Poly[(μ5-cis-cyclohex-4-ene-1,2-dicarboxylato)(μ3-cis-cyclohex-4-ene-1,2-dicarboxylato)dicadmium(II)

Andrew R Laduca,Robert L Laduca

doi:10.1107/s2414314618009240

Andrew R Laduca, Robert L Laduca

Open Access

https://doi.org/10.1107/s2414314618009240

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Abstract

The title compound, [Cd2(C8H8O4)2] n , crystallizes in the centrosymmetric monoclinic P21/n space group. Via cis-cyclohex-4-ene-1,2-dicarboxylate ligands in two different binding modes, square pyramidally and pentagonal bipyramidally coordinated Cd atoms are connected into coordination polymer layer motifs oriented parallel to the ab plane. These layered motifs are aggregated into the three-dimensional supramolecular crystal structure of the title compound by means of crystal packing forces.

Highlights

The title compound, [Cd2(C8H8O4)2]n, crystallizes in the centrosymmetric monoclinic P21/n space group
Via cis-cyclohex-4-ene-1,2-dicarboxylate ligands in two different binding modes, square pyramidally and pentagonal bipyramidally coordinated Cd atoms are connected into coordination polymer layer motifs oriented parallel to the ab plane
These layered motifs are aggregated into the three-dimensional supramolecular crystal structure of the title compound by means of crystal packing forces

Summary

Structure description

The dipodal tethering ligand propane-1,3-diylbis(piperidine-4,1-diyl)bis(pyridin-4-ylmethanone (4-pbpp) has recently proven useful in preparing metal 1,3-thiophenedicarboxylate coordination polymers with intriguing and diverse interpenetrated topologies (Sample & LaDuca, 2016). The title compound was prepared during synthetic attempts to prepare cadmium coordination polymers containing both cis-cyclohex-4-ene1,2-dicarboxylate (chedc) and 4-pbpp ligands. The asymmetric unit of the title compound contains two crystallographically distinct Cd atoms (Cd1, Cd2) and two crystallographically distinct chedc ligands (chedc-A, chedcB) (Fig. 1). The Cd atoms and chedc ligands construct [Cd2(chedcA)(chedc-B)]n ribbon motifs (Fig. 2) that are oriented parallel to the b-axis direction. The ribbon motifs are connected into [Cd2(chedc-A)(chedcB)]n coordination polymer layers (Fig. 3) that are arranged parallel to the ab plane. The inter-ribbon connection is provided by O6 atoms belonging to the chedc-B ligands. Adjacent [Cd2(chedc-A)(chedc-B)]n coordination polymer layer motifs stack in an ABAB pattern along the c-axis direction, related by crystallographic glide planes (Fig. 4).

Synthesis and crystallization

No of parameters

Bruker APEXII CCD diffractometer

Special details