Acta Cryst. (2014). B70, 19-27 [ doi:10.1107/S2052520613034550 ]
Abstract: Three new metal-organic framework structures containing EuIII and the little explored methanetriacetate (C7H7O63-, mta3-) ligand have been synthesized. Gel synthesis yields a two-dimensional framework with the formula [Eu(mta)(H2O)3]n·2nH2O, (I), while two polymorphs of the three-dimensional framework material [Eu(mta)(H2O)]n·nH2O, (II) and (III), are obtained through hydrothermal synthesis at either 423 or 443 K. Compounds (I) and (II) are isomorphous with previously reported GdIII compounds, but compound (III) constitutes a new phase. Compound (I) can be described in terms of dinuclear [Eu2(H2O)4]6+ units bonded through mta3- ligands to form a two-dimensional framework with topology corresponding to a (6,3)-connected binodal (43)(466683)-kgd net, where the dinuclear [Eu2(H2O)4]6+ units are considered as a single node. Compounds (II) and (III) have distinct three-dimensional topologies, namely a (41263)(4966)-nia net for (II) and a (41065)(41164)-K2O2; 36641 net for (III). The crystal density of (III) is greater than that of (II), consistent with the increase of temperature, and thereby autogeneous pressure, in the hydrothermal synthesis.
Keywords: metal-organic frameworks; polymorphism; topology.
Structure factor file (CIF format) (144.4 kbytes)
Structure factor file (CIF format) (157.7 kbytes)
Structure factor file (CIF format) (153.8 kbytes)
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