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

Abstract

A new Pb-based coordination polymer synthesized with pyrazine-2,3-dicarboxylic acid (H 2 pzdc) is reported along with its structural characterizations. The compound, Pb 2 Cl 2 (Hpzdc) 2 (H 2 O) 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 Pb 2 Cl 2 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)(H 2 O) (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, Pb 2.67 Co 0.33 (pzdc) 3 (H 2 O) (3), crystallizes in the P2 1 /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, Pb 3 (pzdc) 3 (H 2 O) (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.

Syntheses, Characterization, and Fluorescence Properties of Four Divalent Lead Coordination Polymers based on Zwitterionic Ligands

“…The central Pb 2+ ion is six connected by four μ 2 ‐Cl – anions and two carboxylic oxygen atoms. The Pb–Cl bond lengths vary from 2.742(4) Å to 3.267(4) Å that are comparable with those reported in Pb‐based coordination polymers . The Pb–O bond lengths are 2.529(7) and 2.699(7) Å, which are typically observed in Pb‐based coordination polymers .…”

Design and synthesis of coordination polymers with chelated units and their application in nanomaterials science

“…As an example of a simple water-based method of solutionslow evaporation, we shall consider synthesis of Pb-based CP with [Pb 2 Cl 2 (HL) 2 ] n unit, where H 2 L ¼ pyrazine-2,3-dicarboxylic acid, under optimized conditions. 127 In the same way, the CP with [Pb 3 L 3 ] n unit is obtained without any additives. Reactions between Zr(IV) salt and Pp-tetracarboxylic acid lead to MOF with two types of open channels presenting MOF distinguished by (4,8)-connected sqc network.…”

“…Based on elemental analysis, Co and Ni were more efficiently incorporated into MOF-74 framework from solution than Mg was. In addition, temperature of the reaction has stronger effect on the nal composition of metal in these mixed metallic MOF-74 structures than a solvent composition of the reaction.Fast room-temperature cation exchange is also observed during soaking of CP with [Pb 2 Cl 2 (HL) 2 (H 2 O) 2 ] n unit based on pyrazine-2,3-dicarboxylic acid (H 2 L) in Cu(II) aqueous solutions (Scheme 22) 127.…”

Metal‐ion‐dependent, Solvent‐mediated Structural Transformation and Simultaneous Partial Transmetalation of an srs Framework into Desulfurization‐efficient Co‐Cu‐HKUST‐1

“…[9,10] Another kind of indirect synthetic method called solvent-mediated structural transformation involves the dissolution of the initial frameworks and subsequent formation of new frameworks under the help of newly introduced molecules and/or ions. [11][12][13][14][15][16][17][18] Among few reports about solvent-mediated structural transformation with simultaneous transmetalation, incomplete transmetalation [19] is rarer than complete transmetalation. [20][21][22][23][24][25] efficient desulfurization adsorbent as the homometallic Cu-HKUST-1 in removing thiophene (0.142 mmol S per gram of adsorbent).…”