Synthesis, spectroscopic investigations, X-ray crystallographic studies and magnetic properties of heterobimetallic Fe(II)–Hg(II) polynuclear complexes

Two novel heterometallic complexes with Hg(II) and Fe(II) as coordination centres have been synthesised and characterised by means of infrared, single crystal X-ray diffraction and magnetic measurements. The compounds FeHg(SCN)4(C3H7NO)2 (FMTF) and FeHg(SCN)4(N2H4CS)4 (TMTF) form supramolecular framework structures. The FMTF adopts a multidimensional structure, while TMTF creates a one-dimensional chain extending along the crystallographic direction [0 0 1]. Variable temperature magnetic susceptibility measurements show different degrees of deviation from Curie modelled behaviours. In both salts, large zero field splitting mainly contributes to their downturns, while in TMTF, the antiferromagnetic interactions within the chains should also be taken into account.