120th General Meeting of the KCS

Type Poster Presentation
Area Inorganic Chemistry
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code INOR.P-32
Subject A Chemical Function of Chemically Inert Trichloromethane: Low-Temperature Activation of Open Metal Sites in MOFs [우수포스터상]
Authors Jae Sun Choi, Nak Cheon Jeong1,*
Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology, Korea
1Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology, Korea
Abstract Open metal site (OMS), coordinatively unsaturated site on metal node in metal-organic frameworks (MOFs), has often shown considerable significance in its role for applications such as gas storage, molecular separation, and ionic and electronic conductions. Thus, the activation of MOFs, the removal of precoordinated solvent molecules (typically used in during the synthesis) at the OMSs, has been thought as an important prerequisite step that must be performed prior to use of the MOFs for the applications. So far, thermal activation that is performed by applying heat and vacuum (hereafter TA) has been considered as a unique method to remove the precoordinating solvent molecules. However, given that high temperature (e.g., >150 °C) has often led to structural damage or complete collapse of MOFs, a low-temperature process for safe activation has been demanded. In this poster, we present a new activation method, “chemical activation”, which is performed at room temperature. More precisely, the chemical activation process is achieved just by soaking MOF samples in trichloromethane (TCM) for several minutes. Using Raman spectroscopic analysis, we provide a plausible mechanism for the activation function of TCM. The efficiency of activation function of TCM is similar to that of TCM-analogous dichloromethane (DCM) at room temperature. However, the efficiency of TCM is substantially enhanced when it applies slightly higher temperature.
E-mail dkzm@dgist.ac.kr