Formation, structures and magnetic properties of M(hfac)2 (M = Cu or Mn) complexes of 4-amino-TEMPO and its derivative

The reactions of TEMPO derivatives having a benzylideneamine unit with Cu(hfac)₂ revealed unexpected formation of a complex consisting of 4-amino-TEMPO and Cu(hfac)₂ and its crystal structure and magnetic properties showed marked difference from those of the corresponding Mn(hfac)₂ complex and a complex derived from bis-TEMPO-substituted-ethylenediamine