Table 1.

Binding constants of L for anions (A) in DMSO-d ₆ ^a.

Anions	Log K 1 (or Log β 1)	Log K 2	Log β 2 (β 2 = K 1 K 2)
SO4 2−	3.07(3)	2.56(4)	5.63(4)
HSO4 −	2.41(5)	1.65(5)	4.06(5)
H2PO4 −	2.06(5)	1.75(3)	3.81(5)
ClO4 −	<1	<1	<1
NO3 −	<1	<1	<1

^aThe binding constants were determined using a 1:2 binding model for the following reaction: $\mathbf{L}+\mathrm{A}\stackrel{K_1}{\rightleftharpoons }\left[\mathbf{L}\mathrm{A}\right]\underset{A}{\overset{K_2}{\rightleftharpoons }}\left[\mathbf{L}{\mathrm{A}}_2\right]$.