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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...

Structural Isomerism

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...

Coordination Compounds and Nomenclature

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

Coordination Number and Geometry

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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...

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Related Experiment Video

Updated: Jul 28, 2025

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

Novel ternary Cu

Lin Niu¹, Xiaoli Zhao², Zhi Tang²

¹School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.

The Science of the Total Environment

|June 3, 2023

Summary

This summary is machine-generated.

A novel Fe0/C@Cu0 catalyst effectively degrades sulfathiazole (STZ) in wastewater. This stable, reusable catalyst offers a promising new method for treating chemical waste through synergistic micro-electrolysis.

Keywords:

Advanced oxidation process Bimetallic catalyst DFT Micro-electrolysis

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Area of Science:

Environmental Chemistry
Materials Science
Catalysis

Background:

Sulfathiazole (STZ) is a persistent pollutant in water bodies.
Conventional wastewater treatment methods struggle to efficiently remove STZ.
Development of advanced oxidation processes is crucial for environmental remediation.

Purpose of the Study:

To synthesize and characterize a novel ternary micro-electrolysis system (Fe0/C@Cu0) for sulfathiazole degradation.
To investigate the catalytic activity, stability, and reusability of the Fe0/C@Cu0 catalyst.
To elucidate the degradation mechanism of STZ using the developed catalyst.

Main Methods:

Synthesis of carbon-coated metallic iron with copper nanoparticles (Fe0/C@Cu0).
Characterization of catalyst structure and properties, focusing on Fe-Cu interaction and core-shell morphology.
Evaluation of catalytic performance for sulfathiazole degradation in aqueous solutions and landfill leachate.
Analysis of degradation mechanism via synergistic effects of Fe0, C, and Cu0.

Main Results:

The Fe0/C@Cu0 catalyst demonstrated excellent reusability and stability.
Catalysts prepared using iron citrate showed enhanced Fe-Cu contact and superior STZ degradation.
A unique core-shell structure promoted efficient STZ removal via a two-stage degradation process.
The catalyst performed effectively in degrading STZ within landfill leachate effluent.

Conclusions:

The Fe0/C@Cu0 ternary micro-electrolysis system is a highly effective catalyst for sulfathiazole degradation.
Synergistic effects between Fe0, C, and Cu0, facilitated by the core-shell structure, drive the degradation process.
This catalyst presents a novel and efficient strategy for treating chemical wastewater contaminated with sulfathiazole.