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Related Concept Videos

UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

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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...
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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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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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Updated: Apr 27, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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[Porphyrins with different electron groups: spectral and DFT study].

Hai Wu, Su-Hua Fan, Hong Zhang

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
    |July 11, 2014
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    Introducing electron-donating methoxyl groups to porphyrin derivatives, like (p-OCH3)TPPOH, shifts UV-Vis spectra and alters electrochemical properties. This enhances understanding for designing new porphyrin materials.

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    Area of Science:

    • Materials Science
    • Computational Chemistry
    • Spectroscopy

    Context:

    • Porphyrin derivatives are crucial in various applications, necessitating a deep understanding of their structure-property relationships.
    • Investigating the impact of electron-donating groups on porphyrin electronic and optical properties is key for designing advanced materials.

    Purpose:

    • To experimentally and theoretically investigate the influence of para-methoxyl substitution on the UV-Vis absorption spectra and electrochemical properties of 5-(o-hydroxyphenyl)-10, 15, 20-tri-(p-phenyl)porphyrin (TPPOH).
    • To elucidate the electronic mechanisms behind observed spectral and electrochemical changes using density functional theory (DFT).

    Summary:

    • UV-Vis absorption spectra and electrochemical properties of TPPOH and its para-methoxyl derivative [(p-OCH3)TPPOH] were studied.
    • The introduction of the electron-donating para-methoxyl group resulted in a 3 nm red shift in UV-Vis spectra, a negative shift in redox potential, and a decrease in the highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy gap.
    • DFT calculations confirmed increased electron density in the porphyrin ring, leading to elevated HOMO and LUMO energy levels and a reduced energy gap.

    Impact:

    • Provides a mechanistic understanding of how electron-donating groups modify porphyrin properties.
    • Offers valuable insights for the rational design and application of tailored porphyrin derivatives in materials science and related fields.