Cooperative spin transition in a 1D-polymeric complex [Fe(4-ethyl-1,2,4-triazole)3]SiF6·nH2O

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Abstract

A new 1D-polymeric iron(II)-1,2,4-triazole complex, [Fe(EtTrz)3]SiF6·nH2O (EtTrz = 4-ethyl-1,2,4-triazole, n = 1, 0), demonstrates cooperative spin transition above room temperature. Under vacuum the complex loses its water molecules and shows an abrupt and reproducible spin transition with thermal hysteresis, Tc↑ ≈ 345 K, Tc↓ ≈ 328 K, ΔH ≈ 20 kJ mol−1, ΔS ≈ 57 J mol−1 K−1. In sealed ampoules the complex [Fe(EtTrz)3]SiF6·H2O shows the spin transition with a narrower hysteresis loop, Tc↑ ≈ 363 K, Tc↓ ≈ 353 K, ΔH ≈ 30 kJ mol−1, ΔS ≈ 85 J mol−1 K−1. A composite spin crossover material can be prepared by embedding the complex in the polymeric polystyrene matrix.

Original languageEnglish
Article number119560
Number of pages7
JournalInorganica Chimica Acta
Volume506
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • Cooperativity
  • Iron
  • Spin crossover
  • Triazole
  • 4-R-1,2,4-TRIAZOLES R
  • COMPOSITE
  • 1,2,4-TRIAZOLE
  • COORDINATION-COMPOUNDS
  • IRON(II) COMPLEXES
  • (1)A(1)-REVERSIBLE-ARROW-T-5(2)
  • CROSSOVER
  • MAGNETIC-PROPERTIES
  • TRINUCLEAR
  • HTRZ=1,2,4-TRIAZOLE

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