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Solvothermal synthesis has produced two new crystal structures derived from the Zn¨Cterephthalic acid¨CDMF system. The major synthesis product is the metastable Zn(C8H4O4)(C3H7NO), 1, which converts completely over a period of 12 months to the known crystalline phase MOF-2, the phase obtained by crystallization at ambient conditions [19,21]. Thus, solvothermal synthesis in this MOF system produces metastable products under kinetic control. An additional phase, Zn(HCO2)3(C2H8N), 2, is also produced, derived from decomposition of the DMF moieties, demonstrating clearly the risks for undesired reactant decomposition under these solvothermal condi- tions. The phase 2 is stable over the 12-month period. The study demonstrates that MOF syntheses can produce not only multiple crystal structures under different conditions, but also numerous different structures, including some that are metastable, under identical conditions. |
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