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Privault, G., Mevellec, J.-Y., Lorenc, M., Humbert, B., Janod, E., Daro, N., Chastanet, G., Subedi, A. & Collet, E. (2022) Symmetry-Resolved Study of Lattice Vibration and Libration Modes in [Fe(phen)(2)(NCS)(2)] Crystal. Crystal Growth & Design, 22 5100–5109. 
Added by: Richard Baschera (2022-08-19 07:08:10)   Last edited by: Richard Baschera (2022-08-19 07:28:56)
Type de référence: Article
DOI: 10.1021/acs.cgd.2c00659
Numéro d'identification (ISBN etc.): 1528-7483
Clé BibTeX: Privault2022
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Catégories: IMN, INTERNATIONAL, PMN
Créateurs: Chastanet, Collet, Daro, Humbert, Janod, Lorenc, Mevellec, Privault, Subedi
Collection: Crystal Growth & Design
Consultations : 4/160
Indice de consultation : 13%
Indice de popularité : 3.25%
Liens URLs     https://doi.org/10.1021/acs.cgd.2c00659
Résumé     
In the family of spin-crossover materials, which undergo thermal conversion between low-spin (LS) and high-spin (HS) phases, it is of great interest to study vibrational modes. On the one hand, vibration modes are characteristic of the spin state, and vibrational spectroscopies are often used for monitoring spin-state switching driven by temperature, pressure, or light. On the other hand, spin-state thermal conversion is an entropy-driven process, and the vibrational entropy change represents the main contribution to the total entropy difference between LS and HS phases at solid state. However, the discussion of vibrations in spin-crossover materials is often limited at the molecular scale. Here we study vibration modes in the [Fe(phen)2(NCS)2] crystal, and we compare symmetry-resolved vibrational spectroscopy data performed on single crystal to density functional theory calculations performed in a periodic three-dimensional crystal. We discuss the complex nature of vibrational modes in crystals, including the vibration of molecules within the crystalline lattice, with different symmetries and frequencies. We also highlight the presence of many low-frequency libration modes of different symmetries. The contribution of vibrational entropy, added to the electronic entropy, provides a total entropy difference in the solid state, which is in very good agreement with calorimetric measurements.
  
Notes     
Publisher: American Chemical Society
  
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