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We report here a DCL study of a phenanthroline-based building block focusing on catenane formation with copper templates. Two [2]catenanes have been amplified by using Cu+ as a template from the DCLs that contain no interlocked compounds in the absence of copper. In addition, an unexpected Cu2+ template effect on the [2]catenane formation was discovered. The observed Cu2+ template effect was found to originate from the in situ reduction of the divalent metal to Cu+.

Graphical abstract: Discoveries from a phenanthroline-based dynamic combinatorial library: catenane from a copper(i) or copper(ii) template?

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