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Related Concept Videos

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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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
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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 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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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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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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¹H NMR Signal Multiplicity: Splitting Patterns01:13

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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Patterns in two-dimensional spectra can identify broken rovibrational selection rules.

Trinity G Smith1, Keeyoon Sung2, Peter C Chen1

  • 1Spelman College Department of Chemistry and Biochemistry, Atlanta, Georgia 30314, USA.

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|May 16, 2025
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Summary
This summary is machine-generated.

This study reveals unusual patterns in two-dimensional rovibrational spectra of methane-d3 (CH3D). These patterns, arising from forbidden transitions, aid in assigning complex molecular spectra.

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Area of Science:

  • Molecular spectroscopy
  • Quantum mechanics
  • Spectroscopic analysis

Background:

  • Symmetric top molecules exhibit allowed rovibrational transitions (ΔK = 0 or ±1).
  • Quantum number mixing can lead to forbidden transitions, especially in high-density spectral regions.
  • Assigning complex molecular spectra is challenging due to overlapping features.

Purpose of the Study:

  • To present a two-dimensional (2D) rovibrational spectrum of CH3D.
  • To identify and analyze unusual spectral patterns indicative of forbidden transitions.
  • To demonstrate the utility of 2D spectroscopy for spectral assignment.

Main Methods:

  • Acquisition of a 2D rovibrational spectrum for CH3D.
  • Analysis of spectral patterns related to changes in rotational quantum numbers J and K.
  • Distinguishing between parallel (ΔK = 0) and perpendicular (ΔK = ±1) band characteristics.

Main Results:

  • Observed distinguishable patterns in J and K quantum number changes within the 2D spectrum.
  • Identified an unusual pattern suggesting ΔK = ±1 transitions in the mid-infrared and ΔK = ±2 transitions in the near-infrared.
  • Demonstrated the potential for observing distinct multidimensional patterns.

Conclusions:

  • The observed spectral patterns provide insights into perturbed rovibrational transitions in CH3D.
  • 2D spectroscopy offers a powerful tool for resolving spectral congestion and assigning complex spectra.
  • This technique can be applied to other molecules with dense spectral regions.