Abstract
Diiron(II) complex with a new dinucleating ligand containing terminal amino group, 2,6-bis[bis(6-pivalamido-2-pyridylmethyl)aminomethyl]-4-aminophenol (tppap) (1), [Fe2(tppap)(C6H5COO)2]+ (2), was synthesized. The self-assembled monolayer (SAM) of 2, 2/Au, was prepared by the coupling reaction between 2 and activated ester-modified Au electrode. The redox behavior of 2/Au was observed in aqueous solution at room temperature, which suggests that 2 on Au surface has been stabilized as compared with 2 in homogeneous solution. In addition, the redox potentials of 2/Au assignable to Fe2(II,II)/(III,III) and Fe2(II,III/III,III) shifted to negative direction by bubbling of molecular dioxygen, which returned to the original potential by Ar bubbling. These behaviors were reversible, suggesting that 2/Au can reversibly bind/release molecular dioxygen in aqueous solution at room temperature.
