Bringing out the color in zinc

Researchers from the Institute of Industrial Science, The University of Tokyo, synthesize a two-center zinc complex that absorbs visible light as a solid and in solution
Credit: Institute of Industrial Science, the University of Tokyo

Zinc is an important element that is found widely in biological systems, is cheap to manufacture relative to other metals, and has low toxicity.

However, unlike other similar metals that exhibit a variety of vibrant colors in metal complexes, seeing different colors for zinc materials was not thought possible.

In a study published recently in Angewandte Chemie International Edition, researchers from the Institute of Industrial Science, The University of Tokyo, have synthesized a complex with two zinc ions that does exhibit color—greatly expanding the potential properties of zinc complexes.

Dramatic color changes are often used to demonstrate chemical reactions for fun; however, they can also have important uses in indicators, sensing, and smart materials. For certain metal complexes these changes happen because visible light has just the right energy to move electrons between the orbitals—the parts of the atom structure that accommodate the electrons. However, the energy gap between such orbitals of zinc’s most stable ion is much larger than the energy of visible light, so the electrons can’t be moved between the orbitals—and therefore can’t produce color.

Researchers from the Institute of Industrial Science, The University of Tokyo, have now shown that bringing a second zinc atom into play can result in a material that is yellow, both as a solid and when dissolved into solution.

The researchers carefully designed two molecules containing silicon atoms that provided perfect docking stations for the zinc ions to slot into. Both zinc–silyl complexes supported two zinc atoms but at different distances apart.

“We used two systems to show that the zinc atoms work together to create a complex that absorbs light in the visible spectrum,” explains lead author of the study Yoshimasa Wada. “In the first system the zinc atoms were relatively far apart—5.71 angstroms—and the material was colorless. While in the second system, they were much closer together—2.93 angstroms—and the zinc material was yellow.”

In the system where the zinc atoms were closer together, they were able to combine their orbitals so that the energy needed for their electrons to rearrange was in the visible region. On a large scale this meant that both the solid and solution of the second complex appeared yellow.

“The observed interaction between the zinc centers broadens the potential properties of zinc complexes,” says Yusuke Sunada, senior author. “We believe our findings will open up a whole new family of interesting materials.”

Zinc can now add visible light interaction to its list of useful properties. Given the prevalence of zinc in biology and its low toxicity, this could open up new uses for zinc in biosensing and biocatalysis.

The article, “Visible Light Responsive Dinuclear Zinc Complex Consisting of Proximally Arranged Two d10-Zinc Centers”, was published in Angewandte Chemie International Edition at DOI: 10.1002/anie.202310571

 

About Institute of Industrial Sciene, The University of Tokyo

The Institute of Industrial Science, The University of Tokyo (UTokyo-IIS) is one of the largest university-attached research institutes in Japan. UTokyo-IIS is comprised of over 120 research laboratories—each headed by a faculty member—and has over 1,200 members (approximately 400 staff and 800 students) actively engaged in education and research. Its activities cover almost all areas of engineering. Since its foundation in 1949, UTokyo-IIS has worked to bridge the huge gaps that exist between academic disciplines and real-world applications.

Journal: Angewandte Chemie International Edition
DOI: 10.1002/anie.202310571
Article Title: Visible Light Responsive Dinuclear Zinc Complex Consisting of Proximally Arranged Two d10-Zinc Centers
Article Publication Date: 10-Oct-2023

Media Contact

Yusuke Sunada
Institute of Industrial Science, The University of Tokyo
sunada@iis.u-tokyo.ac.jp
Office: 81-354-526-361

Media Contact

Yusuke Sunada
Institute of Industrial Science, The University of Tokyo

All latest news from the category: Life Sciences and Chemistry

Articles and reports from the Life Sciences and chemistry area deal with applied and basic research into modern biology, chemistry and human medicine.

Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.

Back to home

Comments (0)

Write a comment

Newest articles

Spinning sustainable and functional fiber materials

The German Institutes of Textile and Fiber Research Denkendorf (DITF) have modernized and significantly expanded their melt spinning pilot plant with support from the State of Baden-Württemberg. The new facility…

Network of quantum sensors boosts precision

Quantum sensor technology promises even more precise measurements of physical quantities. A team led by Christian Roos at the University of Innsbruck has now compared the signals of up to…

Astronomers reveal a new link between water and planet formation

Researchers have found water vapour in the disc around a young star exactly where planets may be forming. Water is a key ingredient for life on Earth, and is also…

Partners & Sponsors