Table 2. Absorption energies (E_abs) and oscillator strengths (f) calculated for 8.

Method	ε r b	E abs/λmax (eV/nm)	Character	f
			S 1
TD-DFT/B3LYP a	1(g.p)	3.433/361	π → π*	0.70
ADC(2) a	1	3.656/339	n → π*	2 × 10–3
	80	3.310/375	π → π*	0.87
			S 2
TD-DFT/B3LYP a	1(g.p)	3.716/334	n → π*	9 × 10–5
ADC(2) a	1	3.684/337	π → π*	0.85
	80	4.004/310	n → π*	0.02

^aEmploying def2-SVP basis set.

^bDielectric constant.