Table 3.

Absorption and emission data for dihydroindenopyrone derivatives 2'a–d, 2''b–d and 3''b.

Compound	Excitation λ [nm]a	Emission λ [nm]a	Stokes shift [nm] / [ cm−1]	Emission λ [nm]b	Фc
2'a	313	382	69 / 5771	423	7.2%
2'b	316	389	73 / 5939	445	18.1%
2''b	320	393	73 / 5805	432	5.4%
3''b	317	390	73 / 5905	–	0.3%
2'c	315	386	71 / 5839	–	12.6%
2''c	288	338; 356; 370	68 / 6632	475	7.2%
2'd	313	385	72 / 5975	461	10.8%
2''d	321	389	68 / 5446	491	3.6%

^aRecorded in acetonitrile. ^bIn the solid state. ^cDetermined in acetonitrile with 9,10-diphenylanthracene as reference (Ф = 90%) [37].