. Author manuscript; available in PMC: 2014 Apr 1.

Published in final edited form as: Inorg Chem. 2013 Mar 19;52(7):3597–3610. doi: 10.1021/ic300077g

Table 1.

Optical Properties of BF₂bdks 1-10 in CH₂Cl₂.^a

	λ_max/nm^b	ε/M⁻¹cm⁻¹^c	λ_em/nm^d	τ_F/ns^e	φ_F^g	τ_rad^h	Stokes Shift/cm⁻¹
1	330	31400	416	1.04^f	0.0031	--	--
2	365 380ⁱ	49200 42900ⁱ	417 396ⁱ	0.47	0.26	1.81	1060
3	376	37100			0.50	9.38
	(398)^a,ⁱ	(36300)ⁱ	(482)	(4.69)			(4380)
4	390	26900	417	too weak	0.30	35	1660
	(467)^a	(8100)	(596)	(10.5)			(4630)
5	360	39900	393	1.02	0.65	1.57	2330
6	397	57000	433	2.06	1.00	2.06	2090
7	415	66300	449	1.51	0.68	2.22	1820
8	404	29700	460ⁱ	1.96	0.49	21.4	2330
	(451)^a	(11700)	(572)	(10.5)			(4590)
9	411	73000	437	1.79	0.78	2.29	1450
10	344	34300			0.63	15.2
	(380)^a,ⁱ	(9900)	(459)	(9.55)			(4530)

Values in parentheses correspond to charge transfer processes.

Absorption maxima.

Extinction coefficients calculated at the absorption maxima.

Fluorescence emission maxima.

Fluorescence lifetime excited with a 369 nm LED monitored at the emission maxima. All fluorescence lifetimes are fitted with single-exponential decays unless indicated.

Possibly multi-exponential decay.

Relative quantum yield using anthracene in EtOH as a standard.

Radiative lifetime, where τ_rad =τ_F/φ_F.

ⁱ

Band is present as a shoulder or second maximum.