Cooperative high-temperature spin crossover accompanied by a highly anisotropic structural distortion

Il'ya A. Gural'skiy, Bohdan O. Golub, Sergii I. Shylin, Vadim Ksenofontov, Helena J. Shepherd, Paul R. Raithby, Wolfgang Tremel, Igor O. Fritsky

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Spin transitions are a spectacular example of molecular switching that can provoke extreme electronic and structural reorganizations in coordination compounds. A new 3D cyanoheterometallic framework, [Fe(pz)(Au(CN)2)2], has been synthesized in which a highly cooperative spin crossover has been observed at 367 and 349 K in heating and cooling modes, respectively. Mössbauer spectroscopy revealed a complete transition between the diamagnetic and paramagnetic states of the iron centres. The low-spin-to-high-spin transition induced a drastic structural distortion involving a large one-directional expansion (ca. 10.6%) and contraction (ca. 9.6%) of the lattice. Negative thermal expansion along the c axis was detected below and above the transition temperature.

Original languageEnglish
Pages (from-to)3191-3195
JournalEuropean Journal of Inorganic Chemistry
Issue number19
Early online date19 May 2016
Publication statusPublished - Jul 2016


  • Cooperative effects
  • Iron
  • Magnetic properties
  • Metal-organic frameworks
  • Spin crossover


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