Bistable and Porous Metal–Organic Frameworks with Charge-Neutral acs Net Based on Heterometallic M3O(CO2)6 Building Blocks

A Co­(II)–Ti­(IV) heterometallic approach is successfully adopted to synthesize charge-neutral metal–organic frameworks based on oxo-centered trinuclear cluster and linear dicarboxylate linkers. Unlike their homonuclear predecessors, the cobalt–titanium–organic frameworks not only display a permanent porosity but also show an irreversible phase transition between two stable forms as unambiguously characterized by single-crystal and powder X-ray diffraction studies.