A 2D [FeII-bistetrazole] coordination polymer exhibiting spin-crossover properties

Manuel Quesada, Ferry Prins, Olivier Roubeau, Patrick Gamez, Simon J. Teat, Petra J. van Koningsbruggen, Jaap G. Haasnoot, Jan Reedijk

Research output: Contribution to journalArticlepeer-review


The reaction of 1,3-bis(tetrazol-1-yl)-2-propanol (btzpol) with Fe(BF4)2 · 6H2O in acetonitrile yields the remarkable 2D coordination polymer [FeII(btzpol)1.8(btzpol-OBF3)1.2](BF4)0.8 · (H2O)0.8(CH3CN) (1). This compound has been structurally characterized using an X-ray single-crystal synchrotron radiation source. The iron(II) centers are bridged by means of double btzpol bridges along the c direction, and by single btzpol bridges along the b direction. The reaction of part of the ligand with the counterion has forced the compound to crystallize in this extended two dimensional structure. The compound shows spin-transition properties, both induced by temperature and light, with T½ = 112 K and T(LIESST) = 46 K, respectively. The relaxation of the metastable high-spin state created by irradiation is exponential, following an Arrhenius type behavior at high temperature, and dominated by a temperature independent tunneling process at lower temperatures.

Original languageEnglish
Pages (from-to)3787-3796
Number of pages10
JournalInorganica Chimica Acta
Issue number13
Early online date14 Dec 2006
Publication statusPublished - 1 Oct 2007


  • iron(II)
  • spin-transition
  • azole ligands
  • metal-organic framework
  • relaxation


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