Table 1.

Summary of the photophysical and electrochemical properties of biipo, Rubiipo, and of selected reference compounds in acetonitrile solution at room temperature. The electrochemical data were obtained from deaerated acetonitrile solutions at room temperature and are referenced versus the ferrocene/ferricenium (Fc/Fc⁺) couple.

Compound	λ abs,max [nm] (ϵ [103  m −1 cm−1])	λ em [nm] inert	ϕem inert	ϕem O2	τ em [ns] inert	τ em [ns] O2	E 1/2ox [V]	E 1/2red [V]
biipo	409 (6.2)	540	0.258	0.428	<10[b]	<10[b]	–	−1.59, −2.29[c]
phen [a]	265 (32.0)	365	<0.01
Rubiipo	411 (26.3), 460 (24.7)	623	0.022	0.006	1668, 24 717	222	+0.80	−1.44, −1.86 −2.04, −2.21[c], −2.31
Ruphen [a]	426 (16), 455 (19)	602	0.03	–	272	–	+0.79	−1.79, −1.99, −2.26

[a] Taken from reference [57]; [b] the lifetime was below the detection limit; [c] irreversible redox event.