| Entry |
Catalyst |
Amax |
[I]s % |
[IH+]s % |
H0 |
| 1 |
- |
2.9839 |
100 |
0 |
- |
| 2 |
NSPVPC |
1.4387 |
48.2 |
51.8 |
0.96 |
| 3 |
PVPHS |
1.0942 |
36.7 |
63.3 |
0.75 |
| 4 |
NSPVPHS |
0.6831 |
22.9 |
77.1 |
0.46 |
Conditions for UV–visible spectrum measurement: solvent: CH2Cl2, indicator:
4-nitroaniline (pK(I)aq = 0.99), 1.44x 10-4 mol/L; Catalyst: PVPHS or NSPVPHS, 2
mg, 20.9 °C. The calibration curves with the linearity higher than 0.999 for indicator
in the unprotonated form were constructed using its CH2Cl2 solution |
