Table 1: Absorption, luminescence, and electrochemical properties of the ruthenium complexes.

SensitizerAbsorption,aλ max/nm (ε/103 M-1 cm-1)Emission λ maxb/nmEmission τ b/nsE (Ru3+/2+)c / versus SCEE* (Ru3+/2+)d/ versus SCE
298 K77 K298 K77 K

A1280 (27.6), 331 (22.7), 422 (14.7), 606 (7.0)94090516160+0.68−0.90
A2280 (28.2), 331 (23.1), 418 (13.6), 605 (7.1)94590015214+0.70−0.95
A3280 (30.0), 331 (23.6), 422 (14.7), 606 (7.0)95091016152+0.70−0.95

aMeasured in 4 : 1 v/v ethanol : methanol at room temperature.
bThe emission spectra and emission lifetime were obtained by exciting into the lowest MLCT band in 4 : 1 v/v ethanol : methanol.
cHalf-wave potentials assigned to the Ru3+/2+ couple for ruthenium sensitizers bound to nanocrystalline TiO2 film, measured in 0.1 M LiClO4 acetonitrile solution.
dCalculated from E* (Ru3+/2+) = E (Ru3+/2+) − E 0-0; E 0-0 values were estimated from the 5% intensity level of the emission spectra at 77 K.