Synthesis, crystal structure, and magnetic properties, of a Cu(II) solid state compound derived from the 3,4,9,10-perylenetetracarboxylate anion and diethylenetriammine (abstract)

Abstract

Several strategies have been used to develop novel magnetic materials. One of these is the simultaneous use of at least two different ligands, one an oxygen donor and the other a nitrogen donor. With this approach, using the optically interesting oxygen donor, 3,4,9,10-perylenetetracarboxylate anion (petca), and the tridentate nitrogen donor ligand, diethylenetriamine (dien), we recently reported1 the synthesis of the solid state Cu(II) compound, [Cu5(dien)5(petca)2H2O4] (ClO4)2⋅2H2O (1). This compound contains three different copper species, a chain [Cu2 (dien)2(petca)n, a dimer [Cu2(dien)2(petca)(H2O)2] and a monomer [Cu(dien)(H2O)2] and several exchange pathways. We wish to report, that the dimeric units in 1 have been isolated. The structure of the compound [Cu2(dien)2(petca)H2O)2]⋅13H2O (2), has been determined by an x-ray single-crystal diffraction study. Two different dimers are present in the unit cell: isolated dimer units, surrounded by water molecules; and dimers connected through hydrogen bonds in a way that resembles the chains in 1. In both cases, the Cu(II) ion is coordinated to one oxygen from the petca anion, the three nitrogen atoms of the dien, and a water molecule, in a nearly square planar geometry. The magnetic properties of this compound relate to these structural features.