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Gas-phase Acidities and O-H Bond Dissociation Enthalpies of Phenol, 3-methylphenol, 2,4,6-trimethylphenol, and Ethanoic Acid

Gas-phase Acidities and O-H Bond Dissociation Enthalpies of Phenol, 3-methylphenol, 2,4,6-trimethylphenol, and Ethanoic Acid

Laurence A Angel, Kent M Ervin

J Phys Chem A. 2006 Sep 7;110(35):10392-403.

PMID: 16942044

Abstract:

Energy-resolved, competitive threshold collision-induced dissociation (TCID) methods are used to measure the gas-phase acidities of phenol, 3-methylphenol, 2,4,6-trimethylphenol, and ethanoic acid relative to hydrogen cyanide, hydrogen sulfide, and the hydroperoxyl radical using guided ion beam tandem mass spectrometry. The gas-phase acidities of Delta(acid)H298(C6H5OH) = 1456 +/- 4 kJ/mol, Delta(acid)H298(3-CH3C6H4OH) = 1457 +/- 5 kJ/mol, Delta(acid)H298(2,4,6-(CH3)3C6H2OH) = 1456 +/- 4 kJ/mol, and Delta(acid)H298(CH3COOH) = 1457 +/- 6 kJ/mol are determined. The O-H bond dissociation enthalpy of D298(C6H5O-H) = 361 +/- 4 kJ/mol is derived using the previously published experimental electron affinity for C6H5O, and thermochemical values for the other species are reported. A comparison of the new TCID values with both experimental and theoretical values from the literature is presented.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP527606	2,4,6-Trimethylphenol		527-60-6	Price

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