Fig. 5: Bond length analysis of mixed-stack complexes.

a Bond labels of 2O, 2S, F₄, and F₂. b–g Comparison of C–C and C–S bond lengths (d_CC and d_CS, respectively) of donors and acceptors in single crystals of mixed-stack complexes, with error bars (standard deviation). The letters along the x-axes of the plots correspond to the bonds depicted in a. As a reference, the bond lengths in single crystals of neutral donors or acceptors (i.e., δ = 0) are shown with dotted lines and 1e⁻-oxidized donors or 1e⁻-reduced acceptors (i.e., δ = 1) are shown with solid lines. Observed d_CC of 2O³⁰ (b), d_CC of 2S (c), d_CC of F₄^33,35 (d), d_CS of 2O³⁰ (e), d_CS of 2S (f), and d_CC of F₂^34,36 (g). i = (i¹ + i²)/2.