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Two novel coordination compounds containing heterocyclic bidentate N , N -donor ligand 2-(furan-2-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (fpo) were synthesized. A general formula for compounds originating from perchlorates of iron, cobalt, and fpo can be written as: [M(fpo) 2 (H 2 O) 2 ](ClO 4 ) 2 (M = Fe(II) for ( 1 ) Co(II) for ( 2 )). The characterization of compounds was performed by general physico-chemical methods-elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) in case of organics, and single crystal X-ray diffraction (sXRD). Moreover, magneto-chemical properties were studied employing measurements in static field (DC) for 1 and X-band EPR (Electron paramagnetic resonance), direct current (DC), and alternating current (AC) magnetic measurements in case of 2 . The analysis of DC magnetic properties revealed a high spin arrangement in 1 , significant rhombicity for both complexes, and large magnetic anisotropy in 2 ( D = -21.2 cm -1 ). Moreover, 2 showed field-induced slow relaxation of the magnetization ( U  eff = 65.3 K). EPR spectroscopy and ab initio calculations (CASSCF/NEVPT2) confirmed the presence of easy axis anisotropy and the importance of the second coordination sphere.

The Structural and Magnetic Properties of FeII and CoII Complexes with 2-(furan-2-yl)-5-pyridin-2-yl-1,3,4-oxadiazole