Specific chemistry of the anions: [TaOF5]2-, [TaF6]-, and [TaF7]2-

Hongcheng Lu, Romain Gautier, Martin D. Donakowski, Lindsay Fuoco, Zhengtang Liu, Kenneth R. Poeppelmeier*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The controlled crystallization of specific tantalum oxide-fluoride and tantalum fluoride anions ([TaOF5]2-, [TaF 6]-, and [TaF7]2-) is demonstrated using organic reagents with varied corresponding pKa values in the presence of aqueous hydrofluoric acid. The identity of tantalum oxide-fluoride or fluoride anions of [TaOF5]2-, [TaF6] -, and [TaF7]2- are shown to crystallize successively from solution to solid state by increasing the corresponding pKa of organic reagents, which lead to the subsequent increase of fluoride concentration in the hydrofluoric acid solution. With the use of this methodology, three new hybrid crystal structures were targeted: [H 2(2,2′-bpy)]TaOF5 (2,2′-bpy = 2,2′-bipyridyl) 1, [Hdpa]TaF6 (dpa = 2,2′-dipyridylamine) 2, and [H2En]TaF7 (En = ethylenediamine) 3, respectively. The applicability and comparison of this methodology for tantalum and previously prepared niobium compounds show that it can be broadly used to design new materials with specific functionalities for other transition metal oxide-fluorides.

Original languageEnglish (US)
Pages (from-to)844-850
Number of pages7
JournalCrystal Growth and Design
Issue number2
StatePublished - Feb 5 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


Dive into the research topics of 'Specific chemistry of the anions: [TaOF5]2-, [TaF6]-, and [TaF7]2-'. Together they form a unique fingerprint.

Cite this