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

Synthesis

Safer Synthesis Of Fluorophosphate Crystals

Method for making analogs of metal oxides avoids hydrofluoric acid

by Jyllian N. Kemsley
May 23, 2011 | APPEARED IN VOLUME 89, ISSUE 21

[+]Enlarge
Credit: Mark Weller/U of Southampton
Crystalline Na4Mn2F6(P2O7) has fluoride-lined channels through which cations can move; Mn = dark green, F = light green, P = blue, O = red, Na = yellow.
Credit: Mark Weller/U of Southampton
Crystalline Na4Mn2F6(P2O7) has fluoride-lined channels through which cations can move; Mn = dark green, F = light green, P = blue, O = red, Na = yellow.

A straightforward route to preparing transition-metal fluorophosphate crystals has been described by researchers at the University of Southampton, in England, opening a new family of complexes to potential applications in energy storage, magnetic, and catalytic materials (J. Am. Chem. Soc., DOI: 10.1021/ja201096b). Metal oxide frameworks have long been popular for such uses. Replacing the oxide with fluoride is one way to alter the materials’ chemistry, dimensions, and performance. Jennifer A. Armstrong, Edward R. Williams, and Mark T. Weller combined anhydrous transition-metal fluorides with phosphoric acid and a fluoride salt or structure-directing agent, heated the mixture in a hydrothermal bomb, and allowed the products to crystallize. The approach eliminates the need for hydrofluoric acid, making synthesis easier and safer, the authors say. So far, they’ve prepared 45 Mn(III), Fe(III), Co(II), and Cu(II) complexes and characterized some of them in ion-exchange reactions, in lithium-insertion reactions of interest for rechargeable batteries, and in magnetic-susceptibility tests. The group observed that the fluoride ions often bridge metal sites, and the frameworks have fluoride-lined channels that aid cation mobility.

X

Article:

This article has been sent to the following recipient:

Leave A Comment

*Required to comment