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

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Abstract

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
Pages (from-to)844-850
Number of pages7
JournalCrystal Growth and Design
Volume14
Issue number2
DOIs
Publication statusPublished - Feb 5 2014

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ASJC Scopus subject areas

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

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