Oxalate‐Based 3D Chiral Magnets: The Series [Z^II(bpy)₃][ClO₄][M^IIFe^III(ox)₃] (Z^II = Fe, Ru; M^II = Mn, Fe; bpy = 2,2'‐Bipyridine; ox = Oxalate Dianion)

Abstract

The synthesis, structure, and physical properties of the oxalate-based molecular magnets with the formula [

Increasing the Ordering Temperatures in Oxalate-Based 3D Chiral Magnets: the Series [Ir(ppy)2(bpy)][MIIMIII(ox)3]·0.5H2O (MIIMIII = MnCr, FeCr, CoCr, NiCr, ZnCr, MnFe, FeFe); bpy = 2,2‘-Bipyridine; ppy = 2-Phenylpyridine; ox = Oxalate Dianion)

“…The magnetic properties of the M II Fe III compounds indicate the presence of antiferromagnetic exchange interactions (Figure ). This behavior is analogous to that observed in the series [Z II (bpy) 3 ][ClO 4 ][M II Fe(ox) 3 ] (M II = Mn and Fe; Z II = Fe and Ru) . Above ca.…”

“…Another interesting result obtained in this family is the presence of a thermal spin transition in [Co(bpy) 3 ][LiCr(ox) 3 ] . From the magnetic point of view, the chiral compounds leading to ordered magnetic phases are the homometallic series [M II M II ] that behave as antiferromagnets or weak ferromagnets and the bimetallic series [M II M III ] reported by our group that behave as ferro-, weak ferro-, and ferrimagnets as the analogous 2D compounds but with lower ordering temperatures. , This lower ordering temperature indicates that, despite the higher dimensionality of this type of compounds, they present weaker magnetic exchange interactions due to the different relative orientation of the magnetic orbitals and also to the longer metal-to-metal distances.…”

EPR and magnetization studies on single crystals of a heterometallic (CuII and CrIII) complex: Zero-field splitting determination

“…In that sense, a widely used ligand is the oxalate C 2 O 2− 4 anion -not only because of the influence it has in transmitting electronic effects between magnetic centres, but also because of its extraordinary rich binding facilities [2]. The use of stable mononuclear anionic oxalate complexes, [M III (C 2 O 4 ) 3 ] 3− (M III = Cr, Fe, Ru), as ligands toward other metal ions provides an efficient route for the synthesis of heteropolynuclear oxalate-bridged species of different nuclearity and dimensionality, and with a variety of magnetic properties [3][4][5].…”

Heptacoordinated MnIIin oxalate-based bimetallic 2D magnets: synthesis and characterisation of [Mn(L)6][Mn(CH3OH)MIII(ox)3]2(MIII= Cr, Rh; ox = oxalate dianion; L = H2O, CH3OH)

“…The versatility of the oxalate ligand to form magnetic coordination polymers, have also allowed for the preparation of bimetallic networks of higher dimensionality, where cations with the appropriate size and geometry act as templates for the construction of 3D host structures. In this way, chiral octahedral cations of the [Z(bpy) 3 ] 2+ type (bpy = 2,2 -bipyridine) promote the formation of chiral cubic 3D structures, 20 that also behave as ferro-, ferrior weak ferromagnets in the series [Z II (bpy 23 When organic radicals of the nitronyl nitroxide type are used instead, a more complex 3D structure is obtained with predominant antiferromagnetic interactions. 24 The dimensionality of these polymeric networks can also be reduced, and less connected 2D lattices 25 and even 1D chains 26 have been obtained more recently.…”