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Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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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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...

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Updated: Oct 17, 2025

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

Visible Light-Induced Transition Metal Catalysis.

Kelvin Pak Shing Cheung¹, Sumon Sarkar¹, Vladimir Gevorgyan¹

¹Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States.

Chemical Reviews

|October 8, 2021

Summary

This summary is machine-generated.

Visible light transition metal catalysis offers a novel approach to organic photocatalysis. This method uses a single transition metal complex for both light harvesting and catalysis, improving reactions and enabling new transformations.

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Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination

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Published on: August 18, 2020

Area of Science:

Organic chemistry
Photocatalysis
Transition metal catalysis

Background:

Visible light photocatalysis is a rapidly advancing field in organic chemistry.
Transition metal complexes are increasingly used as photocatalysts.
Conventional photoredox chemistry often employs dual photocatalysis with exogenous photosensitizers.

Purpose of the Study:

To review the early development and recent advances in visible light-induced transition metal catalysis.
To highlight the unique advantages of this approach compared to conventional methods.

Main Methods:

Review of existing literature on visible light-induced transition metal catalysis.
Analysis of the mechanisms and applications of this catalytic system.

Main Results:

Visible light transition metal catalysis enables unprecedented organic transformations.
This approach improves known organic reactions through synergistic catalyst-substrate interactions and photoinduced processes.
A single transition metal complex performs both light harvesting and catalytic functions, simplifying the catalytic cycle.

Conclusions:

Visible light-induced transition metal catalysis represents a significant paradigm shift in organic photocatalysis.
This field holds great promise for the development of novel synthetic methodologies.