Raman and nuclear inelastic scattering study of the lattice dynamics of the Fe(H2B(pz)(2))(2)(phen) spin crossover complex

Sylvain Rat (1, 2) , Mirko Mikolasek (1, 2) , José Sánchez Costa (1, 2) , A. I. Chumakov (3) , William Nicolazzi (1, 2) , Gábor Molnár (1) , L. Salmon (1) , Azzedine Bousseksou (1)

1 LCC - Laboratoire de chimie de coordination
2 UT3 - Université Toulouse III - Paul Sabatier
3 ESRF - European Synchrotron Radiation Facility

We report on a combined nuclear inelastic scattering and metal isotope substitution based Raman spectroscopic investigation of lattice dynamics changes associated with the spin transition in the ferrous complex [Fe(H2B(pz)(2))(2)(phen)] (pz = pyrazolyl, phen = 1,10-phenantroline). These techniques allowed us to identify Raman active metal - ligand stretching vibrations in the high spin (v(HS) = 232 cm(-1)) and low spin (v(LS) = 390 cm(-1)) states as well as to calculate associated changes of the Debye temperature (Theta(HS)(D) = 140 K, Theta(LS)(D) = 146 K), Debye sound velocity (v(HS) = 1282 m/s, v(LS) = 1300 m/s) and Young's modulus (E-HS = 4.7 GPa, E-LS = 5.2 GPa).

Domaines: Chimie de coordination

Sylvain Rat, Mirko Mikolasek, José Sánchez Costa, A. I. Chumakov, William Nicolazzi, et al.. Raman and nuclear inelastic scattering study of the lattice dynamics of the Fe(H2B(pz)(2))(2)(phen) spin crossover complex. Chemical Physics Letters, 2016, 653, pp.131-136. ⟨10.1016/j.cplett.2016.04.014⟩. ⟨hal-01934975⟩