Methyl‐Substituted α‐Cyclodextrin as Affinity Material for Storage, Separation, and Detection of Trichlorofluoromethane

Abstract

The severely ozone‐depleting trichlorofluoromethane is still appearing in several recycling processes or industrial applications. A simple and selective supramolecular complex formation of per ‐methylated α‐cyclodextrin ( 1 ) with the highly volatile trichlorofluoromethane ( 2 ) is reported. This interaction moreover leads to thermally stable crystals. Per ‐methylated α‐cyclodextrin is successfully exploited as a reversible and selective adsorption material for liquid and airborne trichlorofluoromethane as well as an affinity material for the chemical sensing and detection of this particular volatile organic component.

Optical Sensor for Real-Time Detection of Trichlorofluoromethane

“…Furthermore, it is noticeable that a slower complex formation yields a higher sensitivity of the sensor. These features indicate a more stable inclusion complex of the per -methyl substituted cyclodextrin derivatives with CFC-11 as compared to the other investigated cyclodextrin affinity materials and are in excellent agreement with our previous findings on the ICF of CFC-11 with hexakis(2,3,6-tri- O -methyl)-α-cyclodextrin (CyD1) [45], where even a spontaneous crystallization of the inclusion complex at higher concentrations could be observed.…”

“…The respective short hand formula of the applied cyclodextrin derivatives is depicted in Figure 3. The cyclodextrin derivatives CyD1-CyD6 were synthesized according to reaction conditions described in [44,45], whereas CyD7-CyD9 were synthesized following routes described in [46,47]. Structure and purity of each synthesized cyclodextrin derivative is confirmed by NMR-spectroscopy (AVANCE II 400 by Bruker Corporation, Billerica, MA, USA) and mass spectrometry (6545 Q-ToF by Agilent Technologies, Santa Clara, CA, USA).…”

Experimental and Computational Studies of Phenylene-Bridged Azaacenes as Affinity Materials for Sensing Using Quartz Crystal Microbalances

“…Selective and sensitive gas sensors and the increasing need to detect gas traces of hazardous, explosive, illicit and polluting chemicals are important challanges. 1,2 In particular, the abuse of compounds like amphetamines, γ-hydroxybutyric acid (GHB) and their precursors phenylacetone, safrole, and γ-butyrolactone (GBL) have caused significant societal problems. 3,4 Furthermore, BTX analytes (benzene, toluene and xylenes), used for example as rodenticides in overseas shipping containers, are hazardous for dockworkers if not detected beforehand.…”

“…9 Numerous affinity materials were investigated and showed quite unique behaviors. 2,4,12,15 A case with excellent selectivity, especially towards safrole, was reported for a microporous triptycene based azaacene. 12 The combination of a rigid triptycene core providing high porosity and an azaacene moiety seemed to be crucial for this kind of selectivity.…”

Sistem Pengaturan Pendingin Ruangan dengan Menggunakan Thermoelectric dan Blower Motor Direct Current

“…AC yang umumnya digunakan oleh masyarakat saat ini memakai Freon. Freon memiliki keunggulan berupa kondisi stabil dan titik beku yang rendah (L. Ma, L. Shang, D. Zhong, 2017) namun dapat merusak lapisan ozon(D. Ryvlin, M. Girschikofsky, D. Schollmeyer, R. Hellmann, 2018). Penelitian oleh Akbar Sujiwa dkk (Sujiwa & Nurochman, 2019) tentang penggunaan waterblock menyimpulkan bahwa penggunaan waterblock dapat menambah performansi pendingin termoelektrik.…”