Field-induced single-ion magnet behaviour of a hexacoordinated Co(ii) complex with easy-axis-type magnetic anisotropy
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TUPOLOVA, Yu.; SHCHERBAKOV, Igor; POPOV, Leonid; LEBEDEV, Vladimir; TKACHEV , Valerii; ZAKHAROV, Konstantin; VASILIEV, Alexander; KORCHAGIN, Denis; PALII, Andrew; ALDOSHIN, Serghei. Field-induced single-ion magnet behaviour of a hexacoordinated Co(ii) complex with easy-axis-type magnetic anisotropy. In: Dalton Transactions. 2019, nr. 20(48), pp. 6960-6970. ISSN 1477-9226.
10.1039/c9dt00770a
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Dalton Transactions
Numărul 20(48) / 2019 / ISSN 1477-9226 /ISSNe 1477-9234

Field-induced single-ion magnet behaviour of a hexacoordinated Co(ii) complex with easy-axis-type magnetic anisotropy


DOI: 10.1039/c9dt00770a
Pag. 6960-6970

Tupolova Yu.1, Shcherbakov Igor1, Popov Leonid1, Lebedev Vladimir1, Tkachev Valerii2, Zakharov Konstantin3, Vasiliev Alexander345, Korchagin Denis2, Palii Andrew26, Aldoshin Serghei2
 
1 Southern Federal University, Rostov-on-Don,
2 Institute of Problems of Chemical Physics, Russian Academy of Sciences,
3 Lomonosov Moscow State University,
4 National University of Science and Technology ―MISiS, Moscow,
5 South Ural State University,
6 Institute of Applied Physics
 
Disponibil în IBN: 12 iunie 2019


Rezumat

A coordination compound with the composition [CoLCl 2 ]·H 2 O (L = bis-condensation product of diacetyl and 2-hydrazinyl-4,6-dimethylpyrimidine) was synthesized, in which the Co(ii) ion was hexacoordinated. Under applied DC fields, this compound exhibited single-ion magnet behavior. Two relaxation processes were observed when increasing the applied magnetic field from 1000 to 3200 Oe. The first relaxation (high-frequency) was observed both at 1000 Oe and 3200 Oe, while the second relaxation was only registered under a field of 3200 Oe at low frequencies (<1 Hz) and low temperatures (<5 K). Modeling of the magnetic DC properties using the Griffith Hamiltonian accompanied by quantum chemical calculations revealed easy-axis-type magnetic anisotropy with weak rhombic contributions.

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<title xml:lang='en'><p>Field-induced single-ion magnet behaviour of a hexacoordinated Co(ii) complex with easy-axis-type magnetic anisotropy</p></title>
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<description xml:lang='en' descriptionType='Abstract'><p>A coordination compound with the composition [CoLCl <sub>2</sub> ]&middot;H <sub>2</sub> O (L = bis-condensation product of diacetyl and 2-hydrazinyl-4,6-dimethylpyrimidine) was synthesized, in which the Co(ii) ion was hexacoordinated. Under applied DC fields, this compound exhibited single-ion magnet behavior. Two relaxation processes were observed when increasing the applied magnetic field from 1000 to 3200 Oe. The first relaxation (high-frequency) was observed both at 1000 Oe and 3200 Oe, while the second relaxation was only registered under a field of 3200 Oe at low frequencies (&lt;1 Hz) and low temperatures (&lt;5 K). Modeling of the magnetic DC properties using the Griffith Hamiltonian accompanied by quantum chemical calculations revealed easy-axis-type magnetic anisotropy with weak rhombic contributions.</p></description>
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