Crystal structures and magnetic properties of linear trinuclear heterometallic complexes based on [(Tp)Fe(CN)(3)](-)

摘要

Using [(Tp)Fe(CN)(3)](-) (Tp = hydrotris(pyrazolyl)borate) as a building block, four trinuclear complexes [M-II(DMSO)(4)][(Tp)Fe(CN)(3)](2) (M-II = Co, 1; Ni, 2; Mn, 3; Cu, 4) (DMSO = dimethyl sulfoxide) have been prepared and their structures and magnetic properties have been studied. Complexes 1-4 are isostructural and crystallize, in which each M-II ion is coordinated by two [(Tp)Fe(CN)(3)](-) moieties through cyano-bridges in trans positions, resulting in a linear trinuclear structure. The magnetic properties of 1-4 have been investigated in the 2-300 K temperature range. Ferromagnetic coupling occurs in cyano-bridged Ni-II-NC-Fe-III, Mn-II-NC-Fe-III and Cu-II-NC-Fe-III while antiferromagnetic exchange is present between Co-II and Fe-III ions. The correlations between the structures and the J values are discussed.