TY - JOUR
T1 - Models of the oxidized forms of polyiron oxo proteins
T2 - synthetic routes to (μ-oxo)bis(μ-carboxylato)diiron(III) complexes with neutral monodentate and bidentate capping ligands
AU - Taft, Kingsley L.
AU - Masschelein, Axel
AU - Liu, Shuncheng
AU - Lippard, Stephen J.
AU - Garfinkel-Shweky, Diana
AU - Bino, Avi
PY - 1992
Y1 - 1992
N2 - Two (μ-oxo)bis(μ-carboxylato)diiron(III) complexes with neutral monodentate and bidentate terminal ligands have been prepared that incorporate features of the diiron oxo centers in the non-heme iron proteins hemerythrin (Hr) and the B2 subunit of ribonucleotide reductase (RRB2) that were not previously modeled. [Fe2O(OH2)2(O2CCH2Cl)2(bpy)2](NO3)2 (1) and [Fe2O(CH3OH)2(O2CCH3)2(BIPhMe)2](NO3)2 (2) were synthesized from the appropriate basic iron carboxylate, ferric nitrate and the bidentate nitrogen ligand bpy or BIPhMe. The molecular structures, as determined by X-ray crystallography, and the electronic spectral, Mössbauer and magnetic properties of 1 and 2 reproduce many of the physical properties of the met forms of Hr and RRB2. A singly-bridged (μ-oxo)diiron(III) complex, [Fe2O(NO3)4(bpy)2] (3), was also prepared from ferric nitrate and bpy. The chelating bpy and nitrate ligands afford seven-coordinate ferric centers in the centrosymmetric compound. Complex 3 serves as a synthon for the (μ-oxo)bis(μ-carboxylato)diiron(III) core, for the reaction of 3 with excess chloroacetic acid gives 1.
AB - Two (μ-oxo)bis(μ-carboxylato)diiron(III) complexes with neutral monodentate and bidentate terminal ligands have been prepared that incorporate features of the diiron oxo centers in the non-heme iron proteins hemerythrin (Hr) and the B2 subunit of ribonucleotide reductase (RRB2) that were not previously modeled. [Fe2O(OH2)2(O2CCH2Cl)2(bpy)2](NO3)2 (1) and [Fe2O(CH3OH)2(O2CCH3)2(BIPhMe)2](NO3)2 (2) were synthesized from the appropriate basic iron carboxylate, ferric nitrate and the bidentate nitrogen ligand bpy or BIPhMe. The molecular structures, as determined by X-ray crystallography, and the electronic spectral, Mössbauer and magnetic properties of 1 and 2 reproduce many of the physical properties of the met forms of Hr and RRB2. A singly-bridged (μ-oxo)diiron(III) complex, [Fe2O(NO3)4(bpy)2] (3), was also prepared from ferric nitrate and bpy. The chelating bpy and nitrate ligands afford seven-coordinate ferric centers in the centrosymmetric compound. Complex 3 serves as a synthon for the (μ-oxo)bis(μ-carboxylato)diiron(III) core, for the reaction of 3 with excess chloroacetic acid gives 1.
UR - http://www.scopus.com/inward/record.url?scp=0000997286&partnerID=8YFLogxK
U2 - 10.1016/S0020-1693(00)92407-1
DO - 10.1016/S0020-1693(00)92407-1
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AN - SCOPUS:0000997286
SN - 0020-1693
VL - 198-200
SP - 627
EP - 631
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - C
ER -