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Structural and functional comparison of manganese-, iron-, cobalt-, nickel- and copper-containing biomimic quercetinase models

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26: A. Matuz; M. Giorgi; G. Speier; J. Kaizer: Structural and functional comparison of manganese-, iron-, cobalt-, nickel- and copper-containing biomimic quercetinase models. POLYHEDRON, 63 (2013) 41-49.

A series of divalent transition metal (Mn, Fe, Co, Ni, and Cu) flavonolate (Fla) complexes MII(Fla)(L1), and MII(Fla)(L2)X (X = Cl or ClO4) with the ligands N-propanoate-N,N-bis(2-pyridylmethyl)amine (L1 = HPBMPA) and N-methylpropanoate-N,N-bis(2-pyridylmethyl)amine (L2 = MPBMPA) have been prepared and characterized by spectroscopic methods and two cases by X-ray crystal analysis. The coordination sphere of the central ions is distorted octahedral with N3 or N3O donor sets, which are good structural models for the cupin-type metal-containing flavonol 2,4-dioxygenases (FDO). The dioxygenation of the metal flavonolate complexes results in the oxidative cleavage of the

heterocyclic ring to give the corresponding O-benzoylsalicylate complexes and carbon monoxide as biomimic FDO models. The bathochromic shift of the absorption band I (π-πi*) of the coordinated flavonolate is influenced by the metals, and a linear correlation was observed between the logarithm of the reaction rate constant with O2 and the degree of the bathochromic shift (∆λ), providing a mechanistic insight into the stoichiometric dioxygenation reactions.

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