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We present mixed-valence Cu(I)1Cu(II)2(BTC)2 [henceforth Cu(I/II)-HKUST-1], post-synthetically prepared via the hydroquinone (H2Q) treatment of Cu(II)3(BTC)2 (also referred to as HKUST-1) and its subsequent catalytic activity. This Cu(I/II)-HKUST-1 exhibits exceptional structural integrity and superior catalytic performance in the copper-catalyzed azide–alkyne cycloaddition (CuAAC) reaction between phenylacetylene and benzyl azide. These findings highlight the potential of mixed-valence Cu-based MOFs as effective and sustainable heterogeneous catalysts for organic transformations, paving the way for future advancements in MOF-based catalysis.

Graphical abstract: Hydroquinone-treated Cu3(BTC)2: a mixed-valence Cu(i/ii) MOF catalyst for efficient cycloadditions

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