Bridged Phthalocyanine Systems for Sensitization of Nanocrystalline TiO₂ Films

Table 1

Experimental Spectral and Electrochemical data of I–III dyes.

dye	Absmax^a[nm]	Emmax^a[nm]	E(S^+/S)^b[V] versus SCE	E(0-0)^c[V] (Abs/Em)	E(S^+/S^∗)^d[V] versus SCE
(I) +1-Methylimidazole	621	696	0.434	1.88	−1.45
(II)	632	702	0.419	1.86	−1.44
(II) + 1-Methylimidazole	620	702	0.328	1.87	−1.54
(III)	637	702	0.387	1.86	−1.47
(III) + 1-Methylimidazole	627	702	0.383	1.86	−1.48

aAbsorption and emission spectra in CH₂Cl₂ solution. bGround state oxidation potential versus SCE. c0-0 transition energy estimated from the intercept of the normalized absorption and emission spectra. dEstimated LUMO energies from the estimated HOMO energies (ground state oxidation potential) and the 0-0 transition energies.