Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 12, 2007
Previous Article Next Article

Mechanistic studies on oxidation of L-ascorbic acid by an oxo-bridged diiron complex in aqueous acidic media

Author affiliations

Abstract

[Fe2(µ-O)(phen)4(H2O)2]4+ (1) (Fig. 1, phen = 1,10-phenanthroline) equilibriates with [Fe2(µ-O)(phen)4(H2O)(OH)]3+ (2) and [Fe2(µ-O)(phen)4(OH)2]2+ (3) in aqueous solution in the presence of excess phen, where no phen-releasing equilibria from 1, 2 and 3 exist. 1 quantitatively oxidizes ascorbic acid (H2A) to dehydroascorbic acid (A) in the pH range 3.00–5.50 in the presence of excess phen, which buffers the reaction within 0.05 pH units and ensures complete formation of end iron product ferroin, [Fe(phen)3]2+. The reactive species are 1, 2 and HA and the reaction proceeds through an initial 1 : 1 inner-sphere adduct formation between 1 and 2 with HA, followed by a rate limiting outer-sphere one electron one proton (electroprotic) transfer from a second HA to the ascorbate-unbound iron(III).

Graphical abstract: Mechanistic studies on oxidation of l-ascorbic acid by an oxo-bridged diiron complex in aqueous acidic media

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Nov 2006, accepted on 31 Jan 2007 and first published on 08 Feb 2007


Article type: Paper
DOI: 10.1039/B615593F
Dalton Trans., 2007, 1214-1220

  •   Request permissions

    Mechanistic studies on oxidation of L-ascorbic acid by an oxo-bridged diiron complex in aqueous acidic media

    J. Bhattacharyya, S. Das and S. Mukhopadhyay, Dalton Trans., 2007, 1214
    DOI: 10.1039/B615593F

Search articles by author

Spotlight

Advertisements