Two Carboxylato-bridged Binuclear Cobalt(II) Complexes Pillared Coligands: Synthesis,Structures and Magnetic Properties

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摘要 By adopting mixed-ligand strategy, two Co(II) coordination polymers, [Co(phda)(itmb)(H2O)2]n (1) and [Co(phda)(Hpytz)]n (2) (H2phda = 1,2-phenylenediacetate, itmb = 1-(imidazo-1-ly)-4-(1,2,4-triazol-1-yl methyl) benzene and Hpytz = 3,5-di(4-pyridyl)-1,2,4-triazolate), were hydrothermally synthesized and then characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. The single-crystal X-ray diffraction reveals that two complexes feature carboxylato-bridged binuclear subunits extended further by the nitrogen-rich coligands to form different structures. Complex 1 containing phda-bridged binuclear cobalt is developed by itmb coligand to 1D double-stranded chain, whereas complex 2 exhibits 2D open bilayers, which result from the ribbon-like carboxylate chains pillared Hpytz coligands. In addition, the magnetic susceptibilities of both compounds were measured over the temperature range of 3～300 K, and the data were analyzed well using MagSaki software. The best fitting parameters were κ = 0.98, λ = −100 cm-1, ∆ = 588 cm-1 and J = 0.6 cm-1 for complex 1 and κ = 0.86, λ = −110 cm-1, ∆ = 756.8 cm-1 and J = −1.25 cm-1 for complex 2. The results indicate the existence of weaker ferromagnetic interaction for complex 1 and antiferromagnetic interaction for complex 2 between the metal centers in the dinuclear metal units.

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	辛凌云
	李晓玲
	尹卫东
	刘广臻

关键词 ： mixed-ligand, complexes, synthesis, structures, magnetic properties

Abstract：By adopting mixed-ligand strategy, two Co(II) coordination polymers, [Co(phda)(itmb)(H2O)2]n (1) and [Co(phda)(Hpytz)]n (2) (H2phda = 1,2-phenylenediacetate, itmb = 1-(imidazo-1-ly)-4-(1,2,4-triazol-1-yl methyl) benzene and Hpytz = 3,5-di(4-pyridyl)-1,2,4-triazolate), were hydrothermally synthesized and then characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. The single-crystal X-ray diffraction reveals that two complexes feature carboxylato-bridged binuclear subunits extended further by the nitrogen-rich coligands to form different structures. Complex 1 containing phda-bridged binuclear cobalt is developed by itmb coligand to 1D double-stranded chain, whereas complex 2 exhibits 2D open bilayers, which result from the ribbon-like carboxylate chains pillared Hpytz coligands. In addition, the magnetic susceptibilities of both compounds were measured over the temperature range of 3～300 K, and the data were analyzed well using MagSaki software. The best fitting parameters were κ = 0.98, λ = −100 cm-1, ∆ = 588 cm-1 and J = 0.6 cm-1 for complex 1 and κ = 0.86, λ = −110 cm-1, ∆ = 756.8 cm-1 and J = −1.25 cm-1 for complex 2. The results indicate the existence of weaker ferromagnetic interaction for complex 1 and antiferromagnetic interaction for complex 2 between the metal centers in the dinuclear metal units.

Key words： mixed-ligand complexes synthesis structures magnetic properties

收稿日期: 2019-06-20 出版日期: 2020-05-14

基金资助:This work was supported by the National Natural Science Foundation of China (No. 21571093) and Colleges and Universities Key Scientific Research Project of Henan Province (No. 18B150016)

通讯作者: gzliuly@126.com E-mail: gzliuly@126.com

引用本文:

辛凌云;李晓玲;尹卫东;刘广臻;. Two Carboxylato-bridged Binuclear Cobalt(II) Complexes Pillared Coligands: Synthesis,Structures and Magnetic Properties[J]. 结构化学, 2020, 39(5): 933-941.
XIN Ling-Yun; LI Xiao-Ling;YIN Wei-Dong;LIU Guang-Zhen. Two Carboxylato-bridged Binuclear Cobalt(II) Complexes Pillared Coligands: Synthesis,Structures and Magnetic Properties. CHINESE JOURNAL OF STRUCTURAL CHEMISTRY, 2020, 39(5): 933-941.

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http://manu30.magtech.com.cn/jghx/CN/ 或 http://manu30.magtech.com.cn/jghx/CN/Y2020/V39/I5/933

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