## Wikipedia - Alfa (pl) Wikipedia - Beta (pl) Wikipedia - نظرية برونستد-لوري (ar) Brønsted relation

https://doi.org/10.1351/goldbook.B00746
The term applies to either of the equations: $\frac{k_{\text{HA}}}{p} = G\left ( \frac{q\ K_{\text{HA}}}{p} \right )^{\alpha}$ $\frac{k_{\text{A}}}{q} = G\left ( \frac{q\ K_{\text{HA}}}{p} \right )^{-\beta}$ (or their logarithmic forms) where $$\alpha$$, $$\beta$$ and $$G$$ are constants for a given reaction series ($$\alpha$$ and $$\beta$$ are called 'Brønsted exponents'), $$k_{\text{HA}}$$ and $$k_{\text{A}}$$ are @[email protected] (or rate coefficients) of reactions whose rates depend on the concentrations of HA and/or of A. $$K_{\text{HA}}$$ is the acid @[email protected] constant of the acid HA, $$p$$ is the number of equivalent acidic protons in the acid HA, and $$q$$ is the number of equivalent basic sites in its conjugate base A. The chosen values of $$p$$ and $$q$$ should always be specified. (The charge designations of H and A are only illustrative.) The Brønsted relation is often termed the 'Brønsted @[email protected]' (or the '@[email protected]'). Although justifiable on historical grounds, this name is not recommended, since Brønsted relations are known to apply to many uncatalysed and pseudo-catalysed reactions (such as simple @[email protected]). The term 'pseudo-Brønsted relation' is sometimes used for reactions which involve @[email protected] instead of acid–base @[email protected] Various types of Brønsted parameters have been proposed such as $$\beta_{\text{lg}}$$, $$\beta_{\text{nuc}}$$, $$\beta_{\text{eq}}$$ for @[email protected], nucleophile and equilibrium constants, respectively.
See also:
linear free-energy relation
Sources:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1091 [Terms] [Paper]
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 154 [Terms] [Paper]