TABLE 2.
Predicted chelates of Fe3+ (20 μM) in the presence of 500 μM oxalate and a 500 μM concentration of the indicated catechol
| Chelatea | Concn (μM)
|
|||
|---|---|---|---|---|
| 1,2-Dihydroxybenzene dianion
|
2,3-Dihydroxybenzoic acid dianion
|
|||
| pH 7.0 | pH 4.1 | pH 7.0 | pH 4.1 | |
| Fe(ox)+ | 0.00 | 0.00 | 0.00 | 0.00 |
| Fe(ox)2− | 0.00 | 1.09 | 0.24 | 1.09 |
| Fe(ox)33− | 0.03 | 18.91 | 7.11 | 18.91 |
| Fe(cat)+ | 0.01 | 0.00 | 12.65 | 0.00 |
| Fe(cat)2− | 19.89 | 0.00 | 0.00 | 0.00 |
| Fe(cat)33− | 0.06 | 0.00 | 0.00 | 0.00 |
| Fe(ox)(cat)− | 0.00 | 0.00 | 0.00 | 0.00 |
| Fe(ox)2(cat)3− | 0.00 | 0.00 | 0.00 | 0.00 |
| Fe(ox)(cat)23− | 0.00 | 0.00 | 0.00 | 0.00 |
a
Abbreviations: ox, oxalate; cat, catechol.