Ammonia uptake and release in the MnX2–NH3 (X = Cl, Br) systems and structure of the Mn(NH3)nX2 (n = 6, 2) ammines

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(NH3)6X2 (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(NH3)6X2 complexes occurred in three stages corresponding to the release of 4, 1 and 1 NH3 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
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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
446531SUPERGEN programme renewalDuncan GregoryEngineering & Physical Sciences Research Council (EPSRC)EP/E040071/1CHEM - CHEMISTRY
557701Crossing Boundaries in Energy StorageDuncan GregoryEngineering & Physical Sciences Research Council (EPSRC)EP/I022570/1CHEM - CHEMISTRY