Hydrogen bonding and dynamics of methanol by high-pressure diamond-anvil cell NMR

Takuo Okuchi, George D. Cody, Ho Kwang Mao, Russell J. Hemley

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Liquid methanol at densities up to ρ ρ 0 =1.7 was studied by NMR in a specially designed diamond-anvil cell. Methyl and hydroxyl resonances have been separately observed at pressures to 43 kbars which exceeds equilibrium freezing pressure of methanol. The chemical shift difference between methyl and hydroxyl protons increases nonlinearly with increasing density, indicating a noticeable decrease in hydrogen bond length. The analyses of spin-lattice relaxation rates of both hydroxyl and methyl protons indicate that compression enhances intermolecular proton exchange and selectively reduces motion of the hydroxyl protons. Collectively these observations reveal that hydrogen bonding interaction in liquid methanol noticeably increases with compression, inhibiting the liquid-solid transition even above the freezing pressure.

Original languageEnglish
Article number244509
JournalThe Journal of Chemical Physics
Volume122
Issue number24
DOIs
Publication statusPublished - 2005
Externally publishedYes

Fingerprint

Diamond
anvils
Hydroxyl Radical
Methanol
Protons
Hydrogen bonds
methyl alcohol
diamonds
Nuclear magnetic resonance
nuclear magnetic resonance
protons
hydrogen
cells
Freezing
freezing
Liquids
liquids
Spin-lattice relaxation
Chemical shift
Bond length

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Hydrogen bonding and dynamics of methanol by high-pressure diamond-anvil cell NMR. / Okuchi, Takuo; Cody, George D.; Mao, Ho Kwang; Hemley, Russell J.

In: The Journal of Chemical Physics, Vol. 122, No. 24, 244509, 2005.

Research output: Contribution to journalArticle

Okuchi, Takuo ; Cody, George D. ; Mao, Ho Kwang ; Hemley, Russell J. / Hydrogen bonding and dynamics of methanol by high-pressure diamond-anvil cell NMR. In: The Journal of Chemical Physics. 2005 ; Vol. 122, No. 24.
@article{a2ec8031640a4eb799434b7d18b9c8c2,
title = "Hydrogen bonding and dynamics of methanol by high-pressure diamond-anvil cell NMR",
abstract = "Liquid methanol at densities up to ρ ρ 0 =1.7 was studied by NMR in a specially designed diamond-anvil cell. Methyl and hydroxyl resonances have been separately observed at pressures to 43 kbars which exceeds equilibrium freezing pressure of methanol. The chemical shift difference between methyl and hydroxyl protons increases nonlinearly with increasing density, indicating a noticeable decrease in hydrogen bond length. The analyses of spin-lattice relaxation rates of both hydroxyl and methyl protons indicate that compression enhances intermolecular proton exchange and selectively reduces motion of the hydroxyl protons. Collectively these observations reveal that hydrogen bonding interaction in liquid methanol noticeably increases with compression, inhibiting the liquid-solid transition even above the freezing pressure.",
author = "Takuo Okuchi and Cody, {George D.} and Mao, {Ho Kwang} and Hemley, {Russell J.}",
year = "2005",
doi = "10.1063/1.1944732",
language = "English",
volume = "122",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics Publising LLC",
number = "24",

}

TY - JOUR

T1 - Hydrogen bonding and dynamics of methanol by high-pressure diamond-anvil cell NMR

AU - Okuchi, Takuo

AU - Cody, George D.

AU - Mao, Ho Kwang

AU - Hemley, Russell J.

PY - 2005

Y1 - 2005

N2 - Liquid methanol at densities up to ρ ρ 0 =1.7 was studied by NMR in a specially designed diamond-anvil cell. Methyl and hydroxyl resonances have been separately observed at pressures to 43 kbars which exceeds equilibrium freezing pressure of methanol. The chemical shift difference between methyl and hydroxyl protons increases nonlinearly with increasing density, indicating a noticeable decrease in hydrogen bond length. The analyses of spin-lattice relaxation rates of both hydroxyl and methyl protons indicate that compression enhances intermolecular proton exchange and selectively reduces motion of the hydroxyl protons. Collectively these observations reveal that hydrogen bonding interaction in liquid methanol noticeably increases with compression, inhibiting the liquid-solid transition even above the freezing pressure.

AB - Liquid methanol at densities up to ρ ρ 0 =1.7 was studied by NMR in a specially designed diamond-anvil cell. Methyl and hydroxyl resonances have been separately observed at pressures to 43 kbars which exceeds equilibrium freezing pressure of methanol. The chemical shift difference between methyl and hydroxyl protons increases nonlinearly with increasing density, indicating a noticeable decrease in hydrogen bond length. The analyses of spin-lattice relaxation rates of both hydroxyl and methyl protons indicate that compression enhances intermolecular proton exchange and selectively reduces motion of the hydroxyl protons. Collectively these observations reveal that hydrogen bonding interaction in liquid methanol noticeably increases with compression, inhibiting the liquid-solid transition even above the freezing pressure.

UR - http://www.scopus.com/inward/record.url?scp=22544441617&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=22544441617&partnerID=8YFLogxK

U2 - 10.1063/1.1944732

DO - 10.1063/1.1944732

M3 - Article

AN - SCOPUS:22544441617

VL - 122

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 24

M1 - 244509

ER -