Syntheses, structures and properties of five Cu(II) coordination polymers derived from semi-rigid bis-pyridyl-bis-amide and nitro-substituted aromatic carboxylates

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• 作者：Xiu-Li Wang ; ^{wangxiuli@bhu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Mao Le ; Hong-Yan Lin ; Jian Luan ; Guo-Cheng Liu ; Ji-Yan Shao
• 关键词：Coordination polymer ; Semi-rigid bis-pyridyl-bis-amide ; Nitro-substituted carboxylate ; Crystal structures ; Electrochemical properties
• 刊名：Polyhedron
• 出版年：2015
• 出版时间：24 November 2015
• 年：2015
• 卷：101
• 期：Complete
• 页码：290-298
• 全文大小：3374 K

文摘

Five new coordination polymers (CPs) based on two semi-rigid bis-pyridyl-bis-amide ligands and different nitro-substituted carboxylates, namely [Cu(3,5-dnb)(μ₂-OH)] (rong class="boldFont">1rong>), [Cu₄(4-bpcc)₂(3,5-dnb)₆(μ₃-OH)₂(H₂O)₂] (rong class="boldFont">2rong>), [Cu(4-bpcc)₂(5-Hnip)₂] (rong class="boldFont">3rong>), [Cu₃(4-bpcc)(5-nip)₂(5-Hnip)(μ₃-OH)(H₂O)]·4H₂O (rong class="boldFont">4rong>), and [Cu(3-bpcc)(5-nip)]·2H₂O (rong class="boldFont">5rong>) (3,5-Hdnb = 3,5-dinitrobenzoic acid, 5-H₂nip = 5-nitroisophthalic acid, 4-bpcc = N,N′-bis(4-pyridinecarboxamide)-1,2-cyclohexane, and 3-bpcc = N,N′-bis(3-pyridinecarboxamide)-1,2-cyclohexane), were synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, TG analysis and powder X-ray diffraction. Complex rong class="boldFont">1rong> shows a 3D framework, which features a (3,5)-connected topology with the Schläfli symbol of {3 · 7²}{3² · 7⁵ · 8³}. Complex rong class="boldFont">2rong> displays a 3D supramolecular structure based on the tetranuclear [Cu₄(3,5-dnb)₆(μ₃-OH)₂] clusters, while complex rong class="boldFont">3rong> presents a 3D supramolecular architecture with mononuclear Cu(II) subunits. Complex rong class="boldFont">4rong> was obtained at a higher pH value than that in rong class="boldFont">3rong>, which exhibits a uninodal 5-connected 3D bnn framework constructed from 1D ladder-like chains and μ₂-bridging 4-bpcc ligands. Complex rong class="boldFont">5rong> is a 2D (4,4)-network based on a 1D [Cu(3-bpcc)]_n meso-helixe and a 1D [Cu(5-nip)]_n zigzag chains. The bis-pyridyl-bis-amide ligands and nitro-substituted carboxylates, as well as pH show great influence on the formation and various structures of the title complexes. The fluorescent and electrochemical properties of the title complexes were investigated.