Spin Crossover in Transition Metal Compounds III

Volume 235 of the series Topics in Current Chemistry pp 84-103

The Role of Molecular Vibrations in the Spin Crossover Phenomenon

  • Jean-Pierre TuchaguesAffiliated withLaboratoire de Chimie de Coordination, CNRS UPR 8241 Email author 
  • , Azzedine BousseksouAffiliated withLaboratoire de Chimie de Coordination, CNRS UPR 8241
  • , Gábor MolnárAffiliated withLaboratoire de Chimie de Coordination, CNRS UPR 8241
  • , John J. McGarveyAffiliated withSchool of Chemistry, Queen’s University Belfast
  • , François VarretAffiliated withLaboratoire de Magnétisme et d’Optique de Versailles, CNRS UMR 8634

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The prominent role of intra- and inter-molecular vibrations in the spin crossover phenomenon is outlined, based on the results obtained by the spin crossover community. The experimental results gained from various techniques (IR, Raman, X-ray diffraction, heat capacity, Mössbauer spectroscopy, synchrotron radiation techniques, etc.) and their interpretation are described. The contribution of theoretical models (thermodynamic and Ising-like electro-vibrational models) to the understanding of the relationship between the relative energies of the high-spin and low-spin states and molecular vibrations, especially when the high-spin and low-spin energy levels are close to each other, is stressed.


Spin crossover Spin-state equilibrium Vibrational properties Molecular vibrations Lattice dynamics Mass effect Isotope substitution IR and Raman spectroscopy Synchrotron radiation techniques Ising-like microscopic model Ising-like electro-vibrational model Macroscopic thermodynamic model