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Ammonia Uptake and Release in the MnX2–NH3 (X = Cl, Br) Systems and Structure of the Mn(NH3)nX2 (n = 6, 2) Ammines
- Source :
- Crystals, Volume 2, Issue 2, Pages 193-212, Crystals, Vol 2, Iss 2, Pp 193-212 (2012)
- Publication Year :
- 2012
- Publisher :
- Molecular Diversity Preservation International, 2012.
-
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<br />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: orthorhombic Cmmm, a = 8.1991(9) Å, b = 8.2498(7) Å, c = 3.8212(4) Å, Z = 2<br />X = Br: orthorhombic Pbam, a = 6.0109(5) Å, b = 12.022(1) Å, c = 4.0230(2) Å, Z = 2).
- Subjects :
- chloride
Thermal desorption spectroscopy
General Chemical Engineering
Inorganic chemistry
02 engineering and technology
Crystal structure
010402 general chemistry
01 natural sciences
hydrogen storage
Inorganic Chemistry
ammonia storage
chemistry.chemical_compound
Transition metal
Bromide
lcsh:QD901-999
General Materials Science
structure
Isostructural
Raman
bromide
Rietveld refinement
ammines
021001 nanoscience & nanotechnology
Condensed Matter Physics
0104 chemical sciences
3. Good health
Crystallography
chemistry
manganese
Orthorhombic crystal system
lcsh:Crystallography
0210 nano-technology
Powder diffraction
Subjects
Details
- Language :
- English
- ISSN :
- 20734352
- Database :
- OpenAIRE
- Journal :
- Crystals
- Accession number :
- edsair.doi.dedup.....a92dda648d31952d488dbaf9c7c7c305
- Full Text :
- https://doi.org/10.3390/cryst2020193