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Scientists create first intermetallic double salt with platinum

Date:
November 23, 2016
Source:
DOE/Ames Laboratory
Summary:
Scientists report that they have created the first intermetallic double salt with platinum. Cesium platinide hydride, or 4Cs2Pt?CsH, forms a translucent ruby red crystal and can exist only in an inert environment similar to conditions that exist in outer space. It’s a new member of a rare family of compounds in which a metal forms a truly negatively charged ion.
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Cesium platinide hydride forms a translucent ruby red crystal and can exist only in an inert environment similar to conditions that exist in outer space.
Credit: Ames Laboratory, US Department of Energy

Scientists at the U.S. Department of Energy's Ames Laboratory are being credited with creating the first intermetallic double salt with platinum.

Materials researchers Anja-Verena Mudring and Volodymyr Smetana were the first to create and accurately characterize the compound. Cesium platinide hydride, or 4Cs2Pt.CsH, forms a translucent ruby red crystal and can exist only in an inert environment similar to conditions that exist in outer space. It's a new member of a rare family of compounds in which a metal forms a truly negatively charged ion.

"It's a compound that as a researcher you have trouble envisioning that it can even exist, but once you do have it and can analyze it, it's nothing like what you expect," said Mudring. "Instead of creating a gray, shiny alloy as typically observed for many hydrogen storage materials by reacting the metals cesium and platinum with hydrogen, these red crystals form. They are really quite beautiful."

This intriguing new compound was initially extracted from a cesium melt. The compound is highly unstable, with the platinum in the compound returning to its elemental state if it is exposed to oxygen. Since first detected it took a long time to understand its true nature and prove the composition. Single crystal studies combined with powder X-ray diffraction, solid-state nuclear magnetic resonance and deep theoretical investigations allowed researchers to prove its existence. Its unusual structure and properties, so different from typical intermetallic hydrides, are explained by the strong influence of relativistic effects on both cesium and platinum.

"It's unique. It's the first example we have of a salt with so strongly negatively charged metal ions. Moreover, you mix an alloy with a salt and get another non-conducting salt," said Mudring. "This allows for some deep insight into the nature of chemical bonding -- and as Goethe wrote, ultimately what holds the world and its compounds together in its inmost form."

The research is further discussed in a paper published in and featured on the cover of the current issue of Angewandte Chemie, "Cesium Platinide Hydride 4Cs2Pt.CsH: An Intermetallic Double Salt Featuring Metal Anions," by Volodymyr Smetana and Anja-Verena Mudring.


Story Source:

Materials provided by DOE/Ames Laboratory. Note: Content may be edited for style and length.


Journal Reference:

  1. Volodymyr Smetana, Anja-Verena Mudring. Cesium Platinide Hydride 4Cs2Pt⋅CsH: An Intermetallic Double Salt Featuring Metal Anions. Angewandte Chemie International Edition, 2016; 55 (47): 14838 DOI: 10.1002/anie.201606682

Cite This Page:

DOE/Ames Laboratory. "Scientists create first intermetallic double salt with platinum." ScienceDaily. ScienceDaily, 23 November 2016. <www.sciencedaily.com/releases/2016/11/161123142621.htm>.
DOE/Ames Laboratory. (2016, November 23). Scientists create first intermetallic double salt with platinum. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2016/11/161123142621.htm
DOE/Ames Laboratory. "Scientists create first intermetallic double salt with platinum." ScienceDaily. www.sciencedaily.com/releases/2016/11/161123142621.htm (accessed May 26, 2017).

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