In water (Table 3), all used calculation methods indicate further
significant drop in IPs, PDEs and PAs. In the case of ETEs, IEF–PCM
predicts lower values in water (with exception of M05-2X value for
pyridoxamine). However, SMD gives lower ETEs in benzene. While
trends for studied molecules are in gas-phase and benzene identical,
in water the situation is slightly different. PDEs of pyridoxine
and pyridoxal have practically the same value. For used methods,
maximum difference is 5 kJ mol1. PA values for pyridoxal and
pyridoxic acid in Table 3 can also be considered identical. Moreover,
SMD calculations predict the same PAs for pyridoxine, too