Synthesis, Structure, and Magnetic Properties of Cu(hfac) 2 Polymeric Complexes with Cyanophenyl-Substituted Nitroxyls

Spirocyclopentyl derivatives of cyanophenyl-substituted nitroxyl radicals (2-(4′-cyanophenyl)-4,5-bis(spirocyclopentyl)-4,5-dihydro-1 H -imidazole-3-oxide-1-oxyl (NN) and the corresponding iminonitroxyl 2-(4′-cyanophenyl)-4,5-bis(spirocyclopentyl)-4,5-dihydro-1 H -imidazole-1-oxyl (IN)) are synthesized; their structure and magnetic properties are studied. Interaction of IN and NN with bis(hexafluoroacetylacetonato) copper(II) [Cu(hfac) 2 ] leads to the formation of heterospin chain polymeric {[Cu(hfac) 2 ] 2 (IN)}, {[Cu(hfac) 2 ] 3 (NN) 2 }, and layered {[Cu(hfac) 2 ] 3 (NN) 2 }·C 7 H 16 complexes. It is shown that the layered {[Cu(hfac) 2 ] 3 (NN) 2 }·C 7 H 16 is a soft ferromagnet that transforms into a magnetically ordered state at helium temperatures.