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In the title complex, [Mn2(C15H13N2O3)3]ClO4·CH3OH, the two MnII ions are bridged by two phenolate O atoms from two ligands, forming an Mn2O2 quadrangle. Each MnII ion has a distorted octa­hedral coordination geometry. One MnII ion is coordinated by two N atoms and four O atoms from two ligands, and the other is coordinated by one N atom and five O atoms from three ligands. A dimer is formed by inter­molecular N—H...O hydrogen bonds. The dimers, perchlorate anions and methanol solvent mol­ecules are further connected into a chain along [\overline{1}01] through N—H...O and O—H...O hydrogen bonds.

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In the title compound, C16H16N2O4·H2O, the dihedral angle between the two benzene rings is 12.4 (2)° and the mol­ecule adopts an E configuration with respect to the C=N bond. There are intra­molecular O—H...N and O—H...O hydrogen bonds in the hydrazone mol­ecule, which both generate S(6) rings. In the crystal structure, mol­ecules are linked by N—H...O and O—H...O hydrogen bonds, forming layers parallel to the ab plane. The crystal studied was a non-merohedral twin with a domain ratio of 0.887 (3):0.113 (3).
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