Desolvation-induced magnetic switching from single-ion magnetism to spin-crossover in a halogen-functionalized cobalt(II) complex

Shao，Dong1,4; Ruan，Zhijun1; Dong，Jing1; Huang，Long1; You，Maolin2; Yang，Jiong3; Shi，Le5

2023-12-15

10.1016/j.molstruc.2023.136548

Journal of Molecular Structure   Impact Factor & Quartile

0022-2860

The switching between spin-crossover (SCO) and single-ion magnet (SIM) are fascinating because the process provides potential in-depth understating of different bistability. Herein, we present a rare example of the desolvation-induced magnetic switching from single-ion magnetism to SCO between a halogen-functionalized cobalt(II) complex, [Co(Brphtpy)](PF)·2MeOH (Brphtpy = 4′-(4-Bromophenyl)-2,2′:6′,2′'-terpyridine, 1·2MeOH) and its desolvated material of [Co(Brphtpy)](PF) (1). The temperature-dependent magnetic susceptibility and variable-temperature single crystal X-ray diffraction results show a high spin state of the Co(II) ions in 1·2MeOH. At lower temperature, frequency- and temperature-dependent slow magnetic relaxation behaviors were evidenced under an applied dc field of 1000Oe, originating from the easy-plane magnetic anisotropy (D=43.5 cm) of Co(II) ions. After the release of methanol molecules, interestingly, the desovated material 1 display a complete and cooperative two-step spin transitions with transition temperatures being 350 and 125K. Differential scanning calorimetry measurements support the stepwise SCO behavior and reveal the related ΔH and ΔS.

Cobalt(II) Magnetic switching Phase transformation Single-ion magnet Spin-crossover

English

Others

Huanggang Normal University[202210204];Natural Science Foundation of Hubei Province[2023AFB010];Huanggang Normal University[2042021033];

CHEMISTRY

2-s2.0-85169831849

Scopus

1.Hubei Key Laboratory of Processing and Application of Catalytic Materials,College of Chemistry and Chemical Engineering,Huanggang Normal University,Huanggang,438000,China
2.Department of Chemistry,National University of Singapore,Singapore,117543,Singapore
3.Department of Chemistry,Southern University of Science and Technology (SUSTech),Shenzhen,518055,China
4.State Key Laboratory of Coordination Chemistry,Nanjing University,Nanjing,210023,China
5.Stoddart Institute of Molecular Science,Zhejiang University,Hangzhou,310027,China

Shao，Dong,Ruan，Zhijun,Dong，Jing,et al. Desolvation-induced magnetic switching from single-ion magnetism to spin-crossover in a halogen-functionalized cobalt(II) complex[J]. Journal of Molecular Structure,2023,1294.

Shao，Dong.,Ruan，Zhijun.,Dong，Jing.,Huang，Long.,You，Maolin.,...&Shi，Le.(2023).Desolvation-induced magnetic switching from single-ion magnetism to spin-crossover in a halogen-functionalized cobalt(II) complex.Journal of Molecular Structure,1294.

Shao，Dong,et al."Desolvation-induced magnetic switching from single-ion magnetism to spin-crossover in a halogen-functionalized cobalt(II) complex".Journal of Molecular Structure 1294(2023).