Table 4.

Solvent Dependent Absorption and Fluorescence Spectra

compound	solvent	${\lambda }_{\text{ab}}^{max}(\text{nm})$ a	εmax(M−1 cm−1)b	λex (nm)c	${\lambda }_{\mathrm{F}}^{max}(\text{nm})$ d	RQYe	SS (cm−1)f
external BN indole	cyclohexane	281.5	5 809	285	300	1.000	18.5
	diethyl ether	283.0	7 928	285	303	0.316	20.0
	dichloromethane	282.5	13 656	285	303	0.035	20.5
	chloroform	281.5	8 586	285	299	0.001	17.5
	acetonitrile	283.0	20 348	285	304	0.482	21.0
	dimethyl sulfoxide	286.0	3 698	285	309	0.116	23.0
fused BN indole	cyclohexane	295.0	13 105	295	341	1.000	46.0
	diethyl ether	298.5	58 080	303	358	0.680	59.5
	dichloromethane	296.0	21 810	295	363	0.582	67.0
	chloroform	290.5	50 300	295	367	0.005	76.5
	acetonitrile	297.5	42 008	295	370	0.686	72.5
	dimethyl sulfoxide	305.0	14 807	295	378	0.688	73.0

^aAbsorption maximum wavelength.

^bExtinction coefficient at absorption maximum.

^cExcitation wavelength for detection of fluorescence spectra.

^dFluorescence spectrum maximum wavelength.

^eRelative quantum yield.

^fStokes’ shift.