Table 3. Binding constants obtained by fitting the changes in absorption, fluorescence and Eu(iii)-centred emission spectra of 1(S) or 1(R) upon addition of Eu(CF₃SO₃)₃ in CH₃CN solution (25 °C, 0.05 M (C₂H₅)₄NCl).

Compound	Absorption			Fluorescence			Eu(iii)-centred emission
	log β 1 : 1	log β 1 : 2	log β 1 : 3	log β 1 : 1	log β 1 : 2	log β 1 : 3	log β 1 : 1	log β 1 : 2	log β 1 : 3
1(S)	5.4 ± 0.3	11.1 ± 0.6	17.3 ± 0.4	6.2 ± 0.1	12.5 ± 0.2	17.9 ± 0.2	6.7 ± 0.2	—	17.4 ± 0.4
1(R)	5.7 ± 0.2	—	16.5 ± 0.5	6.2 (fix)	—	18.1 ± 0.2	6.9 ± 0.3	—	16.4 ± 0.4