Solid-state coexistence of {Zr12} and {Zr6} zirconium oxocarboxylate clustersElectronic supplementary information (ESI) available: Crystallographic details, additional structural plots, thermal stability studies. CCDC 931733 and 931734. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c3ce41829d

Ligand metathesis, Co( ii ) coordination, and partial condensation reactions of an archetypal {Zr 6 } zirconium oxocarboxylate cluster result in the first example of the coexistence of the distinct zirconium oxide frameworks {Zr 6 O 8 } and {Zr 12 O 22 }. Even minor modifications to the reaction conditions push this apparent equilibrium towards the {Zr 6 O 8 }-based product. Ligand metathesis, Co( ii ) coordination, and partial condensation reactions of an archetypal {Zr 6 } zirconium oxocarboxylate cluster result in the first example of the coexistence of the distinct zirconium oxide frameworks {Zr 6 O 8 } and {Zr 12 O 22 }.