Table 1. Association Constants (K_a) for Binding of Dodecaborate Anions to γ-CD, δ-CD, or ε-CD^a.

	Ka (M–1) for dodecaborate guestsb
Host		B12Cl122–	B12Br122–	B12I122–
γ-CD	Ka (1:1)	2.6 × 104	5.5 × 104	2.4 × 105
	Ka (2:1)	1.9 × 104	2.1 × 106	2.1 × 104
δ-CDc	Ka (1:1)	8.7 × 106	1.2 × 107	9.2 × 105
ε-CD	Ka (1:1)	2.7 × 104	2.3 × 105	3.4 × 106c

^aDetermined by ¹H NMR spectroscopy titration in D₂O, unless stated otherwise. Uncertainties on the fits are given in Section S9.

^bAll as their disodium salts.

^cDetermined by ITC in H₂O.