121st General Meeting of the KCS

Type Poster Presentation
Area Inorganic Chemistry
Room No. Event Hall
Time 4월 19일 (목요일) 11:00~12:30
Code INOR.P-194
Subject A Chemical Function of Commonly Inert Trichloromethane: Room-Temperature Removal of Coordinated Solvents at Open Metal Sites in MOFs
Authors Jinhee Bae, Nak Cheon Jeong*
Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology, Korea
Abstract Open coordination sites (OCSs) in metal-organic frameworks (MOFs) have shown potential in applications such as molecular separation and sorption, catalysis, ionic and electronic conductions, and chemical sensing, among others. Thus, the removal of coordinated solvents at OCSs has been thought as an important prerequisite step that must be performed prior to use of MOFs in such applications. Thermal activation (TA) method that is normally performed by applying high temperature and vacuum has been commonly employed to remove the coordinated solvents from the MOFs. However, considering that the TA influences negatively on the structural integrity of MOF, a safe method for the activation has been demanded. In this poster presentation, we introduce a new and safe activation method, that is, ‘chemical activation’ that is performed by trichloromethane (TCM). More concretely, soaking MOFs into fresh TCM solvent several times can completely remove the coordinated solvent from the MOFs and thereby, fully activate the MOFs. We ascribe the activation function behaviour of TCM to its possible coordination to metal center. We observed that although TCM is an inert chemical so that employed as a solvent in the variety of chemical reactions, the lone-paired electrons at the Cl atoms in TCM could coordinate to the OCSs at Cu centers. In particular, we will discuss a possible coordination of TCM and a plausible mechanism for the chemical activation function of TCM treatment process on the basis of the results obtained from Raman spectroscopic analysis. Finally, we also demonstrate that this chemical activation method is a superior strategy for activating thermally deformable MOF-polymer mixed matrices (MMs).
E-mail bjh1332@dgist.ac.kr