Our group is developing new formamidine ligands that possess substituents capable of binding additional metal ions. Work by Cotton and others have shown that formamindinates are versatile ligands for stabilizing a wide range of metal-metal bonded complexes. These complexes typically adopt the familiar paddle wheel geometry common among dimetal tetracarboxylate complexes. Our goal is to replace the typical aryl groups with pyridyl substituents. It is anticipated that these pyridyl groups will provide additional donor sites in order to link the individual paddlewheel complexes through complexation with other metal ions. To this end we have have successfully prepared and structurally characterized di-3-pyridyl-formamidine (HD-3-pyF). Reaction of HD-3-pyF with PdCl2 via slow diffusion produces the dipalladium compound [Pd2(HD-3-pyF)4?Cl]Cl3. An X-ray crystal structure reveals that the pyridyl groups of the four formamidine ligands coordinate to the two Pd2+ centers creating a cage like structure that has encapsulated a non-coordinated Cl- ion. The formamidine nitrogens are directed outward and form a hydrogen bonded network with the remaining chloride ions. Details about the synthesis, characterization, and reactivity of this novel complex will be presented.

Synthesis and characterization of [Pd2(HD-3-pyF4?Cl]Cl3: A new chloride ion inclusion complex

247th National Meeting (2014)

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