Isotope effects on chemical equilibria. Part 1. Some secondary isotope effects of the second kind

Journal Article · Thu Feb 01 04:00:00 EST 1973 · Can. J. Chem., v. 51, no. 3, pp. 411-421

DOI:https://doi.org/10.1139/v73-061· OSTI ID:4440871

Barnes, D J; Scott, J M.W.

Secondary isotope effects K/sub a/(H)/K/sub a/(D) for the isotopic acid pairs 4-X-C/sub 6/H/sub 4/CH/sub 2/COOH/4-X- C/sub 6/H/sub 4/-CD/sub 2/COOH(X = H, NO/sub 2/, OMe) were determined at T = 25 deg C by conductance measurements. This has involved the redetermination of the dissociation constants for the nondeuterated acids and in the case of X = NO/sub 2/, OCH/sub 3/, the new K/ sub a/ values are to be preferred. The K/ sub a/ of aceti c acid was also redetermined as a check on the reliability of the new data. The three isotope effects are shown to be much small than might have been anticipated on the basis of the emf measur ments on the pair PHCH/sub 2/COOH/PhCD/sub 2/COOH. (auth)

• Research Organization: Memorial Univ. of Newfoundland, St. John's
• NSA Number: NSA-29-000134
• OSTI ID: 4440871
• Journal Information: Can. J. Chem., v. 51, no. 3, pp. 411-421, Journal Name: Can. J. Chem., v. 51, no. 3, pp. 411-421; ISSN CJCHA
• Country of Publication: Canada
• Language: English

Related Subjects

*DEUTERIUM-- ISOTOPE EFFECTS
CHEMICAL REACTIONS
ELECTRIC CONDUCTIVITY
ETHERS
MONOCARBOXYLIC ACIDS
N40220* --Chemistry--Inorganic
Organic
& Physical Chemistry--Isotopic Effects
NITRO COMPOUNDS