Table 1.
Summary of photophysical parameters for homometallic and heterobimetallic complexes in this study
| Complex | ε, M−1⋅cm−1 | ΦPL, % | τ, μs |
| [Au (μ-C2, N3-MeIm)]3 | 4,800 | 56.88 ± 3.58 | 11.5 (298 K) 34.6 and 15.4 (77 K) |
| Au (μ-C2, N3-BzIm)]3 | 7,880 | N/A | N/A |
| [Cu(μ-3,5-(CF3)2Pz)]3 | 2,600 | 82.17 ± 0.16 | N/A |
| [Au2(μ-C2,N3-BzIm)2Cu(µ-3,5-(CF3)2Pz)] (1) | 11,560 | 85.16 ± 1.57 | 12.2 (298 K) 47.0 and 38.3 (77 K) |
| [Au2(μ-C2,N3-MeIm)2Cu(µ-3,5-(CF3)2Pz)] (3a) | 20,590 | 97.13 ± 0.80 | 12.3 (298 K) 10.8 and 11.2 (77 K) |
| [Au(μ-C2,N3-MeIm)Cu2(µ-3,5-(CF3)2Pz)2] (3b) | 2,850 | 17.51 ± 0.25 | 26.2 and 4.88 (298 K) and 179.7 and 95.7 (77 K) |
| {Au(μ-C2,N3-BzIm)}3{Cu(µ-3,5-(CF3)2Pz)}3 (2) | N/A | N/A | 61.5 and 22.5 (77 K) |
| [Au4(μ-C2,N3-EtIm)4Cu2(µ-3,5-(CF3)2Pz)2] (4a) | 17,260 | 90.31 ± 0.70 | 6.92 (298 K) and 6.57 (77 K) |
| [Au(μ-C2,N3-EtIm)]3 | 3,950 | N/A | 11.8 (298 K) and 59.8 (77 K) |
ε , extinction coefficient at 268 nm for dilute (ca. 0.1 μM) solutions; ΦPL, photoluminescence quantum yield in the solid-state powder form; and τ, photoluminescence lifetime at the characteristic λmax. Some entries are designated with “N/A” for “not applicable” because the emission is too weak to measure its lifetime or quantum yield, or the extinction coefficient could not be measured in solution due to lack of solubility.