Rubidium tris

At this point the hygroscopic potassium salt may be isolated and dried, or, more conveniently, the potassium salt may be dissolved in water and the carborane anion precipitated with one of a variety of large cations, such as the rubidium, cesium, tetramethylammonium, or trimethylammonium ions. The tri-methylammonium salt of the carborane anion is useful because it is readily purified by recrystallization from water and may be easily converted in solution to salts containing other counterions. ... 

Potassium 2,4,6-tris(dioxoselena)hexahydrotriazine-l,3,5-triide, 4672 Rhenium nitride tetrafluoride, 4344 Rubidium nitride, 4727... 

D. L. Chapman, for potassium tri-iodide. 0. Gropp measured the effect of temp, on the conductivity of solid and frozen soln. of sodium iodide. For the effect of press, on the electrical properties, vide alkali chlorides. A. Reis found the free energy for the separation of the ions of K1 to be 144 lrilogrm. cals, per mol. for iN al, 158 Lil, 153 and for HI, 305. S. W. Serkofi 35 measured the conductivity of lithium iodide in methyl alcohol P. Walden, of sodium iodide in acetonitrile P. Dutoit in acetone, benzonitrite, pyridine, acetophenone. J. C. Philip and H. R. Courtman, B. B. Turner, J. Fischler, and P. Walden of potassium iodide in methyl or ethyl alcohol J. C. Philip and H. P. Courtman in nitromethane P. Dutoit in acetone. H. C. Jones, of rubidium iodide in formamide. S. von Lasczynsky and S. von Gorsky, of potassium and sodium iodides in pyridine. A. Heydweiller found the dielectric constants of powdered and compact potassium iodide to be respectively 3 00 and 5 58. 

The increased solubility is due to the formation of polyiodides, and evidence of the existence of iodides as high as the enna-salt, KIfl, has been previously discussed. The tri-iodides of potassium, rubidium, and caesium have all been isolated. The m.p., temp, of whitening, and the axial ratios of the crystals of potassium, rubidium, and caesium tri-iodides are indicated—Table XXXI—vide Fig. 19, 2. 19, 16. 

In an attempt to stabilize the highly conducting a-Agl phase at lower temperatures, various anionic and cationic substitutions have been tried. The most successftd so far has been the replacement of silver by rubidium in RbAg4l5. This material has the highest ionic conductivity at room temperature of any known crystalline substance (0.27 S cm ) with an activation energy of 0.07 eV. The electronic conductivity of RbAg4l5 is negligibly small ( 10 S cm ). 

Fig. 11. Crystal ttructure of rubidium di-hydrogen tri-monochloro-acetate, 6-axis projection. (Circles with curved hatching represent chlorine atoms)...

DCE (75-35-4) Forms explosive mixture with air (—18°F/—28°C). Inhibitors such as the monomethyl ether or hydroquinone must be added to prevent polymerization. Readily forms explosive peroxides with air or contaminants (a white deposit may indicate the presence of explodable peroxides). Violent polymerization from heat or on contact with oxidizers, chlorosulfonic acid, nitric acid, or oleum or under the influence of oxygen, sunlight, copper, or aluminum. Violent reaction with alkali metals (lithium, sodium, potassium, rubidium, cesium, and francium). Incompatible with ozone. May cause an explosive reaction with tri-fluorochloroethylene above 356°F/180°C, perchloryl fluoride above 212°F/100°C. May be corrosive or unstable in the presence of steel. 

Metal atoms or ions can be trapped endohedrally the tris-potassium or tris-rubidium derivative is the organic superconductor with the highest critical temperature obtained so far. 

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