There are many formally copper(iii) complexes, but X-ray spectroscopy and theory now reveal that they often feature strong covalence and physical oxidation states lower than +iii.

中文翻译：

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铜喜剧

形式上有很多铜（iii）配合物，但现在的X射线光谱和理论表明，它们通常具有强共价键和低于+ iii的物理氧化态。