A New Nitronyl Nitroxide Radical as Building Blocks for a Rare S=13/2 High Spin Ground State 2p-3d Complex and a 2p-3d-4f Chain

作者：Yao, Binling; Guo, Zhilin; Zhang, Xuan; Ma, Yue^*; Yang, Zhenhao; Wang, Qinglun; Li, Licun; Cheng, Peng

来源：Crystal Growth & Design, 2017, 17(1): 95-99.

DOI：10.1021/acs.cgd.6b01276

• CRYSTAL POLYMERIZATION-DEPOLYMERIZATION
• CONTINUOUS SYMMETRY MEASURES
• STABLE FREE-RADICALS
• MAGNETIC-PROPERTIES
• MOLECULAR MAGNETS
• MAGNETOSTRUCTURAL TRANSITIONS
• COORDINATION
• COPPER(II)
• COMPOUND
• LIGANDS

A new nitronyl nitroxide radical L (L = 2-(4-(5-methyl-carbonyl-3-pyriyl)benzoxo)4,4,5,5-tetramethylimidazo-line-1-oxyl-3-oxide) containing N-O groups and the pyridyl nitrogen group was designed and synthesized a multidentate ligand to obtain compounds with interesting structures and magnetic properties from 3d or 3d-4f precursors. The reaction of Cu(hfac)(2) and/or Gd(hfac)(3)center dot 2H(2)O (hfac = hexafluoroace-tylacetonate) with L resulted in a rare S = 13/2 high spin ground state Cu-II complex [(Cu(hfac)(2))(7)(L)(6)] (1) and a Cu-II Gd-III chain complex [Gd(hfac)(3)Cu(hfac)(2)(L)(2)](n)center dot 0.5CH(2)Cl(2) (2). Single crystal X-ray diffraction studies indicate that the N-O groups of the L radicals are all axially bound to Cu-II ions in complex 1, which result in the ferromagnetic exchange between Cull and radicals and an S. = 13/2, high spin ground state. While adding Gd(hfac)3 units to the system of Cu(hfac)2 and L radical, a one dimension chain structure is obtained, and there are ferromagnetic Gd-III-radical interactions and antiferromagnetic radical radical coupling in the chain.

• 出版日期2017-1
• 单位南开大学