Metal‐Sensitive Hydrothermal Synthesis and Structural Characterization of a Mixed‐Metal and Porous Coordination Polymer Containing 2,3‐Pyridinedicarboxylate |
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| Authors: | Chia‐Hung Yen Fen‐Ling Liao Kom‐Bei Shiu |
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| Institution: | 1. Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, R.O.C.;2. Instrument Center, National Tsing‐Hua University, Hsinchu 300, Taiwan, R.O.C. |
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| Abstract: | The hydrothermal reaction of 2,3‐pyridinedicarboxylic acid (2,3‐H2pda) with a mixture of Cd(NO3)2 and Ni(NO3)2 afforded a coordination polymer, CdNi(2,3‐pda)2(H2O)3]∞ ( 1 ); in contrast, that with a mixture of Cd(NO3)2 and Zn(NO3)2 surprisingly produced a discrete molecule, trans‐Cd(3‐pa)2(H2O)4] ( 2 ) (3‐pa? = 3‐pyridinecarboxylate). Since a direct reaction between a single metal salt, Cd(NO3)2 or Zn(NO3)2, and 3‐pyridinecarboxylic acid (3‐Hpa) under similar hydrothermal conditions yielded different coordination polymers containing 3‐pa?, it appears that the apparently thermal decarboxylation from ligated 2,3‐pda2? to 3‐pa? occurs after complexation of both metal cations, Cd(II) and Zn(II). A new coordination mode, formed for 2,3‐pda2? in structure 1 , appears to help formation of microporous channels by piling up the observed 2D hydrogen‐bonded heteropolynuclear layers. Each channel apparently consists of two interpenetrating 63 Cd(II) and Ni(II) nets. |
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| Keywords: | Pyridinedicarboxylate Pyridinecarboxylate Coordination polymer Structure |
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