A Dy-2 single-molecule magnet with benzoate anions and phenol-O- bridging groups

作者：Ke Hongshan; Zhang Sheng; Li Xin; Wei Qing; Xie Gang; Wang Wenyuan; Chen Sanping

来源：Dalton Transactions, 2015, 44(48): 21025-21031.

DOI：10.1039/c5dt03607k

A Dy-2 single-molecule magnet, namely [Dy-2(H3L)(2)(PhCOO)(4)]center dot 4H(2)O (1), was obtained from the reaction of Dy(PhCOO)(3) with 1,5-bis(2-hydroxy-3-methoxybenzylidene)carbonohydrazide (H4L). Each Dy-III ion is located in the chelating pocket [DyO8N] formed by the carboxyl-O, phenol-O, carbohydrazide-O and carbohydrazide-N, forming a tricapped trigonal prism configuration. The DyIII centers are bridged by the benzoate anions with mu(2):eta(1),eta(2) coordination mode and the phenol-O-groups in the form of mu(1):eta(2), respectively. The appearance of frequency-dependent out-of-phase (chi '' M) signals indicates that 1 displays singlemolecule magnet (SMM) behaviour. Fits of the ac data gave an energy barrier (U-eff) of 42.7 K with a preexponential factor (tau(0)) of 1.31 x 10(-7) s. The structure-property relationship of some selected Dy-2 paradigmatic compounds was further discussed.

• 出版日期2015
• 单位西北大学