Table 2.

Photophysical properties of reference compounds in 1:1 ethanol/CH₂Cl₂

cmpd	baseb	λabs (nm)/ε × 10−4	λem (nm)	fwhm (nm)	φa
11	−	560/2.6	587	41	0.72
11	+	559/2.6	587	41	0.71
12	−	565/0.9	593	46	0.46
12	+	563/1.0	592	43	0.61
13	−	574/3.2	606	44	0.52
13	+	574/3.2	605	53	0.54
14	−	573/2.3	612	53	0.42
14	+	578/2.5	613	52	0.44
E	−	506/8.7	511	16	0.98
E	+	506/8.7	511	17	0.90
F	−	508/7.4	517	26	0.76
F	+	508/11	517	25	0.95

Absorption data recorded at 1 × 10⁻⁵ M. Emission data taken at 1 × 10⁻⁶ M.

^aRhodamine 101 (φ = 1.0 in ethanol)³⁵ was the standard for 11 – 14 and fluorescein (φ = 0.92 in 0.1 M NaOH)³⁴ for E and F.

^bwithBu₄NOH at a concentration of 8 × 10⁻⁵ M.