Abstract

In the title compound, [Cd2(C9H6O5)2(H2O)2] n , the crystallographically distinct CdII cations are coordinated in pentagonal–bipyramidal and octahedral fashions. The 2-(carboxymethoxy)benzoate (cmb) ligands connect the Cd atoms into [Cd2(cmb)2(H2O)2)] n coordination polymer ribbons that are oriented along the a-axis direction. Supramolecular layers are formed parallel to (01\overline{1}) by O—H...O hydrogen bonding between the ribbons. The supramolecular three-dimensional crystal structure of the title compound is then constructed by π–π stacking interactions with a centroid–centroid distance of 3.622 (2) Å between cmb ligands in adjacent layer motifs.

Highlights

  • In the title compound, [Cd2(C9H6O5)2(H2O)2]n, the crystallographically distinct CdII cations are coordinated in pentagonal–bipyramidal and octahedral fashions

  • The 2-(carboxymethoxy)benzoate ligands connect the Cd atoms into [Cd2(cmb)2(H2O)2)]n coordination polymer ribbons that are oriented along the a-axis direction

  • The title compound was isolated during an exploratory synthetic effort aiming to produce a cadmium coordination polymer containing both 2-(carboxymethoxy)benzoate and 4-pyridylisonicotinamide (4-pina) ligands

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Summary

Structure description

The title compound was isolated during an exploratory synthetic effort aiming to produce a cadmium coordination polymer containing both 2-(carboxymethoxy)benzoate (cmb) and 4-pyridylisonicotinamide (4-pina) ligands. The Cd1 atoms display a {CdO7} distorted pentagonal–bipyramidal geometry with one bound water molecule in an axial position and another bound water molecule in the equatorial plane. A cmb-A ligand provides three O atom donors, two in equatorial positions and one in the other axial position. A chelating carboxylate group from a cmb-B ligand occupies the final two coordination positions at Cd1. The nominal axial positions are taken up by single carboxylate O atom donors from two different cmb-B ligands. The nominal equatorial plane at Cd2 contains a chelating carboxylate group from a third cmb-B ligand, a single carboxylate O atom donor from a fourth cmb-B ligand, and a single carboxylate O atom donor from a cmb-A ligand.

DÁ Á ÁA
No of parameters
Bruker APEXII CCD diffractometer
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