Table 2. Ground-State and Excited-State Parameters for Molecules M = Cu1, [Cu(dipp)₂]⁺ and [Cu(dtbp)₂]^+a.

M	λabs/nm (ε/M–1·cm–1)	E(M+/M) (V)b	E(M/M–) (V)c	λem/nm (Φ/%)b	E(M*/M–)d	τ/nsb	kr/s–1e	knr/s–1e
Cu1	438 (4460)	0.60 (120)	–2.13 (100)	678 (0.17)	0.01	127	1.34 × 104	7.86 × 106
[Cu(dipp)2]+	453 (7260)	0.65	–2.10	679 (0.4)	0.03	342	1.1 × 104	2.73 × 106
[Cu(dtbp)2]+, 8	425 (3100)			599 (5.6)		3260	1.72 × 104	0.3 × 106

^aMeasurements are performed in DCM unless otherwise mentioned.

^bDegassed medium.

^cIn degassed DMF.

^dEstimated using the Rehm and Weller equation. Potentials given vs Fc⁺/Fc couple.

^ek_r = Φ/τ and k_nr = 1/τ – k_r.