Table 1. Successive (K₁ and K₂) and global (log β₂) binding constants determined from ¹H titrations of TK⁶⁺ with monovalent anions at room temperature in D₂O. Binding constants were deduced from ¹H chemical shifts measured as a function of anion concentration. H_j protons were monitored in all cases except the BF₄^– titration, for which the H_h protons were monitored. Standard deviations are shown in parentheses.

Anion	K 1 (M–1)	K 2 (M–1)	log β2	K 2/K1
Br–	4.4(0.5) × 102	2.3(0.3) × 103	6.0	5.2(0.8)
I–	6.5(0.6) × 102	2.2(0.3) × 103	6.15	3.3(0.6)
N3–	9.8(1.7) × 102	9.3(7.8) × 102	5.96	1.0(0.8)
SCN–	1.5(0.3) × 102	3.4(2.0) × 103	5.72	22.5(2.5)
NO3–	5.2(0.2) × 102	6.7(2.5) × 101	4.54	0.13(0.05)
BF4–	1.0(0.2) × 103	2.2(0.7) × 102	5.34	0.21(0.08)