Single-Molecule Magnetism in a Pentacoordinate Cobalt(II) Complex Supported by an Antenna Ligand

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• 作者：Cyril Rajn谩k ; J谩n Titi拧 ; Olaf Fuhr ; Mario Ruben ; Roman Bo膷a
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：August 18, 2014
• 年：2014
• 卷：53
• 期：16
• 页码：8200-8202
• 全文大小：242K
• ISSN：1520-510X

文摘

Pentacoordinate complex [CoL³Cl₂] with a tridentate antenna-like ligand L³ forms a dimer held by short 蟺鈥撓€ stacking with head-to-head contacts at 3.4 脜. The direct-current (dc) magnetic susceptibility and magnetization data confirm weak ferromagnetic interaction and a large-magnetic anisotropy, D/hc = 150 cm^鈥? and E/hc = 11.6 cm^鈥?. The system shows superparamagnetic behavior at low temperature that depends upon the applied magnetic field. At B_dc = 0.2 T, a low-frequency peak at the out-of-phase susceptibility is seen (谓 0.3 Hz), whereas the onset of the second peak appears at 谓 > 1500 Hz, indicating the existence of two slow relaxation processes.