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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...

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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...

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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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Structural Isomerism

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Coordination Number and Geometry

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Related Experiment Video

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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

Published on: October 15, 2019

Coal-Tar Dye-based Coordination Cages and Helicates.

Irene Regeni¹, Bin Chen^1,2, Marina Frank¹

¹Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 6, 44227, Dortmund, Germany.

Angewandte Chemie (International Ed. in English)

|November 27, 2020

Summary

Researchers developed new self-assemblies using coal-tar dyes like methylene blue. These structures exhibit vibrant colors and show potential for advanced optical materials and chiral recognition applications.

Keywords:

chirality transfer coordination cages dyes self-assembly supramolecular chemistry

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Area of Science:

Supramolecular Chemistry
Coordination Chemistry
Materials Science

Background:

Coal-tar dyes possess unique optical properties.
Self-assembly is a powerful strategy for creating complex molecular architectures.
Incorporating functional dyes into supramolecular structures can lead to novel materials.

Purpose of the Study:

To introduce a strategy for incorporating four classic coal-tar dyes into palladium-based self-assemblies.
To investigate the structural diversity and chiroptical properties of these new assemblies.
To explore potential applications in chiroptical recognition and optical materials.

Main Methods:

Synthesis of bis-monodentate ligands functionalized with coal-tar dyes.
Palladium coordination to form [Pd2L4] self-assemblies (cages and helicates).
Structural characterization using single crystal X-ray diffraction.
Chiroptical property analysis via circular dichroism (CD) spectroscopy.
Binding mode investigation using ion mobility mass spectrometry.

Main Results:

Successful incorporation of Michler's ketone, methylene blue, rhodamine B, and crystal violet into palladium self-assemblies.
Formation of lantern-shaped dinuclear cages with pyridine donors and twisted [Pd2L4] helicates with quinoline donors.
Observation of a [Pd3L6] ring structure in the solid state for one derivative.
Demonstration of chiral induction by enantiomerically pure guests, evidenced by CD spectroscopy.
Distinction of two binding modes using ion mobility mass spectrometry.

Conclusions:

A versatile ligand platform enables the integration of coal-tar dyes into diverse palladium self-assemblies.
The resulting supramolecular structures exhibit tunable colors and chiroptical responses.
These self-assemblies hold promise for applications in chiroptical recognition, photo-redox catalysis, and advanced optical materials.