Thermal Properties and Transition Behavior of Host-Guest Compounds Under High Pressure

Andersson, Ove; Nakazawa, Yasuhiro

doi:10.2174/1877944104666140825201943

Cited by 5 publications

(1 citation statement)

References 122 publications

(204 reference statements)

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“…Finally, the δ form of HQ, reported by Naoki and co-workers in 1999, exists only at high pressure and temperature (for example, the α to δ transition temperature and the melting temperature of the δ phase were estimated at ∼170.2 °C and ∼191.4 °C, respectively, at 785 bar) . Although this new δ phase exhibits interesting properties, for example, a heat capacity much higher than that of α phase (close to that of the liquid), its structure is unknown to date …”

Section: Introductionmentioning

confidence: 94%

CO₂–Hydroquinone Clathrate: Synthesis, Purification, Characterization and Crystal Structure

Torré

Coupan

Chabod

et al. 2016

Crystal Growth & Design

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Organic clathrate compounds, particularly those formed between hydroquinone (HQ) and gases, are supramolecular entities recently highlighted as promising alternatives for applications such as gas storage and separation processes. This study provides new insights into CO 2 −HQ clathrate, which is a key structure in some of the proposed future applications of these compounds. We present a novel synthesis and purification of CO 2 −HQ clathrate monocrystals. Clathrate crystals obtained from a single synthesis and native HQ are characterized and compared using Raman/Fourier transform infrared/NMR spectroscopies, optical microscopy, and thermogravimetric analysis coupled to mass spectrometry. The molecular structure of the clathrate has been resolved by X-ray diffraction analysis, and detailed crystallographic information is presented for the first time.

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Section: Introductionmentioning

confidence: 94%

CO₂–Hydroquinone Clathrate: Synthesis, Purification, Characterization and Crystal Structure

Torré

Coupan

Chabod

et al. 2016

Crystal Growth & Design

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Revisiting the thermodynamic modelling of type I gas–hydroquinone clathrates

Conde

Torré

Miqueu

2016

Phys. Chem. Chem. Phys.

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Under specific pressure and temperature conditions, certain gaseous species can be engaged in a host lattice of hydroquinone molecules, forming a supramolecular entity called a gas hydroquinone clathrate. This study is devoted to the thermodynamic modelling of type I hydroquinone clathrates. The gases considered in this work are argon, krypton, xenon, methane, nitrogen, oxygen and hydrogen sulphide. The basic van der Waals and Platteeuw model, which is, for example, not able to predict well the phase equilibrium properties of such clathrates at high temperature, is modified and extended by considering first the solubility of the guest in solid HQ and then the mutual interactions between the gaseous molecules inside the clathrate structure (i.e. guest-guest interactions). Other improvements of the basic theory, such as the choice of the reference state, are proposed, and a unique set of thermodynamic parameters valid for all the studied guests are finally calculated. Very good agreement is obtained between the model predictions and the experimental data available in the literature. Our results clearly demonstrate that the highest level of theory is necessary to describe well both the triphasic equilibrium line (where the HQ clathrate, the native hydroquinone HQα and the gas coexist), the occupancy of the guest in the clathrate, and the intercalation enthalpy.

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Effect of the cation sublattice composition of tin-based type-I clathrates on their low-temperature thermal properties

et al. 2018

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We performed an experimental study on thermal properties of the Sn18In6As21.5I8 clathrate by measuring temperature dependencies of its heat capacity (2-300 K) and thermal expansion (5-300 K). By comparing the results with those published previously for Sn-based clathrates Sn24P19.2I8, Sn20Zn4P20.8I8, and Sn17Zn7P22I8, we established that partial replacement of tin and phosphorus by heavier indium and arsenic, respectively, leads to lowering vibration frequencies in both host and guest substructures. Deviation of the observed thermal properties at low temperatures from those predicted by the Einstein-Debye model is caused by the Schottky-like contribution of two-level systems to heat capacity and thermal expansion. These systems form owing to transitions of guest atoms in non-spherical 24-vertex cages between stationary states with close energies.

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Thermal Properties and Transition Behavior of Host-Guest Compounds Under High Pressure

Cited by 5 publications

References 122 publications

CO₂–Hydroquinone Clathrate: Synthesis, Purification, Characterization and Crystal Structure

CO₂–Hydroquinone Clathrate: Synthesis, Purification, Characterization and Crystal Structure

Revisiting the thermodynamic modelling of type I gas–hydroquinone clathrates

Effect of the cation sublattice composition of tin-based type-I clathrates on their low-temperature thermal properties

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Thermal Properties and Transition Behavior of Host-Guest Compounds Under High Pressure

Cited by 5 publications

References 122 publications

CO2–Hydroquinone Clathrate: Synthesis, Purification, Characterization and Crystal Structure

CO2–Hydroquinone Clathrate: Synthesis, Purification, Characterization and Crystal Structure

Revisiting the thermodynamic modelling of type I gas–hydroquinone clathrates

Effect of the cation sublattice composition of tin-based type-I clathrates on their low-temperature thermal properties

Contact Info

Product

Resources

About

CO₂–Hydroquinone Clathrate: Synthesis, Purification, Characterization and Crystal Structure

CO₂–Hydroquinone Clathrate: Synthesis, Purification, Characterization and Crystal Structure