Researchers have identified a key process that enables the Ebola virus to infect host cells, providing a novel target for developing antiviral drugs. The deadly Ebola virus incorporates a cellular enzyme into its virus particles, facilitating the infection to the target cells, according to ... more
New type of sensor material developed
Hokkaido University scientists have succeeded in developing a nickel complex that changes color and magnetism when exposed to methanol vapor. The new material can potentially be used not only as a chemical sensor, but also with future rewritable memory devices.
The phenomenon of color changes in a substance, triggered by volatile organic compound vapors or inorganic gas, is called vapochromism. Since its discovery at the end of the last century, scientists have focused their research on developing sensory materials that can visibly show the presence of harmful organic solvents. Furthermore, research on materials that synchronize color and other property changes, such as magnetism, could lead to broader applications.
The research team led by Masako Kato at Hokkaido University focused on developing materials that simultaneously change color and magnetism when exposed to vapors. To date, some iron complexes were known to switch magnetism between "paramagnetism" and "diamagnetism" at room temperature, but usually fall into stable states when temperatures are lower.
It was therefore important to develop materials that can change magnetism under a wider temperature range. The team focused on a nickel(II)-quinonoid complex. "As the complex changes magnetism when its coordination structure changes, we hypothesized that if solvent vapors could bind to nickel ions directly, the complex would simultaneously change colors and magnetism," says Masako Kato.
According to their research, a nickel(II)-quinonoid complex was placed in a high density methanol vapor environment. Once methanol molecules bonded with the complex, the coordination structure was transformed followed by a change in color from deep purple to orange. When exposed to vapors such as ethanol and chloroform, methanol molecules detached from the complex, reversing its color to deep purple.
In collaboration with Noriaki Matsunaga at Hokkaido University, they found that the color changes occurred along with changes in magnetism. When methanol molecules were removed from the complex, it switched from paramagnetism to diamagnetism, and both states could be maintained under a wide temperature range.
"This research marks the first time that vapor molecules have successfully changed magnetic states of nickel complexes," says Kato. "As the nickel complex reacts differentially to ethanol and methanol, it could be used in the future as a sensor material selective to methanol. We expect that further applications of this method may lead to novel materials that can record and erase data using vapor."
- Hokkaido University
- organic solvents
- nickel complexes
A gold compound shifts from a visible fluorescence to emitting infrared when ground - a big shift with potential applications in bioimaging and security inks. Some materials luminesce, changing their color and intensity when under mechanical forces such as grinding or rubbing. These lumines ... more
In plants, the pigment chlorophyll plays a central role in photosynthesis: the process of converting sunlight to energy. This process involves creating a flow of electrons by removing one from a molecule and transferring it to another. The first step happens when an electron is transferred ... more
- 1Detect neurodegenerative diseases such as Alzheimer's by a simple eye scan?
- 2Fluorescence microscopy at highest spatial and temporal resolution
- 3The Mechanics of the Immune System
- 4Resolve Biosciences Launches New Era in Single-Cell Spatial Analysis
- 5Quick look under the skin
- 6New ion trap to create the world's most accurate mass spectrometer
- 7How does your computer smell?
- 8Clocking electron movements inside an atom
- 9Sartorius closes 2020 with strong growth
- 10A clear path to better insights into biomolecules