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 journalArticlepeer-review

28 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
JournalJournal of Chemical Physics
Volume122
Issue number24
DOIs
Publication statusPublished - Aug 1 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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