Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2012 Oct 11;109(45):18453–18458. doi: 10.1073/pnas.1208771109

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

PMC Copyright notice

Fig. 5. — The van’t Hoff plots of the temperature dependence of the equilibrium constant are very sensitive to a particular interaction responsible for the depth of potential wells shown in Fig. 4. The dash-dotted line shows calculated according to Eq. 12 with the temperature-independent potential well depth = 13 using = 20 °C as the reference temperature, indicated by the vertical dashed line. In the case of Coulomb interactions, the temperature dependence of the dielectric constant may significantly compensate the van’t Hoff slope and even lead to its inversion, staying approximately linear in this temperature range. This is illustrated by the solid curve calculated according to Eqs. 15–17, as explained in the text. Temperature dependence of van der Waals (vdW) forces may induce slope corrections in the same direction, whereas in the case of hydrogen bonding the slope of the temperature dependence is expected to increase (arrows around the dash-dotted line).

Inline graphic — The van’t Hoff plots of the temperature dependence of the equilibrium constant are very sensitive to a particular interaction responsible for the depth of potential wells shown in Fig. 4. The dash-dotted line shows calculated according to Eq. 12 with the temperature-independent potential well depth = 13 using = 20 °C as the reference temperature, indicated by the vertical dashed line. In the case of Coulomb interactions, the temperature dependence of the dielectric constant may significantly compensate the van’t Hoff slope and even lead to its inversion, staying approximately linear in this temperature range. This is illustrated by the solid curve calculated according to Eqs. 15–17, as explained in the text. Temperature dependence of van der Waals (vdW) forces may induce slope corrections in the same direction, whereas in the case of hydrogen bonding the slope of the temperature dependence is expected to increase (arrows around the dash-dotted line).