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Regulation on C2H2/CO2 adsorption and separation by molecular rotors in metal–organic frameworks
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-05-31 , DOI: 10.1039/d4ta03374d
Li-Qiu Yang 1 , Jia Yu 1 , Shu-Cong Fan 1 , Ying Wang 1 , Wen-Yu Yuan 1 , Quan-Guo Zhai 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-05-31 , DOI: 10.1039/d4ta03374d
Li-Qiu Yang 1 , Jia Yu 1 , Shu-Cong Fan 1 , Ying Wang 1 , Wen-Yu Yuan 1 , Quan-Guo Zhai 1
Affiliation
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The introduction of molecular rotors with distinct kinetic characteristics into metal–organic frameworks (MOFs) imparts these materials with heightened responsiveness, facilitating precise control over gas molecule recognition, adsorption as well as separation. This enhancement translates into improved performance in separating light hydrocarbons. In this investigation, three MOF materials (In-NDC, SNNU-118, and SNNU-128) were synthesized with two molecular rotor-containing ligands, 1,4-naphthalenedicarboxylic acid (1,4-NDC) and 9,10-anthracenedicarboxylic acid (9,10-ADC). Among these materials, In-NDC and SNNU-118 exist as supramolecular isomers. Through meticulous adjustment of synthesis conditions, successful structural transformations were achieved. Unlike In-NDC, the rotational flexibility of the molecular rotor 1,4-NDC endows SNNU-118 with distinctive adsorption behavior, manifesting as a gate-opening effect induced by the rotation of the molecular rotor. This phenomenon is facilitated by electrostatic repulsion between 1,4-NDC and CO2 during the adsorption process. Additionally, the electrostatic attraction between the framework and C2H2 molecules significantly enhances C2H2 adsorption at low pressure, thereby improving selectivity for C2H2. Compared to In-NDC, the IAST selectivity values increased from 4.55 to 17.05. Dynamic breakthrough experiments demonstrate the effective separation capabilities of both In-NDC and SNNU-118 in separating C2H2/CO2 mixed gases.
中文翻译：
金属有机骨架分子转子对C2H2/CO2吸附分离的调控
将具有独特动力学特性的分子转子引入金属有机框架（MOF）中，赋予这些材料更高的响应能力，促进对气体分子识别、吸附和分离的精确控制。这种增强转化为分离轻质烃的性能提高。在这项研究中，三种MOF材料（In-NDC、SNNU-118和SNNU-128）是用两种含分子转子的配体1,4-萘二甲酸（1,4-NDC）和9,10-蒽二甲酸合成的。酸（9,10-ADC）。在这些材料中，In-NDC和SNNU-118以超分子异构体存在。通过对合成条件的精心调整，成功实现了结构转变。与In-NDC不同，分子转子1,4-NDC的旋转灵活性赋予SNNU-118独特的吸附行为，表现为分子转子旋转引起的开门效应。吸附过程中 1,4-NDC 和 CO 2 之间的静电排斥促进了这种现象。此外，框架与C 2 H 2 分子之间的静电引力显着增强了C 2 H 2 在低压下的吸附，从而提高 C 2 H 2 的选择性。与In-NDC相比，IAST选择性值从4.55增加到17.05。动态突破性实验证明了In-NDC和SNNU-118在分离C 2 H 2 /CO 2 混合气体方面具有有效的分离能力。
更新日期：2024-05-31
中文翻译：
金属有机骨架分子转子对C2H2/CO2吸附分离的调控
将具有独特动力学特性的分子转子引入金属有机框架（MOF）中，赋予这些材料更高的响应能力，促进对气体分子识别、吸附和分离的精确控制。这种增强转化为分离轻质烃的性能提高。在这项研究中，三种MOF材料（In-NDC、SNNU-118和SNNU-128）是用两种含分子转子的配体1,4-萘二甲酸（1,4-NDC）和9,10-蒽二甲酸合成的。酸（9,10-ADC）。在这些材料中，In-NDC和SNNU-118以超分子异构体存在。通过对合成条件的精心调整，成功实现了结构转变。与In-NDC不同，分子转子1,4-NDC的旋转灵活性赋予SNNU-118独特的吸附行为，表现为分子转子旋转引起的开门效应。吸附过程中 1,4-NDC 和 CO 2 之间的静电排斥促进了这种现象。此外，框架与C 2 H 2 分子之间的静电引力显着增强了C 2 H 2 在低压下的吸附，从而提高 C 2 H 2 的选择性。与In-NDC相比，IAST选择性值从4.55增加到17.05。动态突破性实验证明了In-NDC和SNNU-118在分离C 2 H 2 /CO 2 混合气体方面具有有效的分离能力。
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