Binding affinities of tweezers Z-3 and Z-4 measured in chlorinated solvents via¹H NMR titration experiments.

Guest	Z-3	Z-4
DTF (5)	2380 (253 K, CDCl3)	4140 (253 K, CDCl3)
		1830 (273 K, CDCl3)
		1090 ± 70 (293 K, CDCl3)a
TCNB (6)	10 ± 1.5 (293 K, CD2Cl2)a	26 ± 0.6 (293 K, CD2Cl2)a
PhA (7)	16 ± 1.3 (293 K, CDCl3)a	35 ± 4.7 (293 K), CDCl3a
3NPN (8)	18 ± 1.6 (293 K, CD2Cl2)a	23 ± 0.04 (293 K, CD2Cl2)a

^aAverage values obtained from two independent titration experiments with error margins given.