Table 1.

Stability constants log K _a of the complexes of selected aCB derivatives and their corresponding guests.

Receptor	log K a values of complexes with[a]
	9	10	11	6
7  d [b]	4.4	6.3	8.0	6.9
7  f [b]	5.4	6.5	9.8	8.8
8  a [c]	5.2	6.3	n.a.[d]	9.0
8  b [c]	5.3	6.4	n.a.	9.8
8  c [c]	4.8	6.0	n.a.	9.1

[a] 20 mM Aqueous phosphate buffer, pH 7.4, 25 °C; [b] from Ref. [68]; [c] from Ref. [67]; [d] n.a. – not available.