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High-spin -> low-spin relaxation in the two-step spin-crossover compound [Fe(pic)3]Cl2·EtOH (pic = 2-picolylamine)

Romstedt, Harald
Spiering, Hartmut
Published in Journal of Physics and Chemistry of Solids. 1998, vol. 59, no. 2, p. 265-275
Abstract The spin-crossover compound [Fe(pic)3]Cl2EtOH (pic = 2-picolylamine) shows an unusual two-step spin transition. This is thought to be caused by specific nearest-neighbour interactions and short-range correlations and requires a theoretical treatment of the elastic interactions between the spin-changing molecules beyond the mean-field approximation. Such short-range correlations also influence the high-spin → low-spin relaxation following the light-induced population of the high-spin state at cryogenic temperatures, leading to characteristic deviations from the predictions of a mean-field treatment. These deviations are directly observable by comparison of the full and unperturbed relaxation curves with curves for which the short-range correlations were destroyed using an appropriate irradiation technique. Monte Carlo simulations including both nearest-neighbour and long-range interactions give a description of the observed relaxation curves which is consistent with the thermal spin equilibrium.
Keywords Fe(II) compundsHigh spin-low spin relaxationTwo-step spin transition
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Research group Groupe Hauser
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ROMSTEDT, Harald, HAUSER, Andreas, SPIERING, Hartmut. High-spin -> low-spin relaxation in the two-step spin-crossover compound [Fe(pic)3]Cl2·EtOH (pic = 2-picolylamine). In: Journal of Physics and Chemistry of Solids, 1998, vol. 59, n° 2, p. 265-275. doi: 10.1016/S0022-3697(97)00142-X https://archive-ouverte.unige.ch/unige:2764

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Deposited on : 2009-09-21

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