IUPAC - Bunnett–Olsen equations (B00758)

Bunnett–Olsen equations

https://doi.org/10.1351/goldbook.B00758

The equations for the relation between

\log_{10} (\frac{{[SH}^{+}]}{[S]}) + H_{0}

and

\log_{10} {[H}^{+}] + H_{0}

for base S in aqueous mineral acid solution, where

H_{0}

is Hammett's acidity function and

\log_{10} {[H}^{+}] + H_{0}

represents the activity function

\frac{\log_{10} (γ_{S} γ_{H^{+}})}{γ_{{SH}^{+}}}

for the nitroaniline reference bases to build

H_{0}

\log_{10} (\frac{[{SH}^{+}]}{[S]}) - \log_{10} [H^{+}] = (Φ - 1) (\log_{10} {[H}^{+}] + H_{0}) + p K_{{SH}^{+}}

\log_{10} (\frac{[{SH}^{+}]}{[S]}) + H_{0} = Φ (\log_{10} [H^{+}] + H_{0}) + p K_{{SH}^{+}}

See also: Cox–Yates equation

Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1091 [Terms] [Paper]

Citation: 'Bunnett–Olsen equations' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.B00758 RIS BibTex EndNote

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Last revised: February 24, 2014

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Bunnett–Olsen equations