Crystal structure of a layered coordination polymer based on a 4(4) net containing Cd(2+) ions and 1,5-bis-(pyridin-4-yl)pentane linkers.

William T A Harrison,M John Plater,Ben M Desilva Desilva,Mark R St J Foreman

doi:10.1107/s1600536814014779

William T A Harrison, M John Plater + Show 2 more

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https://doi.org/10.1107/s1600536814014779

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Abstract

The title compound, poly[[di-aqua-bis-[1,5-bis-(pyridin-4-yl)pentane-κ(2) N:N']cadmium] bis-(perchlorate) 1,5-bis-(pyridin-4-yl)pentane ethanol mono-solvate], [Cd(C15H18N2)2(H2O)2](ClO4)2·C15H18N2·C2H6O, is a layered coordination polymer built up from highly squashed 4(4) nets in which the octa-hedral trans-CdO2N4 nodes (Cd site symmetry -1) are linked by the bifunctional ligands, forming infinite (110) sheets. The cationic sheets are charge-balanced by inter-layer perchlorate ions. A free 1,5-bis-(pyridin-4-yl)pentane mol-ecule and an ethanol mol-ecule of crystallization are also found in the inter-sheet region. A number of O-H⋯O, O-H⋯N and C-H⋯O hydrogen bonds help to consolidate the layered structure.

Highlights

[Cd(C15H18N2)2(H2O)2](ClO4)2C15H18N2C2H6O, is a layered coordination polymer built up from highly squashed 44 nets in which the octahedral transCdO2N4 nodes (Cd site symmetry 1) are linked by the bifunctional ligands, forming infinite (110) sheets
A free 1,5-bis(pyridin-4-yl)pentane molecule and an ethanol molecule of crystallization are found in the intersheet region
As part of our ongoing studies of flexible bifunctional pyridyl ligands (Plater et al, 2008) as potential metal-organic frameworks (MOFs) linkers, we describe the synthesis and structure of the title layered coordination polymer, (I), which combines Cd2+ ions and the little-studied ligand 1,5-bis(pyridin-4-yl)pentane, C15H18N2

Summary

Chemical context

The most popular linking ligands in metal-organic frameworks (MOFs) are probably multi-functional carboxylates (Batten et al, 2009) but other functional groups are possible. As part of our ongoing studies of flexible bifunctional pyridyl ligands (Plater et al, 2008) as potential MOF linkers, we describe the synthesis and structure of the title layered coordination polymer, (I), which combines Cd2+ ions and the little-studied ligand 1,5-bis(pyridin-4-yl)pentane, C15H18N2. The neutral bridging ligand necessitates the presence of perchlorate counter-ions (from the starting metal salt), which exert an important influence on the structure

Structural commentary

Supramolecular features

Database survey

Synthesis and crystallization

Refinement