Caesium iodide

The calculation of the surface field of ionic solids at distances appropriate to an adsorbed molecule is highly dependent on this distance. No experimental method of measuring this distance has been developed as yet. If an assumed distance is used, a field value for argon adsorbed on caesium iodide is found to be 5.7 X 10 v./cm. [136) and for argon on KCl to be 4.3 X 10 v./cm. 137). As the surface of silica glass is not completely ionic, the above experimental value of the field (7 X 10 v./cm.) is in reasonable agreement with these theoretical figures. 

H. L. Wells and H. L. Wheeler (1892) prepared CteSiUm penta-iodide, Csl6, as a black liquid, which solidified at about 73°, by heating caesium tri-iodide with water, or solid iodine with a soln. of caesium iodide. If a cone, alcoholic soln. of the impure solid be treated with two eq. of iodine, and cooled, triclinic black crystals of the penta-iodide are formed with axial ratios a b c=0 9890 1 042765. H. M. Dawson and E. E. Goodson isolated a compound of sodium penta-iodide, Nal5.2C6H5N02, from a nitrobenzene soln. of iodine and sodium iodide. 

Caesium iodide, Csl.—The iodide is prepared by the action of caesium sulphate on barium iodide. It forms crystals, melting at 621 0° C.,15 and boiling at 1280° C.,16 the vapour-pressure in atmospheres corresponding with the expression17... 

Caesium iodate, CsI03.—The iodate is precipitated by the action of chlorine on a hot concentrated solution of caesium iodide and hydroxide.6 It yields monoclinic crystals, isomorphous with the corresponding salts of rubidium and potassium, and of density 4-831 at 16° C. At 24° C. its solubility is 2-6 grams in 100 grams of water.7... 

A complex iodide having the formula CsI,AuI3 is produced in glistening, black crystals by the interaction of gold dichloride and caesium iodide.1... 

Relative thermodynamic stabilities of crown ether complexes with several cations can also be evaluated by means of Ti competition experiments. (20) Addition of 18C6 to a solution of caesium iodide affects... 

Rybkin and Seredenko employed the Pt(02)IZr02(Ca0) gas membrane oxygen electrode for measurements of oxobasicity in molten potassium chloride at 800 °C and in caesium iodide at 650 °C [247]. The calibration of the electrochemical cell in a KC1 melt allowed them to obtain slope values equal to 0.213 0.006 V when Na202 was used as an oxide-ion donor, and 0.106 0.004 V when K2C03 was used as a Lux base. The former value is approximately equal to 23RT/F, whereas the latter is close to 1.15i 77F. 

It should be noted that iodine evaporation from the strongly acidic solutions was observed by Rybkin and Seredenko in molten caesium iodide at 650 °C (POJ solutions) [63] and by Rybkin and Banik [64] who studied solutions of PO, H2PO4, VO, etc. in molten Nal at 700 °C. 

However, let us return to the solubility data in caesium iodide-melt at 700 °C. It can be seen that the oxide solubilities in this melt are intermediate between those in KCl-NaCl (CsCl-KCl-NaCl) and CsBr-KBr melts. Since for the said iodide-melt the range of oxides suitable for the investigations is too small, compared with other halides, and the range of solubilities is too narrow, some of the correlations considered above have not been analysed for molten Csl. Nevertheless, for chloride, bromide and iodide-melts, linear correlations between pPMe0 and rk 2 can be found, and the corresponding parameters of equation (3.7.16), with their confidence ranges, are presented in Table 3.7.16. 

Yu.F. Rybkin and A.S. Seredenko, Acidity Scale in Molten Potassium Chloride and Caesium Iodide, Ukr. Khim. Zh. 40 (1974) 137-141. 

V.L. Cherginets, T.P. Rebrova and O.V. Demirskaya, On Carbonate Stability in Caesium Iodide Melt, Phys. Chem. Chem. Phys. 3 (2001) 1479-1480. 

I.r. studies have been made at 10 and 310 K of caesium cyanate and of NCO isolated in caesium iodide by employing the alkali-metal halide pressed disc technique. On replacing CsCNO by KCNO, heating for several hours at 673 K was necessary to encourage diffusion away of ions and prevent absorptions due to KCNO appearing with aging. ... 

Caesium iodide Cesium iodide Cesium Iodide (Csl) Cesium monoiodide Dicesium diiodide EINECS 232-145-2 NSC 15199 Tricesium triiodide. Crystals for infrared spectroscopy, scintillation counters, fluorescent screens. Crystals mp = 521°, bp = 1280° d = 4,5 LDsQ (rat ip)" 1.4 g/kg. Atomergic Chemetals Cabot Carbon Ltd Cerac Noah Chem. 

Solubility op Mixtures op Caesium Iodide and Iodine in Water. 

---