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Temperature induced magnetic bistability in a crystal of tetrachlorosemiquinone anion radical (CROSBI ID 185879)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Molčanov, Krešimir ; Kojić-Prodić, Biserka ; Babić, Darko ; Pajić, Damir ; Novosel, Nikolina ; Zadro, Krešo Temperature induced magnetic bistability in a crystal of tetrachlorosemiquinone anion radical // Crystengcomm, 14 (2012), 7958-7964. doi: 10.1039/c2ce25893e

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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Podaci o izdanju

14

2012.

7958-7964

objavljeno

1466-8033

10.1039/c2ce25893e

Povezanost rada

Fizika, Kemija

Poveznice
Indeksiranost