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Colors and Magnetism

Colors and Magnetism

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...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

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...

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Properties of Organometallic Compounds

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.

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.

Halogens

Halogens

Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.

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Related Experiment Video

Updated: Oct 20, 2025

Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes

Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes

Published on: July 28, 2018

Transition-metal difluorocarbene complexes.

Wei Zhou¹, Wen-Jie Pan², Jie Chen²

¹School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.

Chemical Communications (Cambridge, England)

|September 16, 2021

Summary

This summary is machine-generated.

Transition-metal difluorocarbene complexes offer exciting synthetic potential but face challenges due to unpredictable reactivity. This review covers recent advances in difluorocarbene transfer and complex reactivity, aiding future catalytic designs.

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

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Last Updated: Oct 20, 2025

Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes

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Published on: July 28, 2018

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Published on: April 19, 2019

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

Area of Science:

Organometallic Chemistry
Fluorine Chemistry
Catalysis

Background:

Transition metal carbenes are widely used, and difluorocarbene is a key intermediate.
Utilizing transition-metal difluorocarbenes in synthesis is challenging due to their unpredictable reactivity.
Recent progress has been made in catalyzed or mediated transfer of difluorocarbene.

Purpose of the Study:

To review recent developments in transition-metal-catalyzed or -mediated transfer of difluorocarbene.
To discuss the reactivities and conversions of transition-metal difluorocarbene complexes.
To provide insights into M-CF2 bonding and its implications for catalysis.

Main Methods:

Review of recent literature on transition-metal difluorocarbene chemistry.
Analysis of M-CF2 bonding.
Discussion of difluorocarbene transfer progress.
Exploration of M-CF2 conversions into other metal complexes.

Main Results:

Recent advances in the catalytic transfer of difluorocarbene have been highlighted.
The bonding and reactivity of transition-metal difluorocarbene complexes are explored.
Progress in converting M-CF2 into other metal complexes is discussed.

Conclusions:

Understanding the reactivity of M-CF2 complexes is crucial for designing effective difluorocarbene transfer catalysts.
This review provides a foundation for future research in this area.
Further exploration of M-CF2 reactivity can unlock new synthetic applications.