The structure and properties of a 3D pillared-layered metal organic framework Cu(II)-diphosphonate

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• 作者：Xiao-Min Zhao ; Kui-Rong Ma ; ^{kuirongma@163.com} ; Yu Zhang ; Xiao-Jing Yang ; Ming-Hui Cong
• 关键词：Cu(II)-diphosphonate-4 ; 4&prime ; -bipy MOF ; Crystal structure ; Fluorescence ; Magnetism
• 出版年：2012
• 期刊代码：40_00201693
• 类别：ch
• 出版时间：15 June, 2012
• 卷：388
• 期：Complete
• 页码：33-36
• 文件大小：511 K

摘要

By introducing the second bridging ligand, 4,4鈥?bipyridyl (4,4鈥?bipy), the first 3D example of a Cu(II)-diphosphonate-4,4鈥?bipy metal organic framework (MOF), [Cu₃(L)(4,4-bipy)(OH)₂] 1 (H₄L = H₂O₃P(C₆H₄)₂PO₃H₂) was hydrothermally obtained and characterized through powder X-ray diffraction, elemental analysis, IR, and TG-DSC. Single-crystal X-ray diffraction revealed that compound 1 has a 3D MOF structure which is created by a 2D inorganic layer [Cu₃O₆P₂]_n through 4,4鈥?bipy and an organic biphenyl moiety of H₄L linkages. In the structure, an inorganic layer and two organic pillars were alternately arranged. The results of fluorescence measurements revealed two decayed emission bands centered at 442 and 374 nm (位_ex = 236 nm) may be caused by the intraligand 蟺^{鈭?/sup>-蟺 emission states of the 4,4鈥?bipy ligand (位_em = 442 and 381.5 nm, 位_ex = 236 nm). Magnetism analysis indicated antiferromagnetic interactions between the metal centers within the 1D magnetic chain {-Cu(1)-Cu(2)-Cu(2)-Cu(1)-}_n.}