Two Mononuclear Tri‐Spin Compounds based on the Lanthanide‐Nitronyl Nitroxide Radicals: Synthesis, Crystal Structure, and Magnetic Properties

Two Ln III complexes based on a nitronyl nitroxide radical were synthesized and characterized structurally and magnetically: [ Ln (hfac) 3 [NITPh m ‐Cl] 2 ][0.5CH 3 (CH 2 ) 5 CH 3 ] [ Ln = Er ( 1 ), Nd ( 2 )] [hfac = hexafluoroacetylacetonate, NITPh m ‐Cl = 2‐(3′‐chlorophenyl)‐4, 4,5, 5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide]. X‐ray crystal structure analysis revealed that the two complexes have similar mononuclear tri‐spin structures, in which the metal ions are octacoordinated by two radicals and three hfac molecules to form a slightly distorted dodecahedral arrangement. Each tri‐spin unit connects through intermolecular hydrogen bonds, resulting in the formation of one‐dimensional wave‐like chain. Both of the complexes form a one‐dimensional structure by intermolecular hydrogen bonds. Variable temperature magnetic susceptibility measurements studies revealed that there are antiferromagnetic interactions between the paramagnetic ions ( Ln III and radical).