The Lead Coordination Polymers Containing Pyrazine-2,3-Dicarboxylic Acid: Rapid Structural Transformations and Cation Exchange

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• 作者：Fendi Y. Wardana ; Seik-Weng Ng ; Arief C. Wibowo
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：December 2, 2015
• 年：2015
• 卷：15
• 期：12
• 页码：5930-5938
• 全文大小：624K
• ISSN：1528-7505

文摘

A new Pb-based coordination polymer synthesized with pyrazine-2,3-dicarboxylic acid (H₂pzdc) is reported along with its structural characterizations. The compound, Pb₂Cl₂(Hpzdc)₂(H₂O)₂ (1), is synthesized using a simple, aqueous-based dissolution鈥搒low evaporation method with optimized conditions. It crystallizes in the C2/m space group (a = 11.561(1) 脜, b = 8.4327(7) 脜, c = 11.792(1) 脜, 尾 = 126.3070(8)掳), with a 1D coordination polymer consisting of Pb₂Cl₂ dimers with monoprotonated dicarboxylic acids located between the chains. Soaking 1 in an aqueous solution of Hg(II) or Co(II) at room temperature resulted in a structural transformation into a newly formed 2D or 3D structure, respectively. The 2D compound, Pb(pzdc)(H₂O) (2), crystallizes in the Pbca space group (a = 9.2624(9) 脜, b = 12.0268(9) 脜, c = 13.9430(8) 脜), whereas the rapidly formed 3D compound, Pb_2.67Co_0.33(pzdc)₃(H₂O) (3), crystallizes in the P2₁/n space group (a = 10.9665(7) 脜, b = 8.1909(4) 脜, c = 25.0238(1) 脜, 尾 = 91.593(5)掳). A structure similar to 3 without any dopant, Pb₃(pzdc)₃(H₂O) (3a), is also synthesized. A rapid, room-temperature cation exchange is also observed when soaking 1 into an aqueous solution of Cu(II), giving a known structure. Systematic studies on the syntheses and characterizations of 1 and its remarkably rapid structural transformations and cation exchange at room temperature are presented.