Dilution Effects in a Spin Crossover System, Modelled in Terms of Direct and Indirect Intermolecular Interactions

H. Constant-Machado (1) , J. Linares (1) , F. Varret (1) , J. Haasnoot (2) , J. Martin (3) , J. Zarembowitch (3) , A. Dworkin (3) , Azzedine Bousseksou (4)

1 UVSQ - Université de Versailles Saint-Quentin-en-Yvelines
2 Universiteit Leiden = Leiden University
3 UP11 - Université Paris-Sud - Paris 11
4 LCC - Laboratoire de chimie de coordination

We have studied by 57Fe Mössbauer spectroscopy and magnetic measurements the spin transition exhibited by the series: , consisting of a spin-crossover iron(II) system diluted in a high-spin cobalt(II) matrix. We performed Monte Carlo simulations of the thermal variation of the high-spin fraction, using a two-level Ising-type Hamiltonian. A good agreement with experiment is obtained by the introduction of an indirect interaction of the spin-crossover units via the non-spin crossover unit, the origin of which is discussed in steric terms.

Domaines: Articles anciens

H. Constant-Machado, J. Linares, F. Varret, J. Haasnoot, J. Martin, et al.. Dilution Effects in a Spin Crossover System, Modelled in Terms of Direct and Indirect Intermolecular Interactions. Journal de Physique I, 1996, 6 (9), pp.1203-1216. ⟨10.1051/jp1:1996124⟩. ⟨jpa-00247241⟩