A reversible reaction with dioxygen is observed for the copper(I) complex [Cu(Me6tren)]+ (Me6tren=tris(2-dimethylaminoethyl)amine) at low temperatures. This complex displays an interesting crystal structure (depicted) and the interaction with dioxygen in solution was investigated by low-temperature UV/Vis spectroscopic methods.
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Becker et al. (1999) studied this question.