Biomimetic iron(iii) complexes of facially and meridionally coordinating tridentate 3N ligands: tuning of regioselective extradiol dioxygenase activity in organized assemblies
lower amount (18.3%) of the intradiol cleavage products (E/I, 3 : 1). Remarkably, in aqueous SDS micellar media, it shows exclusive extradiol cleavage products (79.4%) while all the other complexes show very low selectivity (E/I: 1, 0.03 : 1; 2, 79.4 : 0, 3, 0.06 : 1, 4, 0.06 : 1), suggesting the suitability of SDS medium for 2 to elicit exclusive extradiol cleavage. The TX-100 micellar medium also provides
Iron(III) Complexes with Meridional Ligands as Functional Models of Intradiol-Cleaving Catechol Dioxygenases
作者:Tünde Váradi、József S. Pap、Michel Giorgi、László Párkányi、Tamás Csay、Gábor Speier、József Kaizer
DOI:10.1021/ic302378r
日期:2013.2.4
e) are five-coordinate, trigonal bipyramidal with the isoindoline ligands occupying the two axial and one equatorial positions meridionally. These compounds served as precursors for catechol dioxygenasemodels that were formed in solution upon addition of 3,5-di-tert-butylcatechol (H2DBC) and excess triethylamine. These adducts react with dioxygen in N,N-dimethylformamide, and the analysis of the products
Iron(III) complexes of N2O and N3O donor ligands as functional models for catechol dioxygenase enzymes: ether oxygen coordination tunes the regioselectivity and reactivity
the pyridine and secondary amine nitrogen atoms and the tetrahydrofuryl oxygen atom. In [Fe(L6)Cl3] 6, [Fe(L5)(TCC)Cl] 5a and [Fe(L6)(TCC)Br] 6a the N3O donor ligands L5 and L6 act as a tridentate N3 donor ligand coordinated through two pyridine and one secondary amine nitrogen atoms, whereas the ether oxygen is not coordinated. The spectral and electrochemical properties of the adducts [Fe(L)(DBC)Cl]
New diamino-diheterophenol ligands coordinate iron(<scp>iii</scp>) to make structural and functional models of protocatechuate 3,4-dioxygenase
作者:Joshua R. Farrell、Jonathan A. Niconchuk、Peter R. Renehan、Christine S. Higham、Eric Yoon、Mark V. Andrews、Janet L. Shaw、Anil Cetin、James Engle、Christopher J. Ziegler
DOI:10.1039/c3dt53431f
日期:——
Three five-coordinate Fe(iii) complexes were prepared that are functional and structural models for the enzyme Protocatechuate 3,4-dioxygenase (3,4-PCD).
Biomimetic Intradiol-Cleavage of Catechols with Incorporation of Both Atoms of O<sub>2</sub>: The Role of the Vacant Coordination Site on the Iron Center
This is the first example of model system for the active site of protocatechuate 3,4-dioxygenase to display intradiol-cleavage of catechols with incorporation of two oxygen atoms of O2 promoted by iron complexes.