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Crystal structure of catena -poly[[[aqua-bis-(di-methyl-formamide-κ O )magnesium(II)]-μ 3 -(2,2'-bi-pyridine-5,5'-di-carboxyl-ato-κ 5 O 2 : O 2' : N , N ': O 5 )-[di-chlorido-platinum(II)]] di-methyl-formamide monosolvate



Crystal structure of catena -poly[[[aqua-bis-(di-methyl-formamide-κ O )magnesium(II)]-μ 3 -(2,2'-bi-pyridine-5,5'-di-carboxyl-ato-κ 5 O 2 : O 2' : N , N ': O 5 )-[di-chlorido-platinum(II)]] di-methyl-formamide monosolvate



Acta Crystallographica. Section E Crystallographic Communications 73(Pt 7): 971-974



The title compound, {[MgPtCl2(C12H6N2O4)(C3H7NO)2(H2O)]·C3H7NO} n , is a one-dimensional coordination polymer. The structure consists of Pt-functionalized bi-pyridine ligands connected by MgII cations, as well as coordinating and non-coordinating solvent mol-ecules. The PtII cation is coordinated by the two N atoms of the bi-pyridine moiety and two Cl atoms in a square-planar fashion. This coordination induces an in-plane bend along the bi-pyridine backbone of approximately 10° from the linear ideal of a conjugated π-system. Likewise, the coordination to the MgII cation induces a significant bowing of the plane of the bi-pyridine of about 12°, giving it a distinct curved appearance. The carboxyl-ate groups of the bi-pyridine ligand exhibit moderate rotations relative to their parent pyridine rings. The MgII cation has a fairly regular octa-hedral coordination polyhedron, in which three vertices are occupied by O atoms from the carboxyl-ate groups of three different bi-pyridine ligands. The remaining three vertices are occupied by the O atoms of two di-methyl-formamide (DMF) mol-ecules and one water mol-ecule. The one-dimensional chains are oriented in the [01-1] direction, and non-coordinating DMF mol-ecules can be found in the space between the chains. The shortest inter-molecular O⋯H contacts are 2.844 (4) and 2.659 (4) Å, suggesting moderate hydrogen-bonding inter-actions. In addition, there is a short inter-molecular Pt⋯Pt contact of 3.491 (1) Å, indicating a Pt stacking inter-action. Some structure-directing contribution from the hydrogen bonding and Pt⋯Pt inter-action is probable. However, the crystal packing seems to be directed primarily by van der Waals inter-actions.

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Accession: 059567353

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PMID: 28775863

DOI: 10.1107/s2056989017008118


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