Copper-nitroxide coordination polymers with CrB4 topology.

Preparation, crystal structures, and magnetic properties of two mixed-ligand copper-nitroxide complexes Cu(diket)L^t-Bu are reported (diket = hexafluoroacetylacetonato, trifluoroacetylacetonato; HL^t-Bu = 1-(1-oxyl-2,2,5,5-tetramethyl-imidazolidin-4-ylidene)-3,3-dimethyl-butan-2-one). The molecules of the complexes behave as pseudotetrahedral tectons and form a 3D structure having the topology of boron network in CrB₄. [ABSTRACT FROM AUTHOR]