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

Woongchul Shin; Kyuchul Shin; Jiwoong Seol; Dong Yeun Koh; Seongmin Park; Huen Lee

doi:10.1021/jp1094273

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

Woongchul Shin, Kyuchul Shin, Jiwoong Seol, Dong Yeun Koh, Seongmin Park, Huen Lee

Korea Advanced Institute of Science and Technology

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

6 Scopus citations

Abstract

The 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^-.

Original language	English
Pages (from-to)	2558-2562
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	5
DOIs	https://doi.org/10.1021/jp1094273
State	Published - 10 Feb 2011

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

abstract = "The 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-.",

author = "Woongchul Shin and Kyuchul Shin and Jiwoong Seol and Koh, {Dong Yeun} and Seongmin Park and Huen Lee",

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doi = "10.1021/jp1094273",

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T1 - Metastability of ethane clathrate hydrate induced by [Co(NH 3)6]3+ complex

AU - Shin, Woongchul

AU - Shin, Kyuchul

AU - Seol, Jiwoong

AU - Koh, Dong Yeun

AU - Park, Seongmin

AU - Lee, Huen

PY - 2011/2/10

Y1 - 2011/2/10

N2 - The 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-.

AB - The 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-.

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ER -

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

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