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首页> 外文期刊>Crystal growth & design >Zn-MOFs containing flexible α,ω-alkane (or alkene)- dicarboxylates and 1,2-bis(4-pyridyl)ethane ligands: CO_2 sorption and photoluminescence
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Zn-MOFs containing flexible α,ω-alkane (or alkene)- dicarboxylates and 1,2-bis(4-pyridyl)ethane ligands: CO_2 sorption and photoluminescence

机译：含有柔性α，ω-烷烃（或烯烃）-二羧酸盐和1,2-双（4-吡啶基）乙烷配体的Zn-MOF：CO_2吸附和光致发光

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摘要

The use of five flexible α,ω-alkane (or alkene)-dicarboxylates (succinate (2), fumarate (3), adipate (5), and muconate (6)) produced three-dimensional (3-D) Zn~(II) frameworks with 1,2-bis(4-pyridyl)ethane pillars, whereas glutarate gave a two-dimensional (2-D) Zn~(II) compound (4). Structures 2 and 5 are 4-fold interpenetrated networks, and 3 and 6 are 5-fold interpenetrated networks. Both 5 and 6 displayed good CO_ 2 sorption capabilities at 196 K, as evidenced by S-shape adsorption isotherms. Both compounds also exhibited selective CO_2 sorption over N_2 at low temperature, while 5 containing an adipate ligand showed higher CO_2 uptake at 273 and 298 K than 6 with a more rigid muconate ligand. The isosteric heats of CO_2 adsorption for 5 and 6 were 23.1 kJ mol~(-1) and 30.7 kJ mol~(-1), respectively. A photoluminescence study showed the emissions of 2, 4, and 5 to be blue-shifted relative to both the free acids and ligand, while 3 had ligand-based luminescence properties. The thermal stabilities of these complexes were also examined.
机译：使用五种柔性α，ω-烷烃（或烯烃）-二羧酸盐（琥珀酸酯（2），富马酸酯（3），己二酸酯（5）和粘康酸酯（6））产生三维（3-D）Zn〜（ II）具有1,2-双（4-吡啶基）乙烷柱的骨架，而戊二酸酯给出二维（2-D）Zn〜（II）化合物（4）。结构2和5是4倍互穿网络，结构3和6是5倍互穿网络。 5型和6型在196 K时均显示出良好的CO_2吸附能力，这由S型吸附等温线证明。两种化合物在低温下也都表现出对N_2的选择性CO_2吸附，而含有己二酸酯配体的5种化合物在273和298 K处的CO_2吸收率高于具有更硬质粘液配体的6种。 5和6的CO_2吸附等构热分别为23.1 kJ mol〜（-1）和30.7 kJ mol〜（-1）。光致发光研究表明，相对于游离酸和配体，2、4和5的发射呈蓝移，而3具有基于配体的发光特性。还检查了这些配合物的热稳定性。

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