Thermodynamic and crystallographic properties depending on hydration numbers in tetra-n-butylammonium chloride semiclathrate hydrates

Oshima, Motoi; Jin, Yusuke; Kida, Masato; Nagao, Jiro

doi:10.1016/j.jct.2019.106004

Cited by 6 publications

(1 citation statement)

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“…The residual electron density in the distorted D cavities (each of them have three pressed-in vertices) was solved as the oxygen atoms of “guest” water molecule. In ref it was also shown that the diffraction patterns of TBAC polyhydrates with different hydrate numbers within the range of 26.4≤ n ≤ 33.2 have slight differences, but they all refer to the tetragonal hydrate structure.…”

Section: Structures Of the Ionic Clathrate Hydrates Of Tiaa Tba And T...mentioning

confidence: 99%

Ionic Clathrate Hydrates of Tetraalkylammonium/phosphonium Salts: Structures, Properties, Some Applications, and Perspectives

2022

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Ionic clathrate hydrates (ICHs) belong to one of the groups of a wide class of clathrate hydrates. In the crystal structures of ICHs, cation–anion pairs of guest molecules, typically tetraalkylammonium/phosphonium salts, are included into the host framework of hydrogen-bonded water molecules. Because of their suitable phase change temperature and latent heat, ICHs are considered as promising phase change materials for application in cold energy storage and transportation. The presence of vacant cavities in ICHs structures, which can incorporate small gas molecules such as, for example, H2, CH4, CO2, N2, H2S, determines the possibility of their use for the separation and storage of gases. The formation of these double ICHs occurs under much milder pressure and temperature conditions compared to the pure gas hydrates of the same gases. Studying of the structural characteristics and thermophysical properties of ICHs and double ICHs with gases is the necessary basis for their effective applications in different practical ends. This work reviews information related to the new details and features of the structures of ICHs and double ICHs with gases revealed over the last decade or a little more as well as some thermophysical data such as hydrate numbers, temperatures and enthalpies of dissociation. This review focuses only on ICHs of tetrabutyl-, tetraisoamylammonium (TBA, TiAA), and tetrabutylphosphonium (TBP) salts, which are the most common representatives of this class of compounds. One of the sections is devoted to ICHs of TBA and TiAA with polymeric anions such as cross-linked polyacrylates. The purpose of the present paper is to review the studies that have been relatively little addressed in previous works.

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Section: Structures Of the Ionic Clathrate Hydrates Of Tiaa Tba And T...mentioning

confidence: 99%