β-Phosphorus hyperfine coupling constant in nitroxides: 5. Solvent effect

Recently, we published the titration of water in organic solvents and conversely using this family of nitroxides (Org. Biomol. Chem. 2015 ASAP). In this article, we show that the aβ,P of persistent cyclic β-phosphorylated nitroxides decreases with the normalized polarity Reichardt's constant ENT. Koppel–Palm and Kalmet–Abboud–Taft relationships were applied to get a deeper insight into the effects influencing aN and aβ,P: polarity/polarizability, hydrogen bond donor property, and structuredness of the cybotactic region.