Please use this identifier to cite or link to this item:
|Title:||Iron(II)-catecholate complexes of a monoanionic facial N3 ligand: Structural and functional models of the extradiol cleaving catechol dioxygenases|
Paine, Tapan Kanti
|Abstract:||Two biomimetic iron(II)-catecholate complexes, [(TpPh2)FeII(CatH)] (1) and [(TpPh2)FeII(DBCH)] (2) (where TpPh2 = hydrotris(3,5-diphenylpyrazole-1-yl)borate, CatH = monoanionic pyrocatecholate and DBCH = monoanionic 3,5-di-tert-butyl catecholate), have been isolated and characterized to study their reactivity towards dioxygen. The single-crystal X-ray structure of (1) reveals a high-spin iron(II) center ligated by the monoanionic facial N3 ligand and a monoanionic catecholate, giving rise to a trigonal bipyramidal coordination geometry. Complex (1) represents the first structurally characterized five-coordinate iron(II)-catecholate complex with an asymmetric bidentate binding motif of monoanionic catecholate. While (1) reacts with dioxygen to form the corresponding iron(III)-catecholate, (2) reacts with dioxygen to give 75 % extradiol and 25 % intradiol cleavage products via an iron(III)-catecholate intermediate species. Complex (2) is a potential functional model of extradiol cleaving catechol dioxygenases.|
|Appears in Collections:||IJC-A Vol.50A(03-04) [March-April 2011]|
Files in This Item:
|IJCA 50A(03-04) 420-426.pdf||413.58 kB||Adobe PDF||View/Open|
Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.