Synthesis and Magnetic Properties of a Fe-Mn-Cr Multinuclear Complex with 4-Amino-1,2,4-triazole and Oxalate Ligands
Abstract: A multinuclear
Fe-Mn-Cr complex with 4-amino-1,2,4-triazole (NH 2 trz) and oxalate (ox)
ligands has been synthesized successfully. The formula of the [Fe(NH 2 trz) 3
][ClO 4 ][MnCr(ox) 3 ].4H 2 O complex has been obtained based on the metal and
C, H, N contents. The presence of water molecules, metal-ligand bonding and
bridge ligand in the multinuclear complex has been confirmed by its infrared
spectrum. The compound crystallizes in the hexagonal system with cell parameters
of a = b = 18.695 Å and c = 57.351 Å. The compound shows a gradual spin
crossover for iron(II) in the [Fe(NH 2 trz) 3 ] 2+ with transition temperature
(T 1/2 ) of 205 K. The antiferromagnetic interaction between Cr(III) and Mn(II)
ions in the [MnCr(ox) 3 ] n n- network is observed from the Weiss constant (θ)
of –2.3 K.
Keywords: [Fe(NH 2 trz) 3 ] 2+
, [MnCr(ox) 3 ] n n- , Magnetic properties, Spin crossover, Antiferromagnetic
Author: Iis Siti Jahro, Djulia
Onggo, Ismunandar, Susanto Imam Rahayu, Esther Jacoba Martha Vertelman, Petra
van Koningsbruggen
Journal Code: jpkimiagg060003
