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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...
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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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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01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
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01:26Thermal and Photochemical Electrocyclic Reactions: Overview
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Metal Complexes Supported on Solid Matrices for Visible-Light-Driven Molecular Transformations.
Kohsuke Mori1,2,3, Hiromi Yamashita4,5
1Graduate School of Engineering, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan. mori@mat.eng.osaka-u.ac.jp.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 18, 2016
Summary
Hybrid photocatalysts combine metal complexes with solid matrices for efficient, selective chemical reactions. This review details architectures for visible-light catalysis, including oxidation and water splitting.
Area of Science:
- Materials Science
- Photocatalysis
- Nanotechnology
Background:
- Visible-light-responsive metal complexes offer potential for practical photocatalyst design.
- Hybrid materials can achieve synergistic effects, enabling unprecedented chemical reactions.
- Nanostructured photocatalysts are key for efficient and selective molecular transformations.
Purpose of the Study:
- To highlight precise architectures of hybrid photocatalysts for efficient and selective photochemical transformations.
- To discuss techniques for immobilizing metal complexes within solid matrices.
- To explore relationships between photoluminescence and photocatalytic activity in these hybrid materials.
Main Methods:
- Review of various immobilization techniques for metal complexes.
- Encapsulation within zeolite cavities.
- Anchoring within mesoporous channels, ion-exchange resins, layered materials, and onto silver nanoparticles.
Main Results:
- Hybrid photocatalysts enable efficient and selective oxidation by O2.
- Hybrid photocatalysts facilitate H2 evolution from water.
- Specific architectures correlate with enhanced photoluminescence and photocatalytic activity.
Conclusions:
- Hybridization of metal complexes with solid matrices is a viable strategy for designing advanced photocatalysts.
- Precise control over hybrid architectures is crucial for optimizing photocatalytic performance.
- These nanostructured photocatalysts offer operational simplicity and high selectivity for molecular transformations.