Palladium(II) complexes with symmetrical dihydroxy-2,2′-bipyridine ligands: Exploring their inter- and intramolecular interactions in solid-state

The structures of complexes [PdCl2{3,3′-(OH)2-2,2′-bipy}] (1), [PdCl2{4,4′-(OH)2-2,2′-bipy}] (2), [PdCl2{5,5′-(OH)2-2,2′-bipy}] (3) and [PdCl2{6,6′-(OH)2-2,2′-bipy}] (4) were determined by means of X-ray diffraction studies, employing in all cases crystals grown from DMF solutions. We have found that, depending on the exact location of the OH groups on the 2,2′-bipyridine skeleton, the chloride ligands are forced to interact with different C(sp2)-hydrogens of the bipy ligands in neighboring molecules, and these intermolecular interactions seem to govern the formation of the corresponding networks. In general, the OH groups interact by H-bonding with DMF molecules of crystallization or other OH groups, thus completing the crystals.

Graphical abstractA study of the inter- and intramolecular interactions present in the solid state structures of the square-planar Pd(II) complexes [PdCl2{3,3′-(OH)2-2,2′-bipy}], [PdCl2{4,4′-(OH)2-2,2′-bipy}], [PdCl2{5,5′-(OH)2-2,2′-bipy}] and [PdCl2{6,6′-(OH)2-2,2′-bipy}] is discussed.Figure optionsDownload full-size imageDownload as PowerPoint slide