The structure which consists in particular of hydrogen, fluorine, carbon and copper, has been realized in an entirely novel, three-dimensional and very stable form. This will be described in an upcoming issue of the journal "Chemical Communications".
Magnetism is a physical property of matter related to the magnetic spins of electrons. Iron, for example, is a ferromagnet because these spins are aligned parallel to each other, generating a uniform magnetic field. Antiferromagnetism, on the other hand, arises when neighboring spins are oriented antiparallel to each other.
Such antiferromagnetism has been shown to exist for the new polymeric compound studied at the Forschungszentrum Dresden-Rossendorf (FZD). This polymer is characterized by a novel and unusual structure where copper atoms together with pyrazin-molecules build layers, which in turn through bridges of hydrogen and fluorine are connected with each other. The three-dimensional polymer was prepared by chemists working with Jamie Manson at Eastern Washington University and was subsequently studied by physics teams in Great Britain and in the research center in Dresden-Rossendorf.
Metallic copper is not magnetic. Joachim Wosnitza and his colleagues at the Dresden High Magnetic Field Laboratory discovered at a temperature of 1.54 Kelvin – that is 1.54 degrees above absolute zero at -273.15 °C – that the embedded copper atoms order themselves antiferromagnetically. In the compound, every copper ion possesses a magnetic spin which interacts with neighboring spins through organic units. How this interaction arises and how it can be influenced is presently under investigation.
Additional polymeric samples from the laboratory of Manson will be studied at the Forschungszentrum Dresden-Rossendorf with the objective of a better understanding of the newly discovered magnetism for this class of polymers. In the future, this would be a significant step, to synthesize organic materials with tailored magnetic properties. Permanent magnets can be made from iron and other ferromagnetic materials, from polymers this is, according to the current knowledge, not possible. The great vision of the scientists is to realize ferromagnetic properties for novel polymeric compounds that eventually would permit the development of innovative magnets.
Christine Bohnet | alfa
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22.09.2017 | Forschungszentrum MATHEON ECMath
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
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