Relative acidities of water and methanol and the stabilities of the dimer anions

Journal Article · Thu Dec 04 04:00:00 EST 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100283a019· OSTI ID:7203935

Meot-Ner, M; Sieck, L W

The difference between ..delta..H/sup 0//sub acid/ of H/sub 2/O and CH/sub 3/OH was directly measured to be 9.6 +/- 0.2 kcal/mol at 600 K by variable-temperature pulsed high-pressure mass spectrometry. This result defines ..delta..H/sup 0//sub acid/(CH/sub 3/OH) at 300 K as 381.6 +/- 0.7 kcal/mol and also confirms published values of EA(CH/sub 3/O) and ..delta..H/sup 0//sub D/(CH/sub 3/O-H). H/sub 2/O was also used a reference to measure ..delta..H/sup 0//sub acid/(C/sub 6/H/sub 6/) as 400.7 +/- 0.8 kcal/mol at 600 K. The dissociation energies of the hydrogen-bonded dimers OH/sup -/ H/sub 2/O (26.8 kcal/mol), CH/sub 3/O/sup -/ H/sub 2/O (23.9 kcal/mol), and CH/sub 3/O/sup -/ CH/sub 3/OH (28.8 kcal/mol) were also measured. The former two are found to be in very good agreement with published ab initio results.

• Research Organization: National Bureau of Standards, Gaithersburg, MD
• OSTI ID: 7203935
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:25; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
ANIONS
CHARGED PARTICLES
DATA
DIMERS
DISSOCIATION ENERGY
ENERGY
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
IONS
MASS SPECTROSCOPY
METHANOL
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
PULSE TECHNIQUES
SPECTROSCOPY
STABILITY
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
WATER