Related Experiment Video
Updated: Jul 16, 2025
10:42
Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
6.3K
Deinterpenetration of IRMOF-9.
Audrey B Crom1, Joseph L Strozier2, Caleb J Tatebe2
1Department of Chemistry, University at Albany, State University of New York, Albany, NY 12222, USA.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 15, 2023
Summary
Researchers developed a method to create larger pores in metal-organic frameworks (MOFs) by removing interpenetrating networks. This process yields non-interpenetrated MOFs with enhanced adsorption and separation capabilities.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) are known for their guest-accessible pores, crucial for adsorption and separation.
- Increasing MOF pore size enhances performance but often leads to interpenetration, reducing free volume.
- Controlling interpenetration is vital for synthesizing MOFs with desired properties.
Purpose of the Study:
- To develop a synthetic strategy for obtaining deinterpenetrated MOFs.
- To convert interpenetrated IRMOF-9 into its non-interpenetrated analogue.
- To demonstrate the effectiveness of halide-mediated etching for MOF structural control.
Main Methods:
- Solvothermal synthesis of IRMOF-9.
- Halide-mediated deinterpenetrative conversion using ethylammonium bromide.
- Characterization using dye adsorption, surface area analysis, pore size distribution, and powder X-ray diffraction.
Main Results:
- Successful synthesis of deinterpenetrated IRMOF-9 (IRMOF-10) via selective etching.
- Demonstrated quasi-selective etching of IRMOF-9 by ethylammonium bromide.
- Characterization confirmed the removal of interpenetration and isolation of the non-interpenetrated analogue.
Conclusions:
- Halide-mediated conversion is an effective method for deinterpenetrating MOFs.
- The resulting deinterpenetrated MOFs exhibit improved characteristics due to increased pore accessibility.
- This approach offers a pathway to engineer MOF structures for advanced applications.
Related Concept Videos
01:03IR Frequency Region: Fingerprint Region
936
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
936
01:25IR Spectrometers
1.2K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.2K
01:21IR Absorption Frequency: Hybridization
711
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
711
01:09Infrared (IR) Spectroscopy: Overview
1.9K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
1.9K
01:04IR Absorption Frequency: Delocalization
834
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
In IR...
834
01:20IR Spectrum Peak Intensity: Dipole Moment
735
The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
735