Table 1 Anion association constants (Ka, in M−1) for tri- and tetradentate [2]rotaxanes with TBA halide salts in acetone-d6 or 2% D2O/acetone-d6 determined by 1H NMR titrationsa
From: Amphoteric chalcogen-bonding and halogen-bonding rotaxanes for anion or cation recognition
Acetone-d6 | 2% D2O/acetone-d6 | |||
|---|---|---|---|---|
[2]Rotaxane | Cl− | Br− | I− | Cl− |
10·XB3 | >105 | / | / | / |
8·XB2ChBMe | 4,090 (351) | 2,330 (41) | 977 (24) | 89 (1) |
10·XB2HB | 4,380 (322) | 2,140 (68) | 902 (57) | / |
8·ChB3 | 130 (1) | 80 (1) | 46 (<1) | / |
10·ChB2HB | 127 (2) | 110 (2) | 34 (3) | / |
10·HB3 | 81 (3) | 65 (5) | 43 (1) | / |
8·XB2ChBPh | / | / | / | 69 (1) |
8·XB2ChBpCF3 | / | / | / | 173 (3) |
9·XB3ChB | >105 | >105 | 3,080 (153) | / |
9·XB2ChB2 | 10,600 (394) | 4,220 (137) | 1,090 (21) | / |
9·ChB3XB | 557 (13) | 253 (4) | 99 (2) | / |
9·ChB4 | 172 (2) | 100 (1) | 56 (1) | / |
