Magnetic studies of metal ion coordination clusters encapsulated with thiacalixarene

Three thiacalix[4]arene polynuclear complexes have been prepared by literature methods for detailed magnetic investigation. The [Fe₃O(L)₂] (LH₄ = thiacalix[4]arene) complex is found to exhibit interesting anti-ferromagnetic exchange coupling. Jahn–Teller distortion in [Cu₄(L)₂] complex leads to strong anti-ferromagnetic coupling at low temperatures. The temperature-dependent susceptibility of the [(μ-H₂O)Eu₂(LH)₂(DMF)₄] complex is well described by a ground state involving the thermal population of the lowest three excited states.