. 2022 Jun 22;7(26):22244–22255. doi: 10.1021/acsomega.2c00935

v) at 298 K.

	[R + Li⁺]				[R + Na⁺]				[R + K⁺]
receptor	log K₁₁	log K₁₂	log β	CF^c	log K₁₁	log K₁₂	log β	CF^c	log K₁₁	log K₁₂	log β	CF^c
R1	4.44	3.82	8.26	52	4.29	3.77	8.05	32	4.51	3.86	8.37	68
R2	4.61	4.39	9.00	155	4.73	4.37	9.10	195	4.66	4.30	8.96	141
R3	4.39	3.68	8.06	69	4.51	3.96	8.47	178	4.62	3.95	8.56	219

Error less than 10%.

The acetate anion was added as its tetrabutylammonium salt.

The cooperativity factor in this case is given by CF = β(M⁺)/β(none) where β(M^–2) is the overall constant in the presence (β(M⁺)) or absence (β(none)) of alkali metal cation.

Table 2. Logarithm of Apparent Binding Constants (log Ka) for Complexes between Receptors R1–R3 and OAc– b in the Presence of 1 equiv of Alkali Perchlorate Salt Obtained by Fluorescence, in MeCN/DMSO 9:1 (v/v) at 298 K.

Table 2. Logarithm of Apparent Binding Constants (log K^a) for Complexes between Receptors R1–R3 and OAc^–^b in the Presence of 1 equiv of Alkali Perchlorate Salt Obtained by Fluorescence, in MeCN/DMSO 9:1 (v/v) at 298 K.