Hydroquinone hydrogen sulphide

The heat capacity of the hydroquinone hydrogen sulphide clathrate (x = 0.95) was measured between 1 and 300 K [13]. A peak occurred at (7.6 0.1) K. No anomaly was found above that temperature. The... 

Hydrogen cyanide Calcium cyanide Potassium cyanide Sodium cyanide Hydrogen fluoride as F Hydrogen peroxide Hydrogen selenide as Se Hydrogen sulphide Hydroquinone... 

Hydrogen qranide Hydrogen fluoride Hydrogen sulphide Hydroquinone... 

Low temperature properties of hydroquinone clathrate of small polar molecules are also of interest because of the possibility they offer to the study of low-lying rotational levels of the molecules. In the neat (i.e., non-clathrate) crystal of hydrogen chloride, hydrogen sulphide and other small molecules, strong intermolecular interaction prohibits rotation of the molecules. But a cavity is formed by the rigid host lattice for each of the guest molecules in the clathrate. Therefore, they can rotate rather freely in the approximately spherical potential of the wall. 

Previously we showed that the dipole-dipole interaction between the guest molecules has an appropriate magnitude to explain the phase transitions in the hydroquinone clathrate compounds [14,17]. We have now two more substances to compare with the model the phase transition in the hydrogen sulphide compound and the ordered structure of the acetonitrile compound. A Monte Carlo calculation showed that no phase tran-... 

Figure 4 shows the transition temperature of the hydroquinone clathrate compound plotted against the square of the dipole moment of the guest molecule. The data on the hydrogen sulphide, methanol and hydrogen cyanide compounds are those of the heat capacity anomalies. The transition temperature of the acetonitrile compound, if it exists, lies above the room temperature. One finds a good proportionality between the transition temperature and the square of the dipole moment. 

Hydrocarbon carotenoids, 3369 Hydrodistillation, 3290 Hydrodynamic, 2147, 2148, 2163 Hydrogen peroxide (H2O2), 3712 Hydrogen sulphide, 3677 Hydroindole alkaloids, 1168 ot/p-Hydrolase, 3596 Hydrolysable tannins, 1559 Hydrolysate of Polygalasaponins, 3219 Hydrolysis, 1085, 2805,4069 Hydromorphone, 1376 Hydrophilic interaction, 1181 Hydrophilic interaction chromatography (HILIC), 58,1023, 1086 Hydrophobicity, 2115 Hydroquinone, 4065 Hydrostatic, 2147 Hydrostatic pressure, 1698, 1699 Hydrotaea irritans, 4069 Hydrotropes, 3330 Hydrotropic extraction, 3330 Hydrotropic solubilization, 3331 Hydroxamic acid, 986... 

---