Mysterious aspect promethium lastly reveals its chemical properties

A brand new compound containing one of many rarest components on this planet, promethium, has revealed its mysterious properties for the primary time.

Promethium solely exists naturally in minuscule quantities – Earth’s crust comprises nearly half a kilogram of the aspect. In 1945, researchers at Oak Ridge Nationwide Laboratory in Tennessee managed to supply it as a byproduct of the Manhattan Venture’s plutonium enrichment programme. Its nuclear origins led to its identify, after the Greek titan Prometheus, who stole hearth and introduced it to people.

It’s now routinely produced, albeit in tiny portions, from the radioactive decay of uranium and could be included in easy compounds for makes use of like luminous paint or nuclear batteries. However its extraordinarily radioactive nature means it’s inherently unstable, making it troublesome to type long-lasting compounds which are simple to check. The crystal buildings that it does exist in additionally exert forces on promethium’s chemical bonds, obscuring its basic chemistry, reminiscent of how lengthy its atomic bonds are and the way they type with different compounds.

Now, Alexander Ivanov at Oak Ridge Nationwide Laboratory and his colleagues have discovered a solution to type a promethium compound in water. This dampens a number of the damaging results of radioactivity and avoids the obscuring results of crystal buildings, permitting the group to check the aspect’s chemistry intimately for the primary time.

First, they synthesised a compound referred to as bispyrrolidine diglycolamide (PyDGA), which is predicated on molecules that type compounds with components just like promethium. When promethium was added to this molecule in an answer, it shaped the compound Pm-PyDGA, which has a brilliant pink color as a consequence of its electron construction.

Ivanov and his group then fired X-rays on the compound and measured which frequencies it absorbed, revealing how the promethium was chemically bonded. This confirmed that the bond size between promethium and close by oxygen atoms was a few quarter of a nanometre, which matched laptop simulations they’d run.

“It’s rather beautiful chemistry, and to see the delicate pink colour of this complex is a real joy,” says Andrea Sella at College School London.

Details about promethium’s bonding behaviour will assist enhance processes for producing purer samples in bigger portions from radioactive waste, says Ivanov, and may be used to design new medical compounds, reminiscent of for radioactive imaging or most cancers therapy. “This kind of fundamental information could help us to drive new technologies,” he says.