Research Article
Antioxidative Reactivity of L-Ascorbic Acid and D-Isoascorbic Acid Species towards Reduction of Hexachloroiridate (IV)
Table 1
Observed second-order rate constants for the reduction of [IrCl6]2– by AA and IAA at 25.0°C and 1.0 M ionic strength.
| Reductant | pH | k′/M−1s−1 |
| AA | 0.16 | (7.6 ± 0.1) × 103 | 0.26 | (9.6 ± 0.2) × 103 | 0.41 | (1.66 ± 0.02) × 104 | 0.63 | (2.42 ± 0.04) × 104 | 0.81 | (3.01 ± 0.06) × 104 | 1.11 | (5.49 ± 0.09) × 104 | 1.41 | (1.29 ± 0.03) × 105 | 1.63 | (2.19 ± 0.05) × 105 | 1.81 | (3.75 ± 0.09) × 105 | 2.11 | (6.8 ± 0.2) × 105 | 2.33 | (1.15 ± 0.06) × 106 | IAA | 0.16 | (7.5 ± 0.1) × 103 | 0.26 | (8.3 ± 0.2) × 103 | 0.41 | (1.40 ± 0.02) × 104 | 0.63 | (2.04 ± 0.04) × 104 | 0.81 | (2.78 ± 0.06) × 104 | 1.11 | (4.78 ± 0.08) × 104 | 1.41 | (9.4 ± 0.03) × 104 | 1.63 | (1.97 ± 0.04) × 105 | 1.81 | (3.10 ± 0.07) × 105 | 2.11 | (6.1 ± 0.1) × 105 | 2.33 | (1.00 ± 0.02) × 106 |
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