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Synthesis, Characterization, and Oxygenation Studies of Carboxylate‐Bridged Diiron(II) Complexes with Aromatic Substrates Tethered to Pyridine Ligands and the Formation of a Unique Trinuclear Complex
Author(s) -
Friedle Simone,
Lippard Stephen J.
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200900821
Subject(s) - chemistry , carboxylate , ligand (biochemistry) , pyridine , steric effects , stereochemistry , molecule , phenol , medicinal chemistry , organic chemistry , biochemistry , receptor
In this study, diiron(II) complexes were synthesized as small molecule mimics of the reduced active sites in the hydroxylase components of bacterial multicomponent monooxygenases (BMMs). Tethered aromatic substrates were introduced in the form of 2‐phenoxypyridines, incorporating hydroxy and methoxy functionalities into windmill‐type diiron(II) compounds [Fe 2 (μ‐O 2 CAr R ) 2 (O 2 CAr R ) 2 (L) 2 ] ( 1 – 4 ), where – O 2 CAr R is a sterically encumbering carboxylate, 2,6‐bis(4‐fluorophenyl)‐, or 2,6‐bis( p ‐tolyl)benzoate (R = 4‐FPh or Tol, respectively). The inability of 1 – 4 to hydroxylate the aromatic substrates was ascertained. Upon reaction with dioxygen, compounds 2 and 3 (L = 2‐( m ‐MeOPhO)Py, 2‐( p ‐MeOPhO)Py, respectively) decompose by a known bimolecular pathway to form mixed‐valent diiron(II,III) species at low temperature. Use of 2‐(pyridin‐2‐yloxy)phenol as the ligand L resulted in a doubly bridged diiron complex 4 and an unprecedented phenoxide‐bridged triiron(II) complex 5 under slightly modified reaction conditions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)