Table 1. Photophysical and Electrochemical Data: Summary of the Photophysical and Redox Properties of the Cu(I) PSsa.
| Cu PS | Ered (V) | λem (nm) | λab (nm) | ε405 (M–1 cm–1) | Φembc | τb (ns) | kr (103 s–1)d | knr (106 s–1)e | isosbestic point (nm)f | E0–0 (eV)f | Ered,ex (V) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| CuBCP | –2.04 | 580 | 285, 388 | 1760 | 0.23% ± 0.02% | 289 ± 5 | 8.0 | 3.5 | 445 | 2.79 | 0.75 |
| CuPBCP | –1.88 | 590 | 281, 395 | 3070 | 0.03% ± 0.01% | 33.0 ± 3.1; τ1 = 3.5, 33%; τ2 = 48.4, 67% | 9.1 | 30.3 | 430 | 2.88 | 1.00 |
| CuPPBCP | –1.97 | 590 | 289, 389 | 4000 | 0.16% ± 0.02% | 206 ± 4 | 7.8 | 4.8 | 446 | 2.78 | 0.81 |
a
Measured in in deaerated CH3CN solution at 298 K. Experimental error within 5%. Potentials are versus Fc+/0.
b
Excited at 405 nm. The error bars represent the standard deviations of three independent measurements.
c
Determined via the relative method with RuBPY (= Ru(bpy)3(PF6)2; bpy = 2,2′-bipyridine) as the standard, 0.095% at 298 K.44
d
kr = Φem/τ.45
e
knr= (1 – Φem)/τ.45
f
Isosbestic point was obtained from the intersection of normalized absorption and emission spectra and E0–0 values = 1240/isosbestic point (eV).45