X‐ray Structure and Magnetic Properties of Two New Iron(II) 1D Coordination Polymers with Bis(imidazolyle)methane as Bridging Ligand

Abstract

AbstractThe reaction of iron(II) acetate with the tetradentate Schiff base like ligands H2L1 ((E,E)‐[{diethyl 2,2′‐[1,2‐phenylenebis(iminomethylidyne)]bis[3‐oxobutanato]) and H2L2 ([3,3′]‐[1,2‐phenylene‐bis(iminomethylidyne)]bis(2,4‐pentane‐dionato)‐N,N′,O2,O2′]) leads to the formation of the octahedral N2O4 coordinated iron complexes [FeL1(MeOH)2] and [FeL2(MeOH)2], respectively. Conversion of both with bimm (bis(1‐imidazolyle)methane) leads to the 1D coordination polymers [FeL1(bimm)]·0.5MeOH (1) and [FeL2(bimm)] (2). Compound 1 is a pure high‐spin (HS) complex, which was characterised by using magnetic measurements and X‐ray structure analysis. Compound 2 undergoes an irregular and incomplete thermal spin transition.