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In the title complex, {[Mn(C4O4)(C10H8N2)(H2O)]·H2O}n, each MnII ion has a distorted octa­hedral coordination formed by two N atoms of a 2,2′-bipyridine ligand, three carboxyl O atoms of three different acetyl­ene­dicarboxyl­ate ligands and one coordinated water mol­ecule. The acetyl­ene­dicarboxyl­ate ligands act in a tridentate mode connecting adjacent MnII ions and constructing a two-dimensional structure which can be regarded as an unusual plywood-like stacked network.

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In the title complex, [Mn(SO4)(C3H7NO)(H2O)2]n, each MnII ion has a distorted octa­hedral geometry formed by three O atoms of three different sulfate groups, one O atom of a dimethyl­formamide ligand and two water mol­ecules. The sulfate groups act as tridentate bridging ligands connecting the MnII ions into a two-dimensional layer structure which can be regraded as a 4.82 network.

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The CdII centre in the title complex, [Cd(C14H13N3O2)2(H2O)4](NO3)2, occupies a crystallographic inversion centre and is coordinated by two donor N atoms from two 2-methoxy­benzldehyde isonicotinoylhydrazone ligands and by four O atoms from four coordinated water mol­ecules, giving a slightly distorted octa­hedral geometry. There is an extended three-dimensional network structure resulting from O—H...O hydrogen bonds between coordinated water and nitrate anions, and between coordinated water and carbonyl O atoms, and from N—H...O hydrogen bonds between NH groups and nitrate O atoms.
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