Reardon, H., Hanlon, J. M., Grant, M., Fullbrook, I. and Gregory, D. H. (2012) Ammonia uptake and release in the MnX2–NH3 (X = Cl, Br) systems and structure of the Mn(NH3)nX2 (n = 6, 2) ammines. Crystals, 2(4), pp. 193-212. (doi:10.3390/cryst2020193)
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Publisher's URL: http://dx.doi.org/10.3390/cryst2020193
Abstract
Hexa-ammine complexes, Mn(NH<sub>3</sub>)<sub>6</sub>X<sub>2</sub> (X = Cl, Br), have been synthesized by ammoniation of the corresponding transition metal halide and characterized by Powder X-ray diffraction (PXRD) and Raman spectroscopy. The hexa-ammine complexes are isostructural (Cubic,Fm-3m, Z = 4; a = 10.2742(6) Å and 10.527(1) Å for X = Cl, Br respectively). Temperature programmed desorption (TPD) demonstrated that ammonia release from Mn(NH<sub>3</sub>)<sub>6</sub>X<sub>2</sub> complexes occurred in three stages corresponding to the release of 4, 1 and 1 NH<sub>3</sub> equivalents respectively. The chloride and bromide both exhibit a deammoniation onset temperature below 323 K. The di-ammoniates from the first desorption step were isolated during TPD measurements and their crystal structures determined by Rietveld refinement against PXRD data (X = Cl: orthorhombicCmmm, a = 8.1991(9) Å, b = 8.2498(7) Å, c = 3.8212(4) Å, Z = 2; X = Br: orthorhombic Pbam, a = 6.0109(5) Å, b = 12.022(1) Å, c = 4.0230(2) Å, Z= 2).
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Reardon, Miss Hazel and Hanlon, Dr James and Fullbrook, Miss Imogen and Gregory, Professor Duncan |
Authors: | Reardon, H., Hanlon, J. M., Grant, M., Fullbrook, I., and Gregory, D. H. |
College/School: | College of Science and Engineering > School of Chemistry |
Journal Name: | Crystals |
Publisher: | MDPI |
ISSN: | 2073-4352 |
ISSN (Online): | 2073-4352 |
Copyright Holders: | Copyright © 2012 The Authors |
First Published: | First published in Crystals 2(4):193-212 |
Publisher Policy: | Reproduced under a Creative Commons License |
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