Table 1 Photophysical properties of BF₂–smaragdyrins in different solvents.

	Solvent	λ_Soret (nm)	λ_Q-max (nm)	λ_em(nm)	E (eV)^a	Φ_f^b	Stokes shift (cm⁻¹)	k_r(s⁻¹)^d	k_nr(s⁻¹)^d
6a	Toluene	467	728	748	1.68	0.032	367	1.31 × 10⁸	3.97 × 10⁹
	THF	466	730	750	1.68	0.018	365	–	–
	Chloroform	468	731	752	1.67	0.019	382	–	–
	DCM	467	730	750	1.68	0.005	365	1.47 × 10⁸	2.93 × 10¹⁰
	BCN	470	729	747		0.003	331	1.58 × 10⁸	5.25 × 10¹⁰
	MeCN	463	727	746	1.68	<0.001	350	–	–
6b	Toluene	471	738	752	1.67	0.028	252	1.49 × 10⁸	5.17 × 10⁹
	THF	470	742	758	1.65	0.025	284	–	–
	Chloroform	471	742	757	1.66	0.015	267	–	–
	DCM	468	739	757	1.66	0.005	322	1.85 × 10⁸	3.69 × 10¹⁰
	BCN	468	737	772		0.002	615	1.33 × 10⁸	6.65 × 10¹⁰
	MeCN	464	737	750	1.67	<0.001	235	–	–
6c	Toluene	466	726	740	1.69	0.079	261	3.50 × 10⁸	4.08 × 10⁹
	THF	465	730	742	1.69	0.043	222	–	–
	Chloroform	467	730	744	1.68	0.047	258	–	–
	DCM	466	729	743	1.69	0.018	258	4.39 × 10⁸	2.40 × 10¹⁰
	BCN	465	729	753		0.010	437	2.70 × 10⁸	2.68 × 10¹⁰
	MeCN	462	726	737	1.70	0.013	206	–	–
6d	Toluene	464	721	738	1.70	0.054	319	2.30 × 10⁸	4.03 × 10⁹
	THF	463	723	739	1.70	0.041	299	–	–
	Chloroform	464	723	739	1.70	0.037	299	–	–
	DCM	463	723	740	1.70	0.028	318	1.88 × 10⁸	6.53 × 10⁹
	BCN	466	725	751		0.017	478	1.73 × 10⁸	1.00 × 10¹⁰
	MeCN	459	720	737	1.70	0.017	320	–	–
11	Toluene	454, 476	702	715	1.75	0.138	259	–	–
	THF	452, 475	702	718	1.75	0.150	317	–	–
	Chloroform	454, 476	704	717	1.75	0.109	258	–	–
	DCM	453, 475	702	717	1.75	0.117	298	–	–
	MeCN	448, 471	700	714	1.75	0.192	280	–	–
12	Toluene	480	762	816	1.57	<0.001	868	–	–
	THF	478	766	–^c	–	–^c	–	–	–
	Chloroform	479	770	–^c	–	–^c	–	–	–
	DCM	478	768	819	–	<0.001	811	–	–
	BCN	480	771	842		<0.001	1094	–	–

^aExcitation energy of S₁-state determined by the midpoint of the absorption spectrum and the fluorescence spectrum.
^bFluorescence quantum yield.
^cFluorescence quantum yield is too low to be accurately determined.
^dThe rates of radiative and non-radiative decay.

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