1-D coordination chains of Cu(hfac)2 and Mn(hfac)2 bridged by phenyl-nitronylnitroxide derivatives

Two alternating 1-D metal-radical linear [L:Cu(hfac)2]n and zig-zag [L:Mn(hfac)2]n chains (where L = 4-trimethylsilylethynyl-1-(4,4,5,5-tetramethyl-3-oxylimidazoline-1-oxide)benzene) and hfac = hexafluoroacetylacetonate) are described and characterized by X-ray diffraction of their crystals. Bulk magnetic measurements of L:Cu(hfac)2 indicated a ferromagnetic interaction with J = 6 cm−1 and L:Mn(hfac)2 yielded ferrimagnetic interactions with J = −95 cm−1. For the latter, a strong increase of their magnetic moment at lowest temperatures was observed only at very low static magnetic field, while for Hdc > 0.05 T saturation effect led to a downward slope after reaching a maximum.