Rare examples of diphenoxido-bridged trinuclear NiII2FeIII complexes with a reduced salen type Schiff base ligand: Structures and magnetic properties

摘要: Abstract Three new trinuclear hetero-metallic complexes, [(NiLR)2Fe(N3)3] (1), [(NiLR(H2O))2Fe(C6H5CH2CO2)2]·(HSO4) (2) and [(NiLR(H2O))2Fe(C6H5CO2)2]·(HSO4)·(H2O)·(CH2Cl2) (3) have been synthesized using [NiLR] as a “metalloligand” (where H2LR = N,N′-bis(2-hydroxybenzyl)-1,3-propanediamine). All complexes characterized by elemental analysis, spectroscopic methods, single crystal XRD magnetic study. In the angular units of 1, two terminals coordinate through double phenoxido bridges to central FeIII ion which is penta-coordinated having terminally coordinated azide ion. The terminal NiII centers are connected each other also neighbouring μ1,3-azido form an alternating chain. On hand, 2 3 linear discrete species [NiII–FeIII–NiII] in octahedral ion, located on crystallographic centre symmetry, μ2-phenoxido oxygen atom bridging carboxylato Variable temperature susceptibility measurements show presence antiferromagnetic exchange interactions 1 mediated (J1 = −33.2 cm−1,) μ1,3-N3 (J2 = −19.9 cm−1 J3 = −16.7 cm−1). compounds ferromagnetic coupling with J values +4.9 +3.0 cm−1 for 3, respectively.