ADVERTISEMENT
2 /3 FREE ARTICLES LEFT THIS MONTH Remaining
Chemistry matters. Join us to get the news you need.

If you have an ACS member number, please enter it here so we can link this account to your membership. (optional)

ACS values your privacy. By submitting your information, you are gaining access to C&EN and subscribing to our weekly newsletter. We use the information you provide to make your reading experience better, and we will never sell your data to third party members.

ENJOY UNLIMITED ACCES TO C&EN

Inorganic Chemistry

Terbium complex with +4 oxidation state synthesized

Could other lanthanides also form +4 complexes?

by Laura Howes
June 15, 2019 | APPEARED IN VOLUME 97, ISSUE 24

09724-scicon9-structure1cxd.jpg
Credit: Marinella Mazzanti
Structure of [Tb(OSi(OtBu)3)4], Tb = green; O = red; Si = orange; tBu = gray.

Down toward the bottom of the periodic table lie the lanthanides. These f-block elements form complexes in which the metals usually exist in the +3 or, more recently, +2 oxidation states. The only lanthanide known to form molecular Ln4+ compounds was cerium. But researchers at the Swiss Federal Institute of Technology, Lausanne (EPFL), led by Marinella Mazzanti, now show that terbium can also form compounds with a +4 oxidation state (J. Am. Chem. Soc. 2019, DOI: 10.1021/jacs.9b05337). Perhaps, they say, other lanthanides can too. To make the Tb4+ complex, the team first synthesized a complex containing electron-rich tetrakis(tert-butoxy) siloxide ligands and two metal centers, potassium and terbium(III). They then oxidized it with a strong oxidizing agent to give [Tb(OSi(Ot-Bu)3)4]. The team confirmed the oxidation state of terbium with electron paramagnetic resonance and magnetometry and also measured the Tb3+/Tb4+ redox potential. Ce4+ compounds have a high oxidizing power that has led to applications in catalysis and material science. Perhaps, Mazzanti hopes, these applications could be expanded with other Ln4+ ions.

X

Article:

This article has been sent to the following recipient:

Leave A Comment

*Required to comment