Table 2. Calculated (B3LYP) Values of Electronic Transition Energies (E_abs and E_em), Oscillator Strengths (f), and Dipole Moments of Conjoined Coumarins in Toluene: μ_g in the Ground State (S₀) and μ_e in the Excited (S₁) State^a.

	S0 state			S1 state			S1 vs S0
comp.	Eabs [nm]	f	|μg| [D]	Eem [nm]	f	|μe| [D]	α [deg]	|μe| – |μg| [D]	|μe – μg| [D]
3	412.5	0.8229	14.85	451.9	0.5716	19.32	29.9	4.47	3.52
5	425.8	0.7251	14.97	478.6	0.4891	19.48	30.5	4.51	2.65
7	458.3	0.0650	10.37
8	442.1	0.2241	14.65	597.7	0.1038	19.24	30.0	4.59	3.76
10	476.1	0.5061	16.16	542.7	0.3056	24.17	33.5	8.01	3.40
11	475.7	0.5629	16.10	539.0	0.3311	23.90	33.3	7.80	3.82
12	472.5	0.4919	16.29	543.4	0.2879	24.18	32.7	8.17	3.90
13	473.6	0.4783	16.54	545.1	0.2809	24.45	32.1	7.91	3.88
15	454.6	0.4179	14.03	583.8	0.2165	19.94	30.9	5.91	3.00
16	424.4	0.4085	14.13	547.2	0.1994	19.12	29.6	4.99	3.28
17	430.9	0.3985	14.41	554.9	0.1979	19.33	28.5	4.93	3.37
18	418.0	0.5089	12.94
19	405.3	0.5723	13.51	459.3	0.3772	19.51	38.1	6.00	3.38
20	399.7	0.1303	12.26	511.8	0.0705	15.91	37.7	3.65	3.23

^aα is the angle between μ_g and μ_e; |μ_e| – |μ_g| is the difference in scalar values of dipole moments; |μ_e – μ_g| is the value of the vector difference between both vectors—this is the factor that determines the size of the solvatochromic effect, as it is known from the theory of the Lippert–Mataga solvent effect.⁴² Lippert–Mataga expressions are recalled in the Supporting Information.