Determined extraction constants (log Kex±) using SXLSQI for host-mediated extraction of TBPCl, TBPBr, TBPI, and TBPNO3 from water into nitrobenzene at 25 °Ca.
| TBPX | Equilibrium | Log Kex± |
|---|---|---|
| TBPCl | TBP+(aq) + Cl−(aq) + R(org) ⇌ TBP+(org) + RCl−(org) | 3.9 ± 0.2 |
| TBP+(aq) + Cl−(aq) + 2R(org) ⇌ TBP+(org) + R2Cl−(org) | 6.7 ± 0.2 | |
| TBPBr | TBP+(aq) + Br−(aq) + R(org) ⇌ TBP+(org) + RBr−(org) | 4.17 ± 0.06 |
| TBP+(aq) + Br−(aq) + 2R(org) ⇌ TBP+(org) + R2Br−(org) | 7.20 ± 0.07 | |
| TBPI | TBP+(aq) + I−(aq) + R(org) ⇌ TBP+(org) + RI−(org) | 4.34 ± 0.06 |
| TBPNO3 | TBP+(aq) + NO3−(aq) + R(org) ⇌ TBP+(org) + RNO3−(org) | 4.65 ± 0.03 |
a
Observed values of DP were taken from Tables S5–S8, yielding the corresponding output values of refined log Kex±. In the fitting of the extraction data for each anion, the corresponding log Kp values were fixed at the values shown in Table 1 to account for the background extraction of TBPX by nitrobenzene alone.