Structural chemistry and selective CO2 uptake of a piperazine-derived porous coordination polymer

Chris Samuel Hawes, Keith White, Brendan Francis Abrahams, Gregory Paul Knowles, Alan Loyd Chaffee, Stuart Robert Batten, David Roger Turner

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9 Citations (Scopus)


A new piperazine-derived ligand has been prepared and used to synthesise a porous coordination polymer which displays selective carbon dioxide uptake after solvent exchange and thermal activation. The ligand N,N′-bis(4-carboxyphenylmethylene)piperazine H2L1 was prepared from piperazine in three steps and good yield. A structure containing the deprotonated form K2L1·2H2O was determined and consists of a three-dimensional coordination polymer containing inorganic K2(COO)2(OH2) layers separated by the long organic bridging linker. The free compound H2L1 displays a one-dimensional hydrogen-bonded polymeric structure in the solid state with hydrogen bonding interactions between carboxylic acids and piperazine groups tightly linking molecules together. The two-dimensional polymeric complex [Zn3(L1)2(OH)2]·2DMF·0.5H2O 1 was prepared and analysed in the solid state to reveal tubular one-dimensional channels which, when activated by solvent exchange and evacuation, displayed selective affinity for CO2 over N2 and H2
Original languageEnglish
Pages (from-to)2196-2203
Number of pages8
Issue number10
Publication statusPublished - 2015

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