Strontium halides

Strontium Halides. Strontium haUdes are made by the reactions of strontium carbonate with the appropriate mineral acids. They are used primarily in medicines as replacements for other bromides and iodides. 

Strontium compounds, 23 319-324 estimated distribution of, 23 3201 world production of, 23 319-320 Strontium cyanide, 8 197 Strontium ferrate (1 1), 5 598 Strontium fluoride, 23 323 Strontium fluoroborate tetrahydrate, 4 153 Strontium halides, 23 323 Strontium hexaferrite, 23 323 Strontium hydride, 13 613 Strontium hydroxide, 23 324 Strontium iodide, 23 323 Strontium-lead alloys, 14 779 Strontium minerals, 23 320 producers of, 23 319 Strontium nitrate, 23 319, 321, 323 Strontium oxide, 23 318, 324 Strontium peroxide, 18 396, 23 324 Strontium-silicon alloy, 22 520 Strontium sulfate, 23 322, 324 Strontium sulfide, 23 322 Strontium titanate... 

Ammino-derivatives of Salts oe Subgroup A—Derivatives of Calcium Halides, Strontium Halides, and Barium Halides. 

It is obvious from the foregoing discussion that the enthalpies of mixing for charge-unsymmetrical systems do not follow the simple conformal solution theory. When the anion in a strontium halide-alkali metal halide mixture from chloride to bromide and from bromide to iodide is changed, the enthalpy of mixing is decreasing. For all systems, the enthalpy interaction parameter, k, is a linear function of 512 with the usual exception for lithium-containing systems. Two important features of the k versus 512 plot should be emphasized ... 

A 0.652-g sample of a pure strontium halide reacts with excess sulfuric acid, and the solid strontium sulfate formed is separated, dried, and found to weigh 0.755 g. What is the formula of the original halide ... 

Because of the great potential selectivity of solids, GSC is especially desirable for the separation of isomers and high-molecular-weight compounds which are thermally stable. These properties of GSC prompted research into the use of barium and strontium halides (chloride, bromide, and iodide) as adsorbent supports for GSC (all columns were made of glass 6 ft x 0.25 in. o.d.) (23). Conclusions from this study showed the following ... 

Goldschmidt predicted from his empirical rule that calcium chloride would not have the fluorite structure, and he states that on investigation he has actually found it not to crystallize in the cubic system. Our theoretical deduction of the transition radius ratio allows us to predict that of the halides of magnesium, calcium, strontium and barium only calcium fluoride, strontium fluoride and chloride, and barium fluoride, chloride,... 

Strontium also is a reducing agent. It reduces oxides and halides of metals at elevated temperatures to metallic form. 

The halides of strontium resemble those of calcium, and unite with ammonia gas in the dry state. All are decomposed by water with liberation of ammonia. The chloride, on exposure to ammonia gas, yields octammino-strontium chloride, [Sr(NII3)8]Cl2. It is a voluminous white powder which loses ammonia on heating, leaving a residue of strontium chloride. If degraded isothermally, constancy of pressure indicates the existence of monammino-strontium chloride, [Sr(NH3)]Cl2, which on further heating loses ammonia completely. The monammine at a temperature of 45-5° C. has a dissociation pressure of 100 mm.4... 

The sodium chloride structure is adopted by most of the alkali metal halides All of the lithium, sodium, potassium, and rubidium halides plus cesium fluoride It is also found in the oxides of magnesium, calcium, strontium, barium, and cadmium... 

All metallic chlorides, except silver chloride and mercurous chloride, are soluble in H.O. but lead chloride, cuprous chloride and thallium chloride are only slightly soluble. Metallic chlorides when heated melt, and volaiilize or decompose, e.g.. sodium chloride, mp 804 (2 calcium, strontium, barium chloride volatilize at red heal magnesium chloride crystals yield magnesium oxide residue and hydrogen chloride cupric chloride yields cuprous chloride and chlorine. Sec also Chlorine Chlorinated Organics. Halides Hypochlorites and Sodium Chloride. 

The synthesis of the title compositions has been selected as representative of compounds that can readily be prepared by the flux-reaction technique. In this technique, a halide melt serves both as a flux and as a constituent component of the basic reaction. The procedure has been described in the literature1 and has served for the preparation of a variety of ternary oxides, usually in the form of small, well-defined, single crystals. The halide phosphates and vanadates of strontium represent the apatite and spodiosite structures, both interesting compositions from a biochemical and solid-state point of view. 

Heterocyclic mono(ring) complexes, calcium, strontium, barium metal halides, 2, 116... 

Barbier-type C-alkylation of imines can be carried out with alkylstrontium halides generated from strontium metal and alkyl halide.38 IV-Alkylation competes, and RSrI is strongly nucleophilic, as shown by a-alkylation of imines derived from enolizable... 

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