Four New Cd(II) Coordination Polymers with Mixed Multidentate N-Donors and Biphenyl-Based Polycarboxylate Ligands: Syntheses, Structures, and Photoluminescent Properties

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• 作者：Di Sun ; Lu-Lu Han ; Shuai Yuan ; Yong-Kai Deng ; Meng-Zhen Xu ; Dao-Feng Sun
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：January 2, 2013
• 年：2013
• 卷：13
• 期：1
• 页码：377-385
• 全文大小：557K
• 年卷期：v.13,no.1(January 2, 2013)
• ISSN：1528-7505

文摘

Four new cadmium(II) coordination polymers (CPs), {[Cd(Hpptpd)(H₂bptta)]路8H₂O}_n (1), {[Cd₂(Hpptpd)₂(bptta)(H₂O)₂]路4H₂O}_n (2), {[Cd₂(pptpz)(bpta)(H₂O)]路H₂O}_n (3), and {[Cd(Hpptpz)(bpba)]路2H₂O}_n (4) (Hpptpd = 2-(3-(4-(pyridin-4-yl)phenyl)-1H-1,2,4-triazol-5-yl)pyridine, Hpptpz = 2-(3-(4-(pyridin-4-yl)phenyl)-1H-1,2,4-triazol-5-yl)pyrazine, H₄bptta = 3,3鈥?5,5鈥?biphenyltetracarboxylic acid, H₃bpta = 3,4鈥?5-biphenyltricarboxylic acid, H₂bpba = 3,4鈥?biphenylbicarboxylic acid), were synthesized under hydrothermal conditions. The CPs were structurally characterized by single-crystal X-ray diffraction analyses and further characterized by infrared spectra (IR), elemental analyses, powder X-ray diffraction (PXRD), and thermogravimetric analyses (TGA). Complex 1 exhibits an unusual 2D + 2D 鈫?2D parallel interpenetrated 6³-hcb network. The adjacent 2D networks are interdigitated with each other to form the resulting three-dimensional (3D) supramolecular architecture through the interbilayer 蟺路路路蟺 stacking between Hpptpd ligands and nonclassical C鈥揌路路路O hydrogen bonds. Complex 2 is a one-dimensional (1D) molecular ladder along the a direction and further extended via hydrogen bonds into the 3D supramolecular framework. Complex 3 exhibits a novel complicated 3D (3,4,4,5)-connected framework with the Schl盲fli symbol of (4路6⁵)(4路6⁷路8²)(6³)(6⁴路8²). Complex 4 manifests an intriguing layered structure with 5-connected cadmium atom as a unique node and can be simplified to an Archimedean (3³路4⁴路5³) cem topology with triangular and rectangular circuits. The topology of 4 could be alternately simplified to a 3,4-connected binodal layer with a V₂O₅-type network. The thermal stabilities and photoluminescence behaviors of them were also discussed.