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Related Concept Videos

Colors and Magnetism03:02

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 eye.

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Highly Transparent Photochromic Coating with Excellent Dimming Capability Based on B─O─W Coordination Bonding

Yuting Tian1, Xiaoying Xin1, Ju Hu1

  • 1School of Chemistry and Chemical Engineering, Southeast University, Jiangning, Nanjing, Jiangsu, 211189, China.

Angewandte Chemie (International Ed. in English)
|August 25, 2025
PubMed
Summary

Researchers developed advanced photochromic smart windows using a novel organic-inorganic hybrid material. These windows offer superior sunlight control and energy efficiency for buildings.

Keywords:
B─O─W coordinationDynamic orbital couplingPhotochromismSmart windows

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Building Technology

Background:

  • Photochromic smart windows are crucial for building energy efficiency, enabling solar heat and sunlight modulation.
  • Developing organic-inorganic hybrid coatings with high transparency and dimming capabilities presents significant challenges.

Purpose of the Study:

  • To design and synthesize a novel conjugated organic-inorganic hybrid photochromic material.
  • To achieve high transparency and excellent dimming performance for smart window applications.

Main Methods:

  • Utilized a B─O─W coordination bond locking strategy for high nanoparticle dispersion in a polymer network.
  • Modified the local coordination and electronic environment of tungsten (W) in Phosphotungstic acid (PTA) to reduce its energy band gap.

Main Results:

  • Achieved a novel conjugated organic-inorganic hybrid photochromic material with 96.4% transparency.
  • Demonstrated rapid photoresponse (coloring in 10 seconds) and excellent dimming ability (modulation range up to 94.0%).
  • The material reached saturation in 20 minutes, showing significant visible light modulation.

Conclusions:

  • The developed material shows great potential for enhancing indoor sunlight comfort.
  • This innovation offers a promising solution for increasing energy efficiency in buildings through selective heating and cooling.