A new Zn-based metal–organic framework with 8-connected hex topology constructed from bipyridine and carboxylate ligands, namely [Zn(cpna)₃(tmbpy)]_n·4DMF (1) (H₂cpna = 6-(4-carboxyphenyl)nicotinic acid; tmbpy = 3,3′-dimethyl-4,4′-bipyridine), has been synthesized under solvothermal conditions. The Zn-MOF was structurally characterized and retained a good crystal structure after activation (1a), an indication of permanent porosity. 1a exhibits a BET surface of 770 m² g⁻¹ and the maximum aperture of 8.60 Å. Single component adsorption isotherm measurements of C₂H₂, CO₂, CH₄, CO and N₂ on 1a were performed both at 273 K and 298 K, and the selectivities for C₂H₂/CH₄, C₂H₂/CO₂, CO₂/CO, CO₂/CH₄ and CO₂/N₂ were estimated on the basis of the ideal adsorbed solution theory (IAST). 1a shows the uptake of C₂H₂ (3.89 mmol g⁻¹) and CO₂ (3.52 mmol g⁻¹) at 273 K and 100 kPa, respectively. Due to the Lewis basic pyridyl sites inside the channel of the framework, 1a showed good adsorption selectivities for C₂H₂/CH₄(50 : 50) and C₂H₂/CO₂(50 : 50) at 298 K (100 kPa).

中文翻译：

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具有路易斯碱性吡啶基位点的微孔锌-有机骨架，用于高度选择性的C2H2 / CH4和C2H2 / CO2气体分离

一种新的基于锌的金属有机骨架，具有由联吡啶和羧酸酯配体构成的八连接六边形拓扑结构，即[Zn（cpna）₃（tmbpy）] _n ·4DMF（1）（H ₂ cpna = 6-（4-羧基苯基）烟酸； tmbpy = 3,3'-二甲基-4,4'-联吡啶），是在溶剂热条件下合成的。Zn-MOF的结构特征在于，活化后保持了良好的晶体结构（1a），这表明存在永久孔隙。图1a的BET表面为770m ² g ^-1，最大孔径为8.60。C ₂ H _2的单组分吸附等温线测量，分别在273 K和298 K上进行1a上的CO ₂，CH ₄，CO和N ₂，并且对C ₂ H ₂ / CH ₄，C ₂ H ₂ / CO ₂，CO ₂ / CO，CO ₂的选择性根据理想吸附溶液理论（IAST）估算/ CH ₄和CO ₂ / N ₂。图1a显示了对C ₂ H ₂（3.89 mmol g ^-1）和CO ₂（3.52 mmol g ^-1）的吸收）分别为273 K和100 kPa。由于骨架通道内的Lewis碱性吡啶基位点，在298 K（100）下，1a对C ₂ H ₂ / CH ₄（50:50）和C ₂ H ₂ / CO ₂（50:50）表现出良好的吸附选择性。kPa）。