Fig. 7. (a) Imine exchange 3 between between 1 and 4 in D2O : DMSO-d6 (9 : 1) as well as imine exchange 4 between 1 and 2a in D2O, with equilibrium constants listed. Optimized structures of 1focb and 2focb (b), as well as 1gocb and 2gocb (c), with distances (Å) and NBO energies (kcal mol−1) of n → π* interactions shown.
