Divalent metal ions modulated strong frustrated M(ii)–Fe(iii)3O (M = Fe, Mn, Mg) chains with metamagnetism only in a mixed valence iron complex†
Abstract
Linking magnetically frustrated triangular FeIII3O units by divalent metal ions (MII = FeII for 1, MnII for 2) gives isostructural 1D spin chains. Strong antiferromagnetic interactions were found in these complexes with significant frustrations but very interesting ferrimagnetic like transition and metamagnetism were found in mixed valence 1. By comparing the magnetic behaviours with isostructural complex 3 (with MII = MgII), it is proposed that the spins of FeII ions and MnII ions have ferromagnetic and antiferromagnetic contributions respectively.