Table 1. Binding parameters for hosts 1^tBu and 2^CF₃ with the anions used in this study ^a .

Host	Solvent	HSe–		Br–		HS–		Cl–
		K a (M–1)	ΔG (kcal mol–1)	K a (M–1)	ΔG (kcal mol–1)	K a (M–1)	ΔG (kcal mol–1)	K a (M–1)	ΔG (kcal mol–1)
1tBu	10% DMSO-d6/CD3CN	460 ± 50	–3.63 ± 0.06	110 ± 20	–2.79 ± 0.09	3600 ± 500	–4.85 ± 0.09	1700 ± 200	–4.41 ± 0.06
2CF3	CD3CN	290 ± 50	–3.35 ± 0.10	67 ± 7	–2.49 ± 0.06	840 ± 80	–3.93 ± 0.06	430 ± 50	–3.59 ± 0.07

^aThe minimum error is assumed to be 10% in cases where the standard deviation is less than 10%.