Heteroleptic Iron(III) Spin Crossover Complexes; Ligand Substitution Effects
نویسندگان
چکیده
Heteroleptic iron(III) complexes of formula [Fe(qsal-Cl)(thsa)] ̈nMeCN have been synthesized; [Fe(qsal-Cl)(thsa)] ̈MeCN, 1 and [Fe(qsal-Cl)(thsa)], 2. The latter can be obtained by slow evaporation of solutions of compound 1 under ambient conditions, a rare occurrence in nonporous compounds. 1 interestingly shows a unique magnetic profile over the de-solvation temperature range, 300-350 K, in the first cycle, and becomes stable after the third cycle with a hysteresis width of about 20 K. Different de-solvation techniques used on compound 1 give rise to various stable de-solvated phases. Consequently, distinct magnetic profiles, with a larger hysteresis width of about 30 K, are present. Cl substitution on the qsal ́ ligand introduces C–H ̈ ̈ ̈Cl and P4AE interactions into the structure which are absent in the related unsubstituted compound, [Fe(qsal)(thsa)] ̈0.5MeCN, 3. Comparisons in structural packing, as well as spin crossover properties between unsubstituted and Cl-substituted ligand compounds, are discussed.
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