Table 1.
UV-Vis, Mössbauer, RR, and FTIR data for 1a·O2, [1a·O2]H+, 1b·O2, [1b·O2]H+, 2·O2, and [2·O2]H+.
| Complex | λmax, nm (ε, M−1 cm−1) |
δ, mm/s |
ΔEQ, mm/s |
ν (Fe–O), cm−1 (Δ18O) |
ν (O–O), cm−1 (Δ18O) |
νas(COO−) cm−1 (Δ13C) |
νs(COO−) cm−1 (Δ13C) |
Δνas-s cm−1 |
|---|---|---|---|---|---|---|---|---|
| 1a·O2 | 590 (3100) | 0.53(2) | 0.71(2) | 466/474 (−18) | 897 (−50) | 1607/1572 (>−22) | 1358 (−29) | >200 |
| [1a·O2]H+ | 600 (2360) | 0.53(2) | 0.80(2) | 467/478 (−20) | 896 (−53) | 1553 (−32) | - | - |
| 2·O2 | 600 (3300) | 0.53(2) | 0.77(2) | 466/475 (−18) | 897 (−50) | - | - | - |
| [2·O2]H+ | 610 (2700) | 0.54(2) | 0.84(2) | 478 (−19) | 897 (−50) | - | - | - |