Dinuclear Cu(I)/Cu(II) centers are present in various biologically crucial enzymes, such as the particulate methane monooxygenase (pMMO), that catalyze crucial conversions. Synthetic dicopper complexes have been shown to facilitate various C-H activation reactions, including that of methane to methanol. Redox and magnetic properties are also major research foci of dicopper centers owing to their simple electronic exchange model. A sterically bulk poly-nitro pyrazolato ligand, 3,5-bis(2,4-dinitrophenyl)-4-nitro-pyrazolate (PNpz-), was used to prepare dinuclear Cu(I) and Cu(II) complexes that interconvert upon exposure to oxygen, water or other reactive species. The air-stable [CuI2] complex, {Cu(2,2’-bipy)(µ-PNpz)}2 ([1]), is converted to {Cu2(µ-OH)(2,2’-bipy)2(µ-PNpz)2}1+ ([2]+) upon exposure to water or DMSO. On the other hand, [2]+ converts to (1) when exposed to toluene. We will discuss the structural and spectroscopic properties of these two complexes and other products obtained during the investigation of the Cu(II)/Cu(I) redox chemistry.

Evaluation of oxygen-transfer properties of dinuclear copper pyrazolato complexes

2019 Spring National Meeting

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