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The title compound, [La2(C8H3NO6)2(C8H4NO6)2(H2O)6]·2H2O, consists of dimeric units related by an inversion center. The two LaIII atoms are linked by two bridging bidentate carboxyl­ate groups and two monodentate carboxyl­ate groups. Each LaIII atom is nine-coordinated by six O atoms from five different carboxyl­ate groups and three from water mol­ecules. Hydrogen bonds between the water mol­ecules and between the solvent water and a carboxyl­ate O atom are observed in the structure. In the crystal packing, there are slipped π–π stacking inter­actions between the parallel benzene rings. Both hydrogen-bonding and π–π inter­actions combine to stabilize the three-dimensional supra­molecular network.

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In the crystal structure of the title compound, C21H21NO2, strong N—H...O and O—H...O hydrogen bonds exist. The keto–amine form is favoured over the enol–imine form in the tautomerism. Six-membered chelate rings formed by intra­molecular hydrogen bonds increase the stability of the whole mol­ecule. Inter­molecular hydrogen bonds link adjacent units together, forming an infinite one-dimensional chain parallel to the a axis.

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In the title complex, [Mn(C8H4NO6)2(H2O)4]·2H2O, cyclic water tetra­mers forming one-dimensional metal–water chains have been observed. The water clusters are trapped by the co-­operative association of coordination inter­actions and hydrogen bonds. The MnII ion resides on a center of symmetry and is in an octa­hedral coordination environment comprising two O atoms from two 5-carboxy-2-nitrobenzoate ligands and four O atoms from water mol­ecules.

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In poly[[aqua­strontium(II)]-μ6-4-nitro­benzene-1,3-dicarb­oxyl­ato-κ7O1:O2:O2:O3:O3,O4:O4], [Sr(C8H3NO6)(H2O)]n, the SrII ion displays a distorted bicapped triangular prismatic configuration, defined by seven carboxyl O atoms from six symmetry-related ligands and one water mol­ecule. The ligand mol­ecules connect the SrII ions into a two-dimensional layered framework in the ac plane, with close O...O contacts between the nitro groups and with each nitro group providing one acceptor O atom for a weak inter­molecular C—H...O hydrogen bond.
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