Abstract
The magnetic and structural properties of three gradual spin transition monomeric compounds based on the cation [Fe(Hpt) 3] 2+ (Hpt=3-(pyrid-2-yl)-1,2,4-triazole) are presented. The non-cooperative character of the spin-crossover in [Fe(Hpt) 3](BF 4) 2·2H 2O ( I) is evaluated in light of its calorimetric properties, which yielded the thermodynamic values Δ trs H=5.81 kJ mol −1 and Δ trs S=39.5 J mol −1 K −1. The light-induced excited spin-state trapping effect is performed on [Fe(Hpt) 3](BF 4) 2·2H 2O ( I) and [Fe(Hpt) 3](SO 4) 0.4(BF 4) 1.2·3H 2O ( II), and the subsequent HS→LS relaxations are studied. Their merely first-order kinetics are affected by disorder in the structure of both complexes, which appears in the presence of a distribution of activation energies. HS species can also be frozen-in in I by rapid cooling. Continuous irradiation is shown to induce only apparent light-induced thermal hysteresis effect in I and II, stemming from slow kinetics of relaxation with respect to the kinetics of measurement.
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