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 bisacetylacetonate 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 Å).

Dinuclear Cu(II) Complexes of Isomeric Bis-(3-acetylacetonate)benzene Ligands: Synthesis, Structure, and Magnetic Properties / Marzio Rancan;Alessandro Dolmella;Roberta Seraglia;Simonetta Orlandi;Silvio Quici;Lorenzo Sorace;Dante Gatteschi;Lidia Armelao. - In: INORGANIC CHEMISTRY. - ISSN 0020-1669. - STAMPA. - 51:(2012), pp. 5409-5416. [10.1021/ic3003806]

Dinuclear Cu(II) Complexes of Isomeric Bis-(3-acetylacetonate)benzene Ligands: Synthesis, Structure, and Magnetic Properties

SORACE, LORENZO;GATTESCHI, DANTE;
2012

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 bisacetylacetonate 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 Å).
2012
51
5409
5416
Marzio Rancan;Alessandro Dolmella;Roberta Seraglia;Simonetta Orlandi;Silvio Quici;Lorenzo Sorace;Dante Gatteschi;Lidia Armelao
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/639498
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