## compensation effect

https://doi.org/10.1351/goldbook.C01197
In a considerable number of cases plots of $$T\ \Delta ^{\ddagger }S$$ vs. $$\Delta ^{\ddagger}H$$, for a series of reactions, e.g. for a reaction in a range of different solvents, are straight lines of approximately unit slope. Therefore, the terms $$\Delta ^{\ddagger}H$$ and $$T\ \Delta ^{\ddagger }S$$ in the expression partially compensate, and $\Delta ^{\ddagger}G = \Delta ^{\ddagger}H - T\ \Delta ^{\ddagger}S$ often is a much simpler function of solvent (or other) variation than $$\Delta ^{\ddagger}H$$ or $$T\ \Delta ^{\ddagger }S$$ separately.
See also:
isokinetic relationship
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1098 [Terms] [Paper]