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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 structure by adding the...
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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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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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.
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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UV–Vis Spectrometers01:14

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A Visual Understanding of Circular Dichroism Spectroscopy.

Braden M Weight1, Victor M Freixas2, Aaron Forde1

  • 1Theoretical Division, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.

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|March 13, 2026
PubMed
Summary
This summary is machine-generated.

Researchers visualized electronic chiroptical response by decomposing rotary strength. This reveals competition in local chirality and connections to magnetic spin systems, aiding molecular design for quantum information science.

Keywords:
chiral center (Ch)chiral induced spin-selectivity (CISS)n-polyene(chlorofluoromethyl)benzenequantum information science (QIS)three-dimensional (3D)

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Area of Science:

  • Molecular spectroscopy
  • Quantum chemistry
  • Materials science

Background:

  • Mapping chemical structure to electronic/magnetic properties is vital for quantum information science.
  • Chiral molecules offer chiroptical responses, crucial for optical processing, sensing, and spintronics.
  • Predicting molecular anisotropy for circularly polarized light is complex due to coupled electric/magnetic responses.

Purpose of the Study:

  • To develop a visual representation of electronic chiroptical response.
  • To understand the constituents of rotary strength using an electronic oscillator framework.
  • To analyze chirality in model chemical systems and its relation to optical properties.

Main Methods:

  • Decomposition of rotary strength into constituent components.
  • Application of the electronic oscillator framework for classical intuition.
  • Analysis of three model chemical systems with local and global chirality.

Main Results:

  • Local chirality shows competition between chiral centers and induced chirality, leading to nonmonotonic trends and sign flips.
  • The transition chiral tensor visually distinguishes local from global chirality.
  • Chiroptically inactive transitions resemble antiferromagnetic spin systems, while active transitions show ferromagnetic-like alignment.

Conclusions:

  • The visual decomposition provides new insights into molecular chiroptical response.
  • Understanding these electronic interactions aids in designing molecules with desired optical properties.
  • Connections to spin systems offer a new perspective on chiroptical phenomena.