The mole fraction of L1 in Co-1-k, x, was determined from the UV/vis absorption spectra in toluene. Co-1-k has two main absorption peaks at 490 and 550 nm, which are derived from L3 and L1, respectively. We assumed that the influence of L3 is negligible in the absorption at 550 nm, and that of L1 is sufficiently small at the 490-nm absorption. Dividing the absorbance at 550 nm by the molar extinction coefficient of corresponding mononuclear heteroleptic complex Mono-4 at 550 nm (1.0 × 105 M−1 cm−1) gave q1, the quantity of L1. That of L3, q3, can be also obtained in the same manner using the molar extinction coefficient of Mono-4 at 490 nm (1.1 × 105 M−1 cm−1). x was calculated using the following equationEmbedded Image(4)

Figure 2F shows the relationship between x and the mixing ratio of H2L1 to (H2L1 + H2L3) (r) in the wire formation reaction. The slope of the plot was calculated to be 0.84.

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