Synthesis,Crystal Structure,and Catalytic Properties of Porous 3d‐4f Heterometallic Coordination Polymers Constructed from Pyrazine‐2,3‐dicarboxylic Acid |
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| Authors: | Ting‐Hai Yang Ana Rosa Silva Lianshe Fu Fa‐Nian Shi |
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| Affiliation: | 1. School of Chemistry & Environmental Engineering, Jiangsu University of Technology, Changzhou, P. R. China;2. Department of Chemistry, CICECO‐Aveiro Institute of materials, University of Aveiro, Aveiro, Portugal;3. Department of Physics, CICECO‐Aveiro Institute of materials, University of Aveiro, Aveiro, Portugal;4. School of Science, Shenyang University of Technology, Shenyang, P. R. China |
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| Abstract: | Reactions of pyrazine‐2,3‐dicarboxylic acid (H2pzdc), cobalt nitrate and lanthanide (Ln) oxide under hydrothermal conditions result in four new 3d‐4f heterometal coordination polymers, namely, [Ln2Co(pzdc)4(H2O)6] · 2H2O [Ln = La ( 1 ), Pr ( 2 ), Eu ( 3 ) and Gd ( 4 )]. All compounds were characterized by elemental analysis, infrared spectroscopy, thermal gravimetric analysis, and X‐ray diffraction. The compounds exhibit a three‐dimensional (3D) brick‐like structure with rectangular‐shaped nano‐scale channels along a axis direction, made up of wave‐like layers containing [Ln(pzdc)]+ units, which are connected by one‐dimensional (1D) chain of [Co(pzdc)2]2–. The catalytic properties of compounds 1 and 3 were investigated in the synthesis of cyanohydrins at room temperature under solventless conditions. They showed similar catalytic activities with very high conversions of benzaldehyde and high selectivity towards cyanohydrin. The control experiment without addition of the coordination polymers only reached 16 % conversion. Other aldehydes could also be converted totally under shorter reaction times also with very high selectivities for the corresponding cyanohydrins. Compound 1 could also be recycled in another catalytic cycle. |
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| Keywords: | Pyrazine‐2,3‐dicarboxylic acid Heterometal coordination polymers Cobalt Lanthanides Catalytic properties |
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