Table 3.
Rate constants (kobs) for substrates I–IV. Only the pseudo-first order rate constants are reported, since all studies were performed at a constant concentration of A.
| substrate | background (×10−3·s−1) | catalyst A (×10−3·s−1) | Au MPC 1 (×10−3·s−1) | Au MPC 1•A (×10−3·s−1) | Au MPC 1•WDDD (×10−3·s−1) | Ratio a |
|---|---|---|---|---|---|---|
| I | 0.05 | 0.05 | 1.0 | 8.9 | 0.3 | 30 |
| II | 0.01 | 0.03 | 0.9 | 7.2 | 0.4 | 18 |
| IIIL | 0.05 | 0.04 | 0.2 | 2.0 | 0.1 | 20 |
| IIID | 0.05 | 0.04 | 0.2 | 2.0 | 0.1 | 20 |
| IV | 2.5 | 2.5 | 5.5 | 4.2 | 2.5 | 1.7 |
| V | 0.01 | - | 0.01 | 0.1 | 0.01 | 10b |
| VI | 0.01 | 0.01 | 0.01 | 0.2 | 0.01 | 20b |
a
The ratio refers to the observed rate acceleration between the catalytic system Au MPC 1•A and Au MPC 1•WDDD (i.e., columns 5 and 6, respectively);
b
This ratio is mainly determined by the very low rate constant determined for Au MPC 1•WDDD.