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Stable at room temperature, the peroxocopper(II) cation in 1 (HL = 4‐methyl‐2,6‐bis(pyrrolidinomethyl)phenol) is a tetranuclear complex (the picture shows the central unit) that displays several unusual structural details, including a μ4‐bridging peroxo ligand. Peroxocopper(II) complexes are, in general, unstable compounds that can often be characterized only by spectroscopic methods at low temperatures. • equals; Cu, ○ = O, = N.

O substitution in 1. The tetranuclear copper(ii) complexes 1 and 4 are strongly antiferromagnetically coupled. They possess S 0 ground states separated from a triplet state by 510 and 720 cm À1, respectively. Good fits result from a regular spin Hamiltonian as well as from the Bleaney ± Bowers equation, which shows that only the two lowest-lying states are notably thermally populated. Magnetostructural correlations established for dimeric complexes are not easily transferable to these kinds of tetrameric complexes. Investigations in methanolic solution provide evidence that a tetranuclear m 4 -oxocopper(ii) complex analogous to 4 can be converted into a tetranuclear m 4 -peroxocopper-(ii) complex analogous to 1.

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