Metastability of ethane clathrate hydrate induced by [Co(NH 3)6]3+ complex

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DOIResolve DOI: http://doi.org/10.1021/jp1094273
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TypeArticle
Journal titleThe Journal of Physical Chemistry C
ISSN1932-7447
Volume115
Issue5
Pages25582562; # of pages: 5
SubjectBrine rejections; Clathrate hydrate; Cobalt complexes; Host lattice; Hydrate formation; Metastabilities; Metastable structures; NMR spectrum; Water cage; Cobalt; Ethane; Hydrates; Hydration; Ions; Metal complexes; Metastable phases; Nuclear magnetic resonance spectroscopy; Cobalt compounds
AbstractThe metal complex of [Co(NH3)6]3+ is introduced to C2H6 hydrate to confirm its possible inclusion in hydrogen-bonded water cages and the occurrence of metastable structure. The 13C NMR spectra of C2H6 + ([Co(NH3)6]Cl3 + 6NaOH in D2O) hydrate confirmed a new peak at 6.5 ppm matching with C2H6 in sII-L cages. The retarded appearance of metastable sII phase is due to brine rejection of the cobalt complex occurring during solution freezing. The anions of OH- and F- were found to be incorporated in the host water cage framework, providing proton-deficient sites. The ionic conductivity of the frozen [Co(NH3)6]3+ solution increased up to 20-fold after ethane hydrate formation, implying the incorporation of F- into the host lattice. A notable finding of this work is that the metastability occurs only when the cobalt complex is in the presence of anions such as OH- and F-. © 2011 American Chemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21271670
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Record identifier4d87e8fd-b930-4b73-a7bf-d71489f48968
Record created2014-03-24
Record modified2017-03-23
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