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The title compound, [Mg(C5H3N2O4)2(H2O)2], consists of centrosymmetric neutral monomers in which two O,O′-bidentate imidazolinium-4,5-dicarboxyl­ate ligands are bonded to the MgII ion. One of the carboxyl protons is transferred to the N atom of the imidazole ring. The octa­hedral metal-ion coordination is completed by two trans water O atoms. In the crystal, mol­ecules are linked by N—H...(O,O) and O—H...O hydrogen bonds.

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The asymmetric unit of the polymeric title compound, [Mg3(C9H3O6)2(C3H7NO)4]n, contains three MgII ions bridged by carboxyl­ate O atoms from two fully deprotonated benzene-1,3,5-tricarboxyl­ate (BTC) trianions and four metal-coordinated dimethyl­formamide (DMF) mol­ecules. One MgII ion is octa­hedrally coordinated by six carboxyl­ate O atoms. The other two cations are each octa­hedrally coordinated by four carboxyl­ate O atoms and two O atoms donated by two DMF mol­ecules: in one, the DMF mol­ecules are cis and in the other they are trans. The three MgII octa­hedra form clusters, which are bridged by the BTC trianions, generating a three-dimensional structure.
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