Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, Manauli PO, S.A.S. Nagar, Mohali, Punjab 140306, India.
ACS Appl Mater Interfaces. 2023 Feb 15;15(6):8241-8252. doi: 10.1021/acsami.2c22889. Epub 2023 Feb 4.
Multifunctional metal-organic frameworks (MOFs) rely on the properties of metal centers (nodes) and/or linkers (struts) for their diverse applications in the emerging field of research. Currently, there is a huge demand for MOF materials in the field of capture/fixation/sensing of air pollutants, harmful chemical effluents, and nuclear waste. However, it is a challenging task to utilize one MOF for providing remedies to all these issues. On the basis of our current research activities, we have identified that an oxadiazole moiety-a five-membered ring with two different heteroatoms (O and N)-in a carboxylate linker can be the key to generating such MOF materials for its (a) inherent polarizable nature and molecular docking ability and (b) photoluminescence properties. In this work, we report a 3D MOF {[Co(oxdz)(tpbn)(HO)]·4HO} (), self-assembled at room temperature from a three-component reaction, with an oxadiazole moiety (where Hoxdz = 4,4'-(1,3,4-oxadiazole-2,5-diyl)dibenzoic acid and tpbn = N,N',N,"N″'-tetrakis(2-pyridylmethyl)-1,4-diaminobutane). The inherent polarizable nature of the oxadiazole moiety in has been efficiently exploited for (i) multimedia iodine capture and (ii) fixation of CO under solvent-free and ambient conditions. On the other hand, the luminescent nature of the framework is found to be an efficient, highly preferred turn-on sensor for the ultra-fast detection of ketones with a limit as low as parts-per-trillion (mesitylene oxide: 447 ppt; cycloheptanone: 4.7 ppb; cyclohexanone: 17.2 ppb; acetylacetone: 18 ppb).
多功能金属-有机骨架（MOFs）依赖于金属中心（节点）和/或连接体（支柱）的性质，在新兴的研究领域中具有多种应用。目前，MOF 材料在空气污染物、有害化学废水和核废料的捕获/固定/传感领域有巨大的需求。然而，利用一种 MOF 来解决所有这些问题是一项具有挑战性的任务。基于我们目前的研究活动，我们已经确定，在羧酸连接体中，一个包含两个不同杂原子（O 和 N）的噁二唑部分可以成为生成这种 MOF 材料的关键，原因在于其（a）固有可极化性质和分子对接能力，以及（b）光致发光性质。在这项工作中，我们报告了一种 3D MOF {[Co(oxdz)(tpbn)(HO)]·4HO} ()，它是在室温下通过三组分反应自组装而成的，其中含有噁二唑部分（其中 Hoxdz = 4,4'-(1,3,4-噁二唑-2,5-二基)二苯甲酸和 tpbn = N,N',N,"N′′-四(2-吡啶甲基)-1,4-二氨基丁烷）。中噁二唑部分的固有可极化性质已被有效地利用于（i）多模式碘捕获，以及（ii）在无溶剂和环境条件下固定 CO。另一方面，发现该框架的发光性质是一种高效、高度优选的酮类物质的超快速检测开启型传感器，其检测限低至万亿分之几（mesitylene oxide：447 ppt；cycloheptanone：4.7 ppb；cyclohexanone：17.2 ppb；acetylacetone：18 ppb）。
