Insertion of a Spin Crossover FeIII Complex into an Oxalate-Based Layered Material: Coexistence of Spin Canting and Spin Crossover in a Hybrid Magnet

The syntheses, structures, and magnetic properties of the compounds of formula Fe (III)(sal 2trien) 2Mn (II) 2(ox) 3.4H 2O.C 3H 7NO ( 1) and In (III)(sal 2trien) 2Mn (II) 2(ox) 3.3H 2O.CH 3OH (2) are reported. The structure presents a homometallic 2D honeycomb anionic layer formed by Mn (II) ions linked through oxalate ligands and a cationic double layer of Fe(sal 2trien) (+) or In(sal 2trien) (+) complexes intercalated between the 2D oxalate network. The magnetic properties and Mössbauer spectroscopy of 1 indicate the coexistence of a magnetic ordering of the Mn(II) oxalate network that behaves as a weak ferromagnet and a gradual spin crossover of the intercalated Fe(sal 2trien) (+) complexes.