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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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