skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Communication: Hydrogen bonding interactions in water-alcohol mixtures from X-ray absorption spectroscopy

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4951010· OSTI ID:1532188
 [1];  [1]; ORCiD logo [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

While methanol and ethanol are macroscopically miscible with water, their mixtures exhibit negative excess entropies of mixing. Despite considerable effort in both experiment and theory, there remains significant disagreement regarding the origin of this effect. Different models for the liquid mixture structure have been proposed to address this behavior, including the enhancement of the water hydrogen bonding network around the alcohol hydrophobic groups and microscopic immiscibility or clustering. We have investigated mixtures of methanol, ethanol, and isopropanol with water by liquid microjet X-ray absorption spectroscopy on the oxygen K-edge, an atom-specific probe providing details of both inter- and intra-molecular structure. The measured spectra evidence a significant enhancement of hydrogen bonding originating from the methanol and ethanol hydroxyl groups upon the addition of water. These additional hydrogen bonding interactions would strengthen the liquid-liquid interactions, resulting in additional ordering in the liquid structures and leading to a reduction in entropy and a negative enthalpy of mixing, consistent with existing thermodynamic data. In contrast, the spectra of the isopropanol-water mixtures exhibit an increase in the number of broken alcohol hydrogen bonds for mixtures containing up to 0.5 water mole fraction, an observation consistent with existing enthalpy of mixing data, suggesting that the measured negative excess entropy is a result of clustering or micro-immiscibility.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1532188
Alternate ID(s):
OSTI ID: 1421169
Journal Information:
Journal of Chemical Physics, Vol. 144, Issue 19; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

References (53)

