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Title: The hydrogen-bond collective dynamics in liquid methanol

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep39533· OSTI ID:1341641
 [1];  [2];  [3];  [4];  [5];  [1];  [4]
  1. Univ. of Firenze (Italy)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Inst. Italiano di Tecnologia, Rome (Italy)
  4. Consiglio Nazionale delle Ricerche (Italy)
  5. Inst. Laue-Langevin (ILL), Grenoble (France)

The relatively simple molecular structure of hydrogen-bonded (HB) systems is often belied by their exceptionally complex thermodynamic and microscopic behaviour. For this reason, after a thorough experimental, computational and theoretical scrutiny, the dynamics of molecules in HB systems still eludes a comprehensive understanding. Aiming at shedding some insight into this topic, we jointly used neutron Brillouin scattering and molecular dynamics simulations to probe the dynamics of a prototypical hydrogen-bonded alcohol, liquid methanol. The comparison with the most thoroughly investigated HB system, liquid water, pinpoints common behaviours of their THz microscopic dynamics, thereby providing additional information on the role of HB dynamics in these two systems. This study demonstrates that the dynamic behaviour of methanol is much richer than what so far known, and prompts us to establish striking analogies with the features of liquid and supercooled water. In particular, based on the strong differences between the structural properties of the two systems, our results suggest that the assignment of some dynamical properties to the tetrahedral character of water structure should be questioned. We finally highlight the similarities between the characteristic decay times of the time correlation function, as obtained from our data and the mean lifetime of hydrogen bond known in literature.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704
OSTI ID:
1341641
Report Number(s):
BNL-113359-2016-JA
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (5)

Microscopic origin of the scattering pre-peak in aqueous propylamine mixtures: X-ray and neutron experiments versus simulations journal January 2019
Density of states from mode expansion of the self-dynamic structure factor of a liquid metal journal January 2017
Switching off hydrogen-bond-driven excitation modes in liquid methanol journal August 2017
Interpreting the Terahertz Spectrum of Complex Materials: The Unique Contribution of the Bayesian Analysis journal September 2019
DL_ANALYSER Notation for Atomic Interactions (DANAI): A Natural Annotation System for Molecular Interactions, Using Ethanoic Acid Liquid as a Test Case journal December 2017

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