By using rationally-selected metal ions (or clusters) and well-designed organic ligands, their self-assembly process can be manipulated and the precise disposition of coordination links can be imposed to obtain a great variety of metal-organic architectures with a significant degree of predictability. Multifunctional ligands pave the way for more elaborate structures such as heterometallic assemblies, and are also useful for combining metal-ligand bonding with other relatively weak, non-covalent interactions. Against this background, we synthesized a series of pyridyl-acetylacetonate bifunctional ligands. They can be denoted as py–C≡C–C6H4–acacH in which py and acacH represent the N-containing heterocycle (i.e. 2, 3, or 4-pyridyl group) and centrally-substituted acetylacetone, respectively. The metal binding ability of acac− and py functionalities has been explored with selected di- and tri-valent transition metal ions, and crystal structures of several discrete and polymeric compounds will be presented. As the ligands possess inequivalent binding sites, their suitability for mixed-metal systems and for possible hydrogen- and halogen-bonding interactions is also addressed.

Coordination chemistry of extended pyridyl-acetylacetonate ligands

255th National Meeting (2018)

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