Temperature induced magnetic bistability in a crystal of tetrachlorosemiquinone anion radical (CROSBI ID 185879)
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Podaci o odgovornosti
Molčanov, Krešimir ; Kojić-Prodić, Biserka ; Babić, Darko ; Pajić, Damir ; Novosel, Nikolina ; Zadro, Krešo
engleski
Temperature induced magnetic bistability in a crystal of tetrachlorosemiquinone anion radical
The anion radicals with nonaromatic π–systems, such as semiquinones, are interesting in the design of functional materials. Magnetic properties of solvates of alkali salts of tetrachlorosemiquinone (chloranil) radical anion are tuned by crystal engineering using different solvents (2-butanone and acetonitrile) and/or cations (potassium and ammonium) in crystals. The structural and magnetic characteristics of two salts were studied by variable-temperature single crystal X-ray diffraction and magnetic susceptibility measurements. DFT and CAS-MP2 calculations were used to correlate magnetic and structural properties of radical anions. The solid-state structure of potassium tetrachlorosemiquinone 2-butanone solvate, influenced by temperature, switches between a paramagnetic-like monomeric radical form at high temperature (200 K) and diamagnetic dimeric one at low temperature (100 K). The reversible transition is controlled by solvent and cation types which affect intrastack distance and magnetic properties.
semiquinone radical anion; phase transition; reversible; spin-Peierls transition; spin coupling; antiferromagnetism; paramagnetism; crystal engineering; π–stacking
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