The facile preparation of mixed-valence metal–organic frameworks through reduction

A facile strategy was applied to prepare Cu(I)/Cu(II) MOFs, where the Cu(I) amount and porous structure can be adjusted by the degree of reduction and the size of HKUST-1, by partially reducing HKUST-1 with hydrazine hydrate at room temperature. The Cu(I)/Cu(II) MOFs exhibit excellent catalytic capability in the Cu(I)-catalyzed azide alkyne cycloaddition.