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

doi:10.1016/j.chemphys.2013.05.006

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

School of Chemistry

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	38-43
Number of pages	6
Journal	Chemical Physics
Volume	427
DOIs	https://doi.org/10.1016/j.chemphys.2013.05.006
Publication status	Published - 12 Dec 2013

Keywords

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

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10.1016/j.chemphys.2013.05.006

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title = "The structure and desorption properties of the ammines of the group II halides",

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.",

keywords = "Ammonia storage, Group II halide ammine, Desorption, Thermogravimetric analysis, NMR, HYDROGEN STORAGE, PRINCIPLES, SALTS",

author = "Jones, \{Martin Owen\} and Royse, \{David M.\} and Edwards, \{Peter P.\} and David, \{William I. F.\}",

year = "2013",

month = dec,

day = "12",

doi = "10.1016/j.chemphys.2013.05.006",

language = "English",

volume = "427",

pages = "38--43",

journal = "Chemical Physics",

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T1 - The structure and desorption properties of the ammines of the group II halides

AU - Jones, Martin Owen

AU - Royse, David M.

AU - Edwards, Peter P.

AU - David, William I. F.

PY - 2013/12/12

Y1 - 2013/12/12

N2 - 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.

AB - 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.

KW - Ammonia storage

KW - Group II halide ammine

KW - Desorption

KW - Thermogravimetric analysis

KW - NMR

KW - HYDROGEN STORAGE

KW - PRINCIPLES

KW - SALTS

UR - https://www.scopus.com/pages/publications/84890122315

U2 - 10.1016/j.chemphys.2013.05.006

DO - 10.1016/j.chemphys.2013.05.006

M3 - Article

SN - 0301-0104

VL - 427

SP - 38

EP - 43

JO - Chemical Physics

JF - Chemical Physics

ER -

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

Abstract

Keywords

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