Reactions of Beryllium Halides in Liquid Ammonia: The Tetraammineberyllium Cation [Be(NH3)4]2+, its Hydrolysis Products, and the Action of Be2+as a Fluoride-Ion Acceptor

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • University of Eastern Finland
  • Technische Universität München

Abstract

The first structural characterization of the text-book tetraammineberyllium(II) cation [Be(NH3)4]2+, obtained in the compounds [Be(NH3)4]2Cl4.17NH3 and [Be(NH3)4]Cl2, is reported. Through NMR spectroscopic and quantum chemical studies, its hydrolysis products in liquid ammonia were identified. These are the dinuclear [Be2(mu-OH)(NH3)6]3+ and the cyclic [Be2(mu-OH)2(NH3)4]2+ and [Be3(mu-OH)3(NH3)6]3+ cations. The latter species was isolated as the compound [Be3(mu-OH)3(NH3)6]Cl3.7NH3. NMR analysis of solutions of BeF2 in liquid ammonia showed that the [BeF2(NH3)2] molecule was the only dissolved species. It acts as a strong fluoride-ion acceptor and forms the [BeF3(NH3)]- anion in the compound [N2H7][BeF3(NH3)]. The compounds presented herein were characterized by single-crystal X-ray structure analysis, 9Be, 17O, and 19F NMR, IR, and Raman spectroscopy, deuteration studies, and quantum chemical calculations. The extension of beryllium chemistry to the ammine system shows similarities but also decisive differences to the aquo system.

Details

Original languageEnglish
Pages (from-to)2131-2142
Number of pages12
JournalCHEMISTRY: A EUROPEAN JOURNAL
Volume18
Issue number7
Publication statusPublished - Feb 2012
MoE publication typeA1 Journal article-refereed

    Research areas

  • ab initio calculations, beryllium, halides, NMR spectroscopy, X-ray diffraction, LIGAND-EXCHANGE PROCESSES, CRYSTAL-STRUCTURE, X-RAY, COORDINATION CHEMISTRY, NEUTRON-DIFFRACTION, POLY(PYRAZOLYL)BORATE LIGANDS, STRUCTURAL-CHARACTERIZATION, SULPHATE TETRAHYDRATE, SIZE DISCRIMINATION, SYSTEMATIC AFFINITY

ID: 6676959