MAGNETIC AND STRUCTURAL STUDY OF UNSOLVATED [Cu(acac)2], (acac= acetylacetonate)

This work is the first of a series of studies on systems with a common basic structure, Cu-b-diketonate, whose ability to bind to other ligands is regulated by the presence of electron-withdrawing groups affecting the electronic density on the copper ion. In this paper the [Cu (acac)(2)] system is studied. Its structure reveals discrete units linked through H bridges (c.a. 2.7 angstrom). The crystallographic system and space group, are monoclinic and P21/ n respectively; the cell parameters are a = 10.34 angstrom, b = 4.71 angstrom, c = 11.38 angstrom, beta = 91.78. The magnetic behaviour corresponds to a simple paramagnetism with mu = 1.8 [BM]; however, a weak antiferromagnetic interaction is observed at lower temperatures.