The Lead Coordination Polymers Containing Pyrazine-2,3-Dicarboxylic Acid: Rapid Structural Transformations and Cation Exchange
Document Type
Article
Publication Date
1-1-2015
Abstract
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-slow evaporation method with optimized conditions. It crystallizes in the C2/m space group (a = 11.561(1) Å, b = 8.4327(7) Å, c = 11.792(1) Å, β = 126.3070(8)°), 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) Å, b = 12.0268(9) Å, c = 13.9430(8) Å), whereas the rapidly formed 3D compound, Pb2.67Co0.33(pzdc)3(H2O) (3), crystallizes in the P21/n space group (a = 10.9665(7) Å, b = 8.1909(4) Å, c = 25.0238(1) Å, β = 91.593(5)°). 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.
Keywords
Chlorine compounds, Cobalt compounds, Dimers, Doping (additives), Lead, Polymers, Positive ions, Solutions
Divisions
CHEMISTRY
Funders
HIR Chancellory Grant UM.C/625/1/HIR/211 from the University of Malaya
Publication Title
Crystal Growth & Design
Volume
15
Issue
12
Publisher
American Chemical Society