Table 1.

Names, structures, and photophysical parameters of various DCDHFs and standard fluorophores. The structures are generalized: the methyl groups on the amine and dihydofuran ring may vary in length and composition; the data presented is representative of chromophores with varying R₁–R₄ groups, because varying the length of the alkyl chains has little effect on the photophysics. See text for details on photophysical parameters. (Data from refs. [19,20], and [24].)

Compound	Structure	εmax [m−1 cm−1][a]	λabs [nm][a]	λem [nm][a]	ΦF in toluene {PMMA}	ΦB in gelatin {PMMA} (× 10−6)	Ntot,e in PMMA (× 106)
DCDHF-P		71 000	486	505	0.044 {0.92}	6.6	2.4
DCDHF-P with 1 constraining ring		95 900[b]	495	515	0.10
DCDHF-P with 2 constraining rings		90 400[b]	503	527	0.21		1.1
DCDHF-V-P		45 500	562	603	0.02 {0.39}	2.8	∼1.9
DCDHF-T		100 000	514	528	0.11		∼0.91
DCDHF-V-T		114 000	614	646	0.02		∼0.23
DCDHF-N		42 000	526	579	0.85 {0.98}	3.4	1.1
DCDHF-V-N		58 100[b]	574	671	0.01
DCDHF-V-(1,4)N		22 200[b]	538	661	0.01
DCDHF-A		35 000	585	689	0.54	1.7	2.2
DCDHF-P-P		31 000	506	623	0.82		4.5
DCDHF-T-T		71 800	634	679	0.50	{2.1}
DCDHF-V-T-T		49 800	708	779	0.13	{3.4}
DCDHF-P-T		44 000	591	663	0.21		6.4
DCDHF-T-P		22 000	575	631	0.74		2.9
DCDHF-V-T-P		47 300	611	723	0.07	{0.13}
DCDHF-P-T-P		28 000	541	709	0.34		0.91
Rhodamine 6G		105 000[c]	530[c]	556[c]	0.95[c]	3.5	1.4
Fluorescein		92 300[c]	483[c]	515[c]	0.79[c]	64

^[a]In toluene.

^[b]In dichloromethane.

^[c]In ethanol.