Unusual oxidation states of lanthanides and Group 3 metals have recently drawn attention for their structures and magnetic properties arising from their 4f electronic configurations. The complexes Y(NHAr)2Cl (1) and Dy(NHAr)2Cl (2), where Ar = a substituted 2,6-triaryl, were synthesized by salt metathesis and showed h6-arene 3-legged piano-stool geometries. Upon reduction, complexes 1 and 2 gave room-temperature stable arene sandwich complexes Y(NHAr)2 (3) and Dy(NHAr)2 (4). Interestingly, EPR spectroscopy on complex 3 indicates that the unpaired electron is delocalized over the ligand that interacts with the metal center. Reaction of 4 with [FeCp2][BArF24] gave dysprosium(III) [Dy(NH2Ar)2][BArF24](5). In this talk, the synthesis, structure, spectroscopy, and reactivity of the complexes will be discussed. In addition, the effects of ligand orientation on magnetic properties of the complexes. The ligands create an axial field around the metal center and the molecule can behave as a single-molecule magnet.

Synthesis, structure, and properties of mononuclear Y(II) and Dy(II) complexes

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