Table 2.
Extraction of FITC-choline 9 with cavitands 1–3 in the presence of base.
| Hosta | Guest 9 concentration [μm] | Extraction [%] | Extraction (control) [%] | Extraction efficiency [%]b |
|---|---|---|---|---|
| 1 | 10 | 14.7 | 2.4 | 1.2 |
| 25 | 13.3 | 0.9 | 3.1 | |
| 50 | 9.9 | 1.7 | 4.0 | |
| 100 | 7.4 | 0.0 | 7.4 | |
| 200 | 3.8 | 0.2 | 7.3 | |
| 2 | 10 | 17.0 | 0.0 | 1.7 |
| 25 | 13.3 | 2.2 | 2.8 | |
| 50 | 6.4 | 1.8 | 2.2 | |
| 100 | 6.9 | 3.0 | 3.9 | |
| 200 | 1.7 | 1.5 | 0.3 | |
| 3 | 10 | 0.0 | 0.0 | 0 |
| 25 | 1.4 | 2.1 | 0 | |
| 50 | 0.7 | 1.8 | 0 | |
| 100 | 2.0 | 3.0 | 0 | |
| 200 | 3.7 | 1.5 | 4.0 |
a
Resorcinarene-based receptors (100 μm) in CH2Cl2; guest 9 was dissolved in water containing 10% (v/v) NaOH (1 m), stirred for 24 h at 160 rpm. The resulting aqueous phase was measured using a UV/Vis calibration curve after dilution. See Exp. Sect. for full details.
b
Calculated as (extraction – extraction control) × [guest]/[host].