Ruthenium complexes of B ring substituted flavonols were synthesized and characterized by 1H NMR, 13C NMR, IR, and UV-Vis spectroscopies and X-ray crystallography. Substituents were introduced in order to determine the effects of remote electronic changes and degree of conjugation of the B ring on the metal. In these complexes with arene and chloride ligands, little difference in structure is observed for the coordination of the flavonolate to Ru. However, IR revealed that the strength of the C-O and C=O stretches are influenced by variation of the B ring. Moreover, the oxidation potentials of ruthenium-flavonolate complexes vary significantly with the conjugation of the B ring and its substituents. Redox chemistry will be explained in terms of the control of electronic density at the metal center through flavonol B ring substitution. Theoretical calculations were performed to help understand the effect of B ring conjugation in ruthenium-oxygen bonding interactions.

Ruthenium complexes of B ring substituted flavonols: Synthesis, characterization, redox chemistry and DFT studies

245th National Meeting (2013)

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