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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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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...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

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The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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ZIF-8 Vibrational Spectra: Peak Assignments and Defect Signals.

Mueed Ahmad1,2, Roshan Patel3,4, Dennis T Lee1,5

  • 1Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-0701, United States.

ACS Applied Materials & Interfaces
|May 16, 2024
PubMed
Summary

This study clarifies vibrational spectra of Zeolitic imidazolate framework-8 (ZIF-8) using IR spectroscopy and simulations. It resolves conflicting interpretations of ZIF-8 defects for improved material design and quality control.

Keywords:
IR spectraMOFsZIFsdefects in ZIFspeak assignmentsvibrational spectroscopy

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Computational Chemistry

Background:

  • Zeolitic imidazolate framework-8 (ZIF-8) is crucial for gas separation, sensors, catalysis, and lithography.
  • ZIF-8 synthesis methods influence its structure, potentially introducing defects affecting performance.
  • Infrared (IR) spectroscopy is used to detect ZIF-8 defects, but interpretations vary.

Purpose of the Study:

  • To systematically investigate ZIF-8 vibrational spectra.
  • To assign spectroscopic peaks and identify defect signals.
  • To resolve conflicting literature interpretations and understand defect-induced spectral variations.

Main Methods:

  • Experimental Infrared (IR) spectroscopy.
  • First-principles molecular dynamics simulations.
  • Combined spectroscopic and computational analysis.

Main Results:

  • Detailed assignment of ZIF-8 vibrational spectra.
  • Identification of spectroscopic signatures for common ZIF-8 defects (e.g., missing ligands, trapped molecules).
  • Resolution of ambiguities in previous IR spectral interpretations of ZIF-8.

Conclusions:

  • Provides a comprehensive understanding of ZIF-8 vibrational spectra and defect signals.
  • Enables more accurate quality control and rational design of ZIF-8 materials.
  • Facilitates the development of advanced ZIF-8 based applications.