Abstract
Gas-sensing materials are becoming increasingly important in our society, requiring high sensitivity to differentiate similar gases like N2 and O2. For the design of such materials, the driving force of electronic host-guest interaction or host-framework changes during the sorption process has commonly been considered necessary; however, this work demonstrates the use of the magnetic characteristics intrinsic to the guest molecules for distinguishing between diamagnetic N2 and CO2 gases from paramagnetic O2 gas. While the uptake of N2 and CO2 leads to an increase in TC through ferrimagnetic behavior, the uptake of O2 results in an O2 pressure-dependent continuous phase change from a ferrimagnet to an antiferromagnet, eventually leading to a novel ferrimagnet with aligned O2 spins following application of a magnetic field. This chameleonic material, the first with switchable magnetism that can discriminate between similarly sized N2 and O2 gases, provides wide scope for new gas-responsive porous magnets.
Highlights
Gas-sensing materials are becoming increasingly important in our society, requiring high sensitivity to differentiate similar gases like N2 and O2
A magnetic change can be beneficial for providing a responsive signal in such a sensing device, and would be advantageous for gas detection owing to contactless operation and detection independent of the sample shape of the host framework
Compound 1-solv crystallized in the triclinic space group P−1, where two different [Ru2] units and one TCNQ
Summary
Gas-sensing materials are becoming increasingly important in our society, requiring high sensitivity to differentiate similar gases like N2 and O2. While the uptake of N2 and CO2 leads to an increase in TC through ferrimagnetic behavior, the uptake of O2 results in an O2 pressure-dependent continuous phase change from a ferrimagnet to an antiferromagnet, eventually leading to a novel ferrimagnet with aligned O2 spins following application of a magnetic field This chameleonic material, the first with switchable magnetism that can discriminate between sized N2 and O2 gases, provides wide scope for new gas-responsive porous magnets. The control of spin coupling on oxygen molecules inserted into molecular porous frameworks[22,23,24,25,26,27] or graphite[28,29], as well as in bulk materials[30,31,32,33], has been seen as an important topic This is the first case in which a paramagnetic phase resulting from condensed oxygen molecules plays a key role for long-range ordering in an O2-accommodated magnet
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