| # | Species | Formula |
| 3420 | FeCl2 (Geo) | Cl2Fe | |
| 3421 | Iron(VI) dichloride dioxide | O2Cl2Fe | |
| 3422 | Dichloro-(N-(2-salicylidene-ethyl)ethanolaminato)-iron(iii)_(WIQMOY) (Geo) | C11H15N2O2Cl2Fe | |
| 3423 | Dichloro-(N-(2-(2-hydroxyethylamino)ethyl)salicylideneimine)-iron(iii) (WIQMOY) (Geo) | C11H15N2O2Cl2Fe | |
| 3424 | FeCl3 | Cl3Fe | |
| 3425 | Fe(III)Cl3N2 (FINJIV) (Geo) | C6H18N2Cl3Fe | |
| 3426 | Fe(III)Cl3N2 (FINJIV) | C6H18N2Cl3Fe | |
| 3427 | Trichloro-bis(trimethylamine)-iron (Geo) | C6H18N2Cl3Fe | |
| 3428 | Trichloro-(N,N',N''-trimethyl-triazacyclohexane-N,N',N'')-iron(iii) (Geo) | C6H15N3Cl3Fe | |
| 3429 | Aqua-(1,10-phenanthroline-N,N')-trichloro-iron(iii) (Geo) | C12H10N2OCl3Fe | |
| 3430 | Trichloro-(1,4,7-trithiacyclononane)-iron(iii) (Geo) | C6H12S3Cl3Fe | |
| 3431 | Fe(III)Cl4(-) (Geo) | Cl4Fe | |
| 3432 | Fe(II)Cl4(2-) (GOXLUA) (Geo) | Cl4Fe | |
| 3433 | Fe(II)Cl4(2-) (GOXLUA) | Cl4Fe | |
| 3434 | Fe(III)Cl6 | Cl6Fe | |
| 3435 | Fe(III)Cl6 (DALLIL) (Geo) | C3H15N6Cl6Fe | |
| 3436 | Fe2 | Fe2 | |
| 3437 | Fe2(CO)9 | C9O9Fe2 | |
| 3438 | Fe2(CO)9 (Geo) | C9O9Fe2 | |
| 3439 | Iron dichloride, dimer | Cl4Fe2 | |
| 3440 | Iron trichloride, dimer | Cl6Fe2 | |