14181-22-7Relevant articles and documents
Dinuclear Cu(II) complexes of isomeric bis-(3-acetylacetonate)benzene ligands: Synthesis, structure, and magnetic properties
Rancan, Marzio,Dolmella, Alessandro,Seraglia, Roberta,Orlandi, Simonetta,Quici, Silvio,Sorace, Lorenzo,Gatteschi, Dante,Armelao, Lidia
scheme or table, p. 5409 - 5416 (2012/06/16)
Highly versatile coordinating ligands are designed and synthesized with two β-diketonate groups linked at the carbon 3 through a phenyl ring. The rigid aromatic spacer is introduced in the molecules to orient the two acetylacetone units along different angles and coordination vectors. The resulting para, meta, and ortho bis-(3-acetylacetonate)benzene ligands show efficient chelating properties toward Cu(II) ions. In the presence of 2,2′-bipyridine, they promptly react and yield three dimers, 1, 2, and 3, with the bis-acetylacetonate unit in bridging position between two metal centers. X-ray single crystal diffraction shows that the compounds form supramolecular chains in the solid state because of intermolecular interactions. Each of the dinuclear complexes shows a magnetic behavior which is determined by the combination of structural parameters and spin polarization effects. Notably, the para derivative (1) displays a moderate antiferromagnetic coupling (J = -3.3 cm-1) along a remarkably long Cu???Cu distance (12.30 A).
