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A solution of benzene-1,4-dicarboxylic acid (2 mmol,
0.324 g) in DMF (8 mL) was added to a solution of
Zn(NO3)26H2O (2 mmol, 0.582 g) in DMF (2 mL). The
mixture was heated in an autoclave for 4 days at 381 K.
Cooling of the vessel to room temperature resulted at first
in two types of macroscopically similar colourless single
crystals (1 and 2) suitable for X-ray analysis. The sample
was kept in the solvent due to sensitivity to exposure in air.
The synthesis batch was re-examined after 12 months, and
a single crystal of MOF-2 was picked from the solution.

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