Perchloric RB

The alkah metal perchlorates are either white or colorless, and have increasing solubiUty in water in the order of Na > Li > NH4 > K> Rb > Cs. The high solubiUty of sodium perchlorate, NaClO, makes this material useful as an intermediate for production of all other perchlorates by double metathesis reactions and controlled crystallization. 

Rb and Cs, which were obtained as dihydrates by similar procedures (Ref 12). Workers at Callery Chem Co also prepd a complex in which M - N02+, mw 506.78, OB to A1203 HC1 +58.4%. It is prepd by a similar procedure as that used for the ammonium salt using nitronium perchlorate, and has similar props (Ref 10) Uses, (see under Perchlorate Explosives and Propellants)... 

Preparation. It is prepd by dissolving Rb carbonate in dil aq perchloric ac, evapg the sotn until ciysts appear, filtering, and drying the ciysts at 120° (Ref 3). Workers in the USSR have reported its large scale prodn by a similar process (Ref 5)... 

During the initial stages (when a < 0.04) of the thermal decompositions of the alkali (Na, K, Rb, Cs) perchlorates [845] (giving MC103), the rates of oxygen evolution from all four salts were approximately the same and independent of particle size and sample mass. Experimental values of E ( 190 kJ mole-1) were low compared with those found by Solymosi [846] for the overall reaction (250—290 kJ mole-1) and also lower than the standard enthalpies for anion breakdown (276—289 kJ mole-1) for... 

Standing Committee of Analysts (DoE) (1979) The Analysis of Agricultural Materials -Cobalt, Nitric-Perchloric Acid Soluble in Soil Method 23, MAFF Technical Bulletin RB 427, HMSO, London, UK. 

Soluble Acetate, nitrate, alkali metal (Na, K, Li, Rb, Cs), ammonium, perchlorate... 

Since few salts are sparingly soluble in water, there are few precipitation reactions of the aqueous ions. Generally the larger the M+ ion, the more numerous are its insoluble salts. Thus sodium has very few the mixed Na—Zn and Na—Mg uranyl acetates [e.g., NaZn(U02)3(CH3C02),-6H20], may be precipitated almost quantitatively under carefully controlled conditions from dilute acetic acid solutions. The perchlorates and hexachloroplatinates of K, Rb, and Cs are rather insoluble in water and virtually insoluble in 90% ethanol. These heavier ions may also be predpitated by the ion [Co(N02)6]3 and various other large anions. Sodium tetra-phenylborate Nal QHs), which is moderately soluble in water, predpitates the tetraphenylborates of K, Rb, and Cs from neutral or faintly acid aqueous solutions. 

Perchlorates of K. Rb, Cs decompose with a very small therniochemical effect, for example with KCIO4 it - A// = 0,6 kcal/mol. 

Figure 4. The activation energy of ferrocenium-ferrocene (Cp2Pe+/°) self-exchange in acetone (e = 20.70) as the function of electrolyte concentration, (a and ) - experimental values for tetraethylammoniym perchlorate and tetraethylammoniym hexafluorophosphate correspondingly [42], (solid and dashed line)-theoretical prediction from the AMS A theory with parameters Rd = Rb. = L = 8 A, Ri = 6 A, and ft, = 8 A, respectively [41],...

The kinetics of the initial stages of the thermal decompositions of the Group lA metal (Na, K, Rb, Cs) perchlorates between 623 and 773 K were studied by Cordes and Smith [3]. The major reaction products were the corresponding chlorates and oxygen. Because the rates of oxygen evolution below 683 K from all four reactants were almost equal, it was suggested that the rate-controlling factor was a property... 

Irradiation of alkaline and alkaline earth metal perchlorates [16] ( Co source at ambient temperature) yielded QOj", CC", OOj", CCOj, Oj and metal oxide as primary products with CIO formed by secondary reactions. The order of decreasing product yields was Cs > Rb > Mg > Sr > Na > Ca > K > Li > Ba. 

As is the case with the perchlorates, the bromine atom in the perbromate series is in a nearly tetrahedral environment and hence the EFG at the bromine will be nearly zero. Therefore, it should be possible to observe Br SSNMR signals in these systems. The cesium member of this series, CsBr04, belongs to the tetragonal Hi/a space group, while the others (M = K, Rb, NH4) belong to the orthorhombic group Pntm. 

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