Molecular‐dynamics simulation of aqueous mixtures: Methanol, acetone, and ammonia journal October 1990
Properties of aqueous nitrate and nitrite from x-ray absorption spectroscopy journal August 2015
Hydrophobic hydration and molecular association in methanol–water mixtures studied by microwave dielectric analysis journal February 2000
X-Ray absorption spectroscopy of LiBF 4 in propylene carbonate: a model lithium ion battery electrolyte journal January 2014
Cation-cation contact pairing in water: Guanidinium journal July 2013
Molecular Structure of Alcohol-Water Mixtures journal October 2003
Local Structures of Methanol–Water Binary Solutions Studied by Soft X-ray Absorption Spectroscopy journal April 2014
Relative strength of hydrogen bond interaction in alcohol–water complexes journal December 2004
Incomplete mixing versus clathrate-like structures: A molecular view on hydrophobicity in methanol–water mixtures journal May 2013
Observation of water dangling OH bonds around dissolved nonpolar groups journal July 2009
Ion solvation dynamics in water–methanol and water– dimethylsulfoxide mixtures journal June 1999
Structural properties of methanol–water binary mixtures within the quantum cluster equilibrium model journal January 2015
Observation of Immobilized Water Molecules around Hydrophobic Groups journal October 2007
173. The free energy of the normal aliphatic alcohols in aqueous solution. Part I. The partial vapour pressures of aqueous solutions of methyl, n-propyl, and n-butyl alcohols. Part II. The solubilities of some normal aliphatic alcohols in water. Part III. The theory of binary solutions, and its application to aqueous-alcoholic solutions journal January 1933
X-Ray Absorption Spectra of Water from First Principles Calculations journal May 2006
Hydrophobic Segregation, Phase Transitions and the Anomalous Thermodynamics of Water/Methanol Mixtures journal November 2012
Molecular dynamics simulations of water-methanol mixtures journal December 1991
Dynamical properties of water-methanol solutions studied by depolarized Rayleigh scattering journal August 1996
Contacts Between Alcohols in Water Are Random Rather than Hydrophobic journal February 2015
Investigation of volatile liquid surfaces by synchrotron x-ray spectroscopy of liquid microjets journal March 2004
Structure and thermodynamic properties of water–methanol mixtures: Role of the water–water interaction journal August 1992
Molecular Dynamics Studies of the Properties of Water around Simple Organic Solutes journal January 1996
Physical Properties and Hydrogen-Bonding Network of Water–Ethanol Mixtures from Molecular Dynamics Simulations journal January 2016
Ab initio molecular dynamics study of aqueous solvation of ethanol and ethylene journal May 2003
Excess Entropy in Alcohol−Water Solutions:  A Simple Clustering Explanation journal March 2006
The hydration structure of aqueous carbonic acid from X-ray absorption spectroscopy journal October 2014
Dielectric properties of glycerol/water mixtures at temperatures between 10 and 50°C journal April 2006
Excess Thermodynamic Properties of Aqueous Alcohol Solutions. journal July 1965
X-ray Spectroscopy of Liquid Water Microjets journal May 2001
Free Volume and Entropy in Condensed Systems III. Entropy in Binary Liquid Mixtures; Partial Molal Entropy in Dilute Solutions; Structure and Thermodynamics in Aqueous Electrolytes journal November 1945
The hydration structure of dissolved carbon dioxide from X-ray absorption spectroscopy journal July 2015
Chemical and electronic structures of liquid methanol from x-ray emission spectroscopy and density functional theory journal March 2005
Liquid–vapor interface of water–methanol mixture. I. Computer simulation journal January 1993
Dynamics of hydration of alcohols and diols in aqueous solutions
  • Ishihara, Yoshimasa; Okouchi, Shoichi; Uedaira, Hisashi
  • Journal of the Chemical Society, Faraday Transactions, Vol. 93, Issue 18 https://doi.org/10.1039/a701969f
journal January 1997
Clustering and microimmiscibility in alcohol-water mixtures: Evidence from molecular-dynamics simulations journal January 2005
Dynamic properties of methanol–water mixtures at the temperatures up to 476.2 K and at high pressures via molecular dynamics simulation journal July 2016
Dynamical aspects of mixing schemes in ethanol–water mixtures in terms of the excess partial molar activation free energy, enthalpy, and entropy of the dielectric relaxation process journal February 1999
Molecular segregation observed in a concentrated alcohol–water solution journal April 2002
Dynamical properties of water-methanol solutions journal February 2016
Measurements and correlations of density and viscosity for short chain (C1–C3) n-alcohol–water mixtures in the temperature range from 350.7 K to 476.2 K at pressures up to 40 MPa journal January 2016
X-ray Absorption Spectroscopy of Liquid Methanol Microjets:  Bulk Electronic Structure and Hydrogen Bonding Network journal May 2005
Non-ideality of binary mixtures Water[ndash ]methanol and water[ndash ]acetonitrile from the viewpoint of clustering structure
  • Wakisaka, Akihiro; Abdoul-Carime, Hassan; Yamamoto, Yoshitaka
  • Journal of the Chemical Society, Faraday Transactions, Vol. 94, Issue 3 https://doi.org/10.1039/a705777f
journal January 1998
Hydrogen-Bonded Cluster Formation and Hydrophobic Solute Association in Aqueous Solutions of Ethanol journal January 1995
Clustering Dynamics in Water/Methanol Mixtures: A Nuclear Magnetic Resonance Study at 205 K < T < 295 K journal August 2008
The cooperative dynamics of the H-bond system in 2-propanol/water mixtures: Steric hindrance effects of nonpolar head group journal November 2003
Molecular clusters in liquid methanol: a Reverse Monte Carlo study journal September 2000
Hydration of methanol in aqueous solution journal December 1993
High pressure Raman spectroscopy of H2O-CH3OH mixtures journal February 2015
Dynamics of ionic and hydrophobic solutes in water-methanol mixtures of varying composition journal December 2005
The influence of chain dynamics on the far-infrared spectrum of liquid methanol-water mixtures journal October 2005
Three-Dimensional Structure in Water−Methanol Mixtures journal August 1997
Composition-dependent dynamical structures of 1-propanol–water mixtures determined by dynamical dielectric properties journal December 2000
Methanol-water solutions: A bi-percolating liquid mixture journal October 2004

Cited By (9)

X-ray absorption signatures of hydrogen-bond structure in water-alcohol solutions journal September 2018
Structures, intermolecular interactions, and chemical hardness of binary water–organic solvents: a molecular dynamics study journal September 2018
Dilution of whisky – the molecular perspective journal August 2017
Intramolecular dehydration of biomass-derived sugar alcohols in high-temperature water journal January 2017
Water fluctuation in methanol, ethanol, and 1-propanol aqueous-mixture probed by Brownian motion journal December 2018
The Stokes-Einstein relation in water/methanol solutions journal June 2019
Bubble Rise Velocity and Surface Mobility in Aqueous Solutions of Sodium Dodecyl Sulphate and n-Propanol journal November 2019
Temperature dependent dynamics in water-ethanol liquid mixtures journal December 2018
Insight into the Hydration of Cationic Surfactants: A Thermodynamic and Dielectric Study of Functionalized Quaternary Ammonium Chlorides journal February 2019