Table 2. Theoretical results for HBO dyes in cyclohexane. Top: relative Gibbs energy differences with respect to the non-substituted HBO, in eV, a negative value indicating that substitution relatively favours the K* form (see Table S2 in the ESI for that can be obtained by adding –0.314 eV to the value reported here). Bottom: E*/K* emission wavelengths (λE*fl/λK*fl in nm) for the tautomers that is (are) predicted to be present. The background colour indicates the predicted emission based on the : red/green/white background corresponding to sole K*/sole E*/dual fluorescence.