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All Journal Jurnal Matematika & Sains
Esther Jacoba Martha Vertelman
Stratingh Institute of Chemistry and Chemical Engineering, University of Groningen
Mathematics

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Synthesis and Magnetic Properties of a Fe-Mn-Cr Multinuclear Complex with 4-Amino-1,2,4-triazole and Oxalate Ligands Iis Siti Jahro; Djulia Onggo; Ismunandar Ismunandar; Susanto Imam Rahayu; Esther Jacoba Martha Vertelman; Petra van Koningsbruggen
Jurnal Matematika & Sains Vol 11, No 3 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

A multinuclear Fe-Mn-Cr complex with 4-amino-1,2,4-triazole (NH2trz) and oxalate (ox) ligands has been synthesized successfully. The formula of the [Fe(NH2trz)3][ClO4][MnCr(ox)3].4H2O 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(NH2trz)3]2+ with transition temperature (T1/2) 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.
Co-Authors Djulia Onggo Iis Siti Jahro Ismunandar Petra van Koningsbruggen Susanto Imam Rahayu