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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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 Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

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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...
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IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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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...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Intermolecular Vibration Energy Transfer Process in Two CL-20-Based Cocrystals Theoretically Revealed by

Hai-Chao Ren1, Lin-Xiang Ji2, Tu-Nan Chen3

  • 1Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.

Molecules (Basel, Switzerland)
|April 12, 2022
PubMed
Summary
This summary is machine-generated.

This study explores energy transfer and interactions in explosive cocrystals like TNT/CL-20 and HMX/CL-20. Stronger intermolecular interactions were found to correlate with lower impact sensitivity in these energetic materials.

Keywords:
Mayer bond order densitycocrystal HMX/CL-20cocrystal TNT/CL-20impact sensitivitynon-covalent interactiontwo-dimensional infrared spectravibration energy transfer

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Area of Science:

  • Energetic Materials Science
  • Computational Chemistry
  • Materials Physics

Background:

  • Cocrystallization is a key strategy for tuning the properties of energetic materials.
  • Understanding intermolecular interactions and energy transfer is crucial for designing safer and more effective explosives.

Purpose of the Study:

  • To theoretically investigate vibrational energy transfer and non-covalent interactions in TNT/CL-20 and HMX/CL-20 cocrystals.
  • To establish a theoretical framework for predicting the stability and sensitivity of energetic materials based on intermolecular forces.

Main Methods:

  • Calculated two-dimensional infrared (2D IR) spectra to analyze vibrational energy transfer.
  • Independent Gradient Model based on Hirshfeld partition (IGMH) to visualize and quantify non-covalent interactions.
  • Mayer bond order density analysis to assess bond stabilization.

Main Results:

  • Theoretical models accurately reproduced experimental geometries of TNT/CL-20 and HMX/CL-20.
  • Vibrational energy transfer rates were quantified, showing slower transfer between CL-20 and TNTII/TNTIII compared to TNTI.
  • Non-covalent interactions, including van der Waals forces and hydrogen bonds, were identified and characterized, with HMX/CL-20 interactions being primarily van der Waals.
  • Intermolecular interactions were found to stabilize trigger bonds, correlating with reduced impact sensitivity.

Conclusions:

  • The study provides insights into the mechanisms governing cocrystal formation and stability in energetic materials.
  • The findings support the hypothesis that stronger intermolecular interactions lead to decreased impact sensitivity.
  • This research offers a foundation for the rational design of novel energetic materials with tailored safety and performance characteristics.