|Porous ionic liquid||292||28.4%|
Largest aromatic ring
|Asymmetrical molecular knots||178||17.3%|
Boron quadruple bond
Threading rings on a polymer chain
|Beryllium radical cation||27||2.6%|
Molecule: Porous ionic liquid
Molecule: Largest aromatic ring
Molecule: Asymmetrical molecular knots
Molecule: 2-D metallo-supramolecule
Molecule: Boron quadruple bond
Molecule: Threading rings on a polymer chain
Molecule: Beryllium radical cation
University of Oxford researchers constructed a 16 nm wide molecular wheel, which contains 12 porphyrins and 162 π electrons. In the ring, zinc porphyrins are linked by alkynes and held in place by molecular spokes. The molecule is of interest for quantum computing (Nat. Chem. 2020, DOI: 10.1038/s41557-019-0398-3).
A multi-institution team made a 2-D metallo-supramolecule that measures nearly 20 nm across (Nat. Chem. 2020, DOI: 10.1038/s41557-020-0454-z). Ruthenium-complexing terpyridine ligands form hexagons that assemble into a larger grid by complexing iron(II). The team aims to use these and related supramolecules as single-molecule information storage devices.
This new porous ionic liquid has cavities that are approximately 6.2 Å wide—big enough to capture alcohols and chlorofluorocarbons (CFCs). Previous porous liquids couldn’t grab anything larger than methane or carbon dioxide. Researchers at the University of Cambridge made the new liquid from tetrahedrons of zinc surrounded by coordinating ligands (Nat. Chem. 2020, DOI: 10.1038/s41557-020-0419-2).
Chemists at the University of Virginia synthesized this radical that contains beryllium in the +1 oxidation state by oxidizing a previously reported compound containing Be(II) (J. Am. Chem. Soc. 2020, DOI: 10.1021/jacs.9b13777). Compounds with main-group elements with low oxidation states could participate in chemistry typically seen only in transition metals.
Chemists at Northwestern University designed a molecular machine that uses redox chemistry to thread rings two at a time onto a polymer chain (Science 2020, DOI: 10.1126/science.abb3962). The researchers would like to use this system to build polyrotaxanes for information storage by encoding data in the sequence of rings.
For more than a decade, chemists have thought that rhodium boride contains a triple bond. Using vibrational spectroscopy and theoretical calculations, researchers at Brown University discovered that the bond is likely a quadruple bond instead (J. Phys. Chem. Lett. 2020, DOI: 10.1021/acs.jpclett.9b03484).
Researchers at the University of Manchester used metal ions to tie molecular strings into two types of knots. Adding lutetium ions alone or in combination with copper ions leads to symmetrical trefoil knots or asymmetrical three-twist knots, respectively (Nature 2020, DOI: 10.1038/s41586-020-2614-0).