Mechanism of reaction of iron(III) with phenolic derivatives

✍ Scribed by U.D. Gomwalk; A.G. Lappin; J.P. McCann; A. McAuley

• Book ID: 104139115
• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 422 KB
• Volume: 24
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)93848-9

✦ Synopsis

The complex formation reactions between iron(III) and four phenolic derivatives, salicylamide (A), salicylaldehyde (B), 2-hydroxyacetophenone (C) and 2-(hydroxymethyl)phenol (D), have been investigated using the stopped jlow technique. For the ligands (A), (B), (C), the mechanism involves the reaction of the protonated ligands with both Fe"and FeO@' (second order rate constants at T = 25 "C, I = l.OM (LiClO,) are Fe" +(A), (B), (C) 14.5,2.6, and 3.0 M-' s-l respectively and FeOfl' + (A), (B), (C) 2900, 1370, and 1840 M-' s-l). For (D), only the reaction of FeO@' with the ligand is observed (FeOp' + (0) 1000 M-1 s-'). Thermodynamic parameters have been evaluated and the data are compared with other systems of this type. The complexation mechanism is considered to involve some degree of associative character.