Synthesis and magnetic properties of Fe-Mn-Cr multinuclear complexes with 4-amino-1,2,4-triazole and oxalate ligands

Iis Siti Jahro, Djulia Onggo, A. Ismunandar, Susanto Imam Rahayu, Esther Jacoba Martha Vertelman, Petra Van Koningsbruggen

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)95-99
Number of pages5
JournalJournal of Natural Sciences and Mathematics
Volume11
Issue number3
Publication statusPublished - 2006

Keywords

  • [Fe(NH2trz)3]2+
  • [MnCr(ox)3]n n-
  • magnetic properties
  • spin crossover
  • antiferromagnetic

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