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The X-ray single crystal structures of an acid-functionalized bis(2-picolyl)amine (bpa) ligand with Palladium(II) and Zinc(II) display different intermolecular interactions around the common (H2O)2(anion)2 motif

This work reports structural investigations on two metal complexes of the functionalized (p-carboxylatobenzyl)-bis(2-picolyl)amine ligand 1 (HL). The complex {; ; [HLPdCl]Cl × H2O}; ; 2 (2Pd) has a square-planar coordination around the Pd ion. It forms discrete dimers by intermolecular hydrogen bonding involving the protonated ligand HL. The coordination around the Zn2+ ion in {; ; [(H2O)LZn]CF3SO3 × 2 H2O}; ; (3Zn) is best described as distorted trigonal-bipyramidal. The N3O2 ligand sphere is composed of three nitrogen atoms from the bpa ligand, one water molecule, and a carboxylate oxygen atom from a neighbouring molecule, thus forming infinite chains along the crystallographic a axis. Further intermolecular interactions are based on the same (H2O)2(anion)2 motif as for 2Pd, but whereas the former forms discrete dimers, 3Zn forms a more complicated two-dimensional coordination polymer with additional intermolecular hydrogen bonds.

palladium; zinc; bis(2-picolyl)amine; coordination polymers

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