Isabel Peña, Al Mokhtar Lamsabhi, Manuel Yáñez, M Eugenia Sanz

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

An atomic-level knowledge of the aggregation of archetypal molecular systems is essential to accurately model supramolecular structures and the transition from gas to liquid phase. The structures and forces involved in ethanol aggregation have been investigated using microwave spectroscopy and extensive quantum chemical calculations. Four isomers of the ethanol trimer have been observed and identified based on comparisons between experimental and predicted spectroscopic parameters, and considering collisional relaxation in the supersonic expansion. All observed isomers exhibit O−H (Formula presented.) O hydrogen bonds between the hydroxyl groups forming a six-membered ring. Additionally, secondary C−H (Formula presented.) O hydrogen bonds and H (Formula presented.) H dispersion contacts participate in the stabilization of the complexes with remarkably similar energy contributions. Structures where there is a mixture of gauche and trans conformations of ethanol are favored, with gauche conformations being predominant and no evidence of homochirality synchronization. Our results underscore the critical changes involved in aggregation as the size of the system increases and shed light on the unique properties and behavior of ethanol in chemical and biological systems.

Original language	English
Pages (from-to)	e202415229
Journal	ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
DOIs	https://doi.org/10.1002/anie.202415229
Publication status	E-pub ahead of print - 29 Nov 2024

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title = "Alcohol Self-Aggregation: the Preferred Configurations of the Ethanol Trimer",

abstract = "An atomic-level knowledge of the aggregation of archetypal molecular systems is essential to accurately model supramolecular structures and the transition from gas to liquid phase. The structures and forces involved in ethanol aggregation have been investigated using microwave spectroscopy and extensive quantum chemical calculations. Four isomers of the ethanol trimer have been observed and identified based on comparisons between experimental and predicted spectroscopic parameters, and considering collisional relaxation in the supersonic expansion. All observed isomers exhibit O−H (Formula presented.) O hydrogen bonds between the hydroxyl groups forming a six-membered ring. Additionally, secondary C−H (Formula presented.) O hydrogen bonds and H (Formula presented.) H dispersion contacts participate in the stabilization of the complexes with remarkably similar energy contributions. Structures where there is a mixture of gauche and trans conformations of ethanol are favored, with gauche conformations being predominant and no evidence of homochirality synchronization. Our results underscore the critical changes involved in aggregation as the size of the system increases and shed light on the unique properties and behavior of ethanol in chemical and biological systems.",

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AU - Peña, Isabel

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AU - Eugenia Sanz, M

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N2 - An atomic-level knowledge of the aggregation of archetypal molecular systems is essential to accurately model supramolecular structures and the transition from gas to liquid phase. The structures and forces involved in ethanol aggregation have been investigated using microwave spectroscopy and extensive quantum chemical calculations. Four isomers of the ethanol trimer have been observed and identified based on comparisons between experimental and predicted spectroscopic parameters, and considering collisional relaxation in the supersonic expansion. All observed isomers exhibit O−H (Formula presented.) O hydrogen bonds between the hydroxyl groups forming a six-membered ring. Additionally, secondary C−H (Formula presented.) O hydrogen bonds and H (Formula presented.) H dispersion contacts participate in the stabilization of the complexes with remarkably similar energy contributions. Structures where there is a mixture of gauche and trans conformations of ethanol are favored, with gauche conformations being predominant and no evidence of homochirality synchronization. Our results underscore the critical changes involved in aggregation as the size of the system increases and shed light on the unique properties and behavior of ethanol in chemical and biological systems.

AB - An atomic-level knowledge of the aggregation of archetypal molecular systems is essential to accurately model supramolecular structures and the transition from gas to liquid phase. The structures and forces involved in ethanol aggregation have been investigated using microwave spectroscopy and extensive quantum chemical calculations. Four isomers of the ethanol trimer have been observed and identified based on comparisons between experimental and predicted spectroscopic parameters, and considering collisional relaxation in the supersonic expansion. All observed isomers exhibit O−H (Formula presented.) O hydrogen bonds between the hydroxyl groups forming a six-membered ring. Additionally, secondary C−H (Formula presented.) O hydrogen bonds and H (Formula presented.) H dispersion contacts participate in the stabilization of the complexes with remarkably similar energy contributions. Structures where there is a mixture of gauche and trans conformations of ethanol are favored, with gauche conformations being predominant and no evidence of homochirality synchronization. Our results underscore the critical changes involved in aggregation as the size of the system increases and shed light on the unique properties and behavior of ethanol in chemical and biological systems.

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Alcohol Self-Aggregation: the Preferred Configurations of the Ethanol Trimer

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