New magnetic behaviour of honeycomb layered compounds. Crystal structures of [M2(bipym)(N3)4](M = CoII, FeII; bipym = 2,2′-bipyrimidine)

Abstract

A one-pot reaction of Co(NO₃)₂·6H₂O or FeCl₂, 2,2′-bipyrimidine (bipym) and NaN₃ affords the two [M₂-(bipym)(N₃)₄](M = Co^II 1, Fe^II 2) honeycomb sheetlike compounds with alternating double end-on azide and bis(chelating) bipym bridging groups; magnetic susceptibility measurements indicate that they exhibit ferromagnetic (through the end-on azide) and antiferromagnetic (through bipym) magnetic interactions, their magnetization studies revealing the occurrence of metamagnetic like behaviour.