Dinuclear Cu(II) complexes of isomeric bis-(3-acetylacetonate)benzene ligands: synthesis, structure, and magnetic properties |
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Authors: | Rancan Marzio Dolmella Alessandro Seraglia Roberta Orlandi Simonetta Quici Silvio Sorace Lorenzo Gatteschi Dante Armelao Lidia |
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Institution: | Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche and Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, Dipartimento di Scienze Chimiche, Università di Padova, Via F. Marzolo, 1-35131, Padova, Italy. marzio.rancan@unipd.it |
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Abstract: | 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 ?). |
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