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The title PtIV complex, [PtCl4(C16H28N4O6)] or trans-[PtCl4{NH=C(Et)ON=C(Me)C(=O)OEt}2], possesses a crystallographically imposed centre of symmetry. The coordination environment of the metal centre is a slightly distorted octa­hedron. An intra­molecular N—H...N hydrogen bond between the imine H atom and the oxime N atom stabilizes the E configuration of the imine groups.

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The title compound, [Ni(C6H15NO3)2](C8H4O4), consists of a [Ni(H3tea)2]2+ cation (H3tea is triethano­lamine) and a benzene-1,4-dicarboxyl­ate (terephthalate) anion. The NiII atom lies on an inversion centre and exhibits a slightly distorted octa­hedral coordination geometry formed by two mol­ecules of H3tea acting as N,O,O′-tridentate ligands; the anion is also centrosymmetric. All the OH groups of H3tea are involved in an O—H...O hydrogen-bonding network with terephthalate O atoms, thus linking the mol­ecular units in chains and forming a two-dimensional infinite network.
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