“…Additionally, three basis sets LANL2DZ for Ru, double-ζ, and 6-311+G(2d,p) for C, N, S, O, and H elements ,,, were implemented. It has been reported that M06 has appropriate ability to study characteristics of organometallic compounds. ,,, The calculated HOMO–LUMO gap value from M06 functional shows a variation of less than 0.05 eV on average for neutral N719 derivatives. For dianionic derivatives, a variation of 0.06 eV (on average) was obtained when different basis sets were employed (for neutral and derivative complexes).…”