Table 1.

Linear photophysical and photochemical parameters of 1 in organic solvents of different polarity Δf ^*: absorption ${\lambda }_{\mathit{abs}}^{max}$ and fluorescence ${\lambda }_{fl}^{max}$ maxima, Stokes shifts, maximum extinction coefficients ε^max, fluorescence quantum yields Φ and lifetimes τ, quantum yields of photochemical decomposition under one-photon irradiation Φ_1PA.

N/N	Toluene	THF	DCM	DMSO	ACN
Δf	0.0135	0.209	0.217	0.263	0.305
${\lambda }_{\mathit{abs}}^{max}$, nm	391 ± 1	391 ± 1	386 ± 1	391 ± 1	382 ± 1
${\lambda }_{fl}^{max}$, nm	473 ± 1	496 ± 1	504 ± 1	548 ± 1	517 ± 1
Stokes shift, cm−1	4430 ± 100	5410 ± 100	6070 ± 100	7330 ± 100	6840 ± 100
εmax ·10−3, M−1·cm−1	-	61 ± 3	59 ± 3	58 ± 3	56 ± 3
Φ	0.72 ± 0.04	0.83 ± 0.05	0.94 ± 0.05	0.54 ± 0.03	0.78 ± 0.04
τ, ns**	1.08 ± 0.08	1.44 ± 0.08	1.45 ± 0.08	1.59 ± 0.08	1.63 ± 0.08
Φ1PA ·104	-	1.6 ± 0.4	2.0 ± 0.4	1.0 ± 0.3	6.3 ± 2

^*orientation polarizability Δ f = (ε − 1)/(2ε +1) − (n² − 1)/(2n² +1) (ε and n are the dielectric constant and refraction index of the medium, respectively).³¹

^**All lifetime measurements correspond to goodness-of-fit parameters χ² ≥ 0.99.