University of Iowa Scientists Isolate Terbium Plus-4

Researchers successfully shifted terbium into a plus-4 oxidation state using specialized molecular cages.

Updated on Oct. 27, 2026 in Chemistry

A close-up macro image of a geometric tungsten-oxygen crystalline structure holding a single glowing sphere in its center. — University of Iowa chemists have successfully isolated terbium in a plus-4 oxidation state, a breakthrough achieved by housing the atom within a specialized tungsten-oxygen molecular cage. AI Illustration. Upload story photo >

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On July 16, 2026, researchers at the University of Iowa announced they had successfully isolated terbium in a plus-4 oxidation state. This breakthrough was detailed in a study published in Nature Communications.

Why it matters

Terbium typically resists losing electrons because it strongly favors a stable plus-3 oxidation state. This achievement marks a significant technical advancement in controlling the properties of rare earth elements.

Chemists successfully shifted terbium to a plus-4 oxidation state by caging atoms in polyoxometalates and using potassium persulfate to remove an electron. The experiment was conducted under standard ambient laboratory conditions.

The players

University of Iowa

A public research university in Iowa City where the chemistry experiment was conducted.

The details

The team constructed a protective molecular assembly made of tungsten and oxygen to house the terbium atom. This cage acted as a stable environment, allowing the chemists to trigger the rare oxidation shift without requiring extreme temperature or pressure controls.

July 16, 2026: Research findings were published in Nature Communications.

The Big Picture

This success marks a fundamental shift in how chemists can manipulate rare earth elements that typically resist electronic changes. By extending this methodology to the actinide series of elements, researchers aim to unlock new chemical properties previously deemed unreachable.

This research provides a new pathway for scientists to refine the separation and utility of rare earth metals used in high-tech manufacturing. Future applications may lead to more efficient processing methods for elements essential to modern electronics.

The takeaway

This study demonstrates that complex chemical states can be achieved under ambient conditions using precise molecular engineering. Such techniques may eventually streamline how industries manage and utilize rare earth materials sourced from regions like China and the United States.