The structure and desorption properties of the ammines of the group II halides

Martin Owen Jones*, David M. Royse, Peter P. Edwards, William I. F. David

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The synthesis of the magnesium halide ammines (Mg(NH3)(6)Cl-2, Mg(NH3)(6)Br-2 and Mg(NH3)(6)I-2) is reported and their structures are identified by high resolution X-ray diffraction. The structures of Mg(NH3)(6)Br-2 and Mg(NH3)(6)I-2 are reported for the first time. The desorption properties of Mg(NH3)(6)Cl-2, Mg(NH3)(6)Br-2 and Mg(NH3)(6)I-2 are examined by thermogravimetric analysis and NMR, and the trends in desorption properties as a function of composition are interpreted using a simple ionic model. It is found that the desorption properties are dependent on the lattice enthalpy of the intermediate and final phases Mg(NH3)(2)X-2, Mg(NH3)X-2 and MgX2, that the anion has limited effect on the state of Mg-N bonding and that the desorption temperature of ionic ammines may be tuned by varying the size of the anion. (C) 2013 Elsevier B. V. All rights reserved.

Original languageEnglish
Pages (from-to)38-43
Number of pages6
JournalChemical Physics
Volume427
DOIs
Publication statusPublished - 12 Dec 2013

Keywords

  • Ammonia storage
  • Group II halide ammine
  • Desorption
  • Thermogravimetric analysis
  • NMR
  • HYDROGEN STORAGE
  • PRINCIPLES
  • SALTS

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