Direct Evidence for Oxygen-Atom Exchange between Nonheme Oxoiron(IV) Complexes and Isotopically Labeled Water

✍ Scribed by Mi Sook Seo; Jun-Hee In; Sun Ok Kim; Na Young Oh; Jongki Hong; Jinheung Kim; Lawrence Que Jr.; Wonwoo Nam

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 139 KB
• Volume: 43
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.200353497

✦ Synopsis

Complexes 1 and 2 were prepared by treating [Fe(TMC)(OTf) 2 ] (2 mm) and [Fe(N4Py)(ClO 4 ) 2 ] (2 mm), respectively, with 1 equivalent of peracid (peracetic acid for 1 and m-chloroperbenzoic acid for 2) in CH 3 CN (3 mL) at 10 8C. [7] After appropriate amounts of H 2 18 O were added to the reaction solution at the given temperature controlled by a circulating water bath, samples were infused directly into the source at 20 mL min À1 by using a syringe pump. The spray voltage was set at 4 kV and the capillary temperature at 70 8C. The percentages of 18 O in the mass spectra of 1 and 2 were calculated by fitting the characteristic isotope distribution patterns. Two traces of observed isotopic distribution patterns of 1 before and after addition of labeled water were provided with the bars representing the calculated isotope distributions (Supporting Information).