Strontiums reactions with

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. 

Sugden and Schofield (33) suggest that this reaction (with a rate constant 40-8 cm.3 molecule-1 sec.-1) can account for the boost in ionization of sodium observed when strontium salts are supplied to flames containing sodium. There is evidence (24, 33, 36) which strongly suggests that equilibrium ionization of strontium in flames is rapidly established via... 

There are a number of interferences that can occur in atomic absorption and other flame spectroscopic methods. Anything that decreases the number of neutral atoms in the flame will decrease the absorption signal. Chemical interference is the most commonly encountered example of depression of the absorption signal. Here, the element of interest reacts with an anion in solution or with a gas in the flame to produce a stable compound in the flame. For example, calcium, in the presence of phosphate, will form the stable pyrophosphate molecule. Refractory elements will combine with 0 or OH radicals in the flame to produce stable monoxides and hydroxides. Fortunately, most of these chemical interferences can be avoided by adding an appropriate reagent or by using a hotter flame. The phosphate interferences, for example, can be eliminated by adding 1 % strontium chloride or lanthanum chloride to the solution. The strontium or lanthanum preferentially combines with the phosphate to prevent its reaction with the calcium. Or, EDTA can be added to complex the calcium and prevent its combination with the phosphate. 

Strontium reacts with water according to the above reaction. What volume of hydrogen gas, at standard temperature and pressure, is produced from 0.100 mol of strontium ... 

Proton conduction at high temperatures occurs in certain perovskites such as doped strontium cerate, Sr Ceo.95Ybo.o503 t. In air, this material is primarily an electronic conductor due to the mixed valence of Ce. In the presence of moisture, water is absorbed by the reaction with positive holes to generate protons ... 

Calcium reacts with phosphine in an analogous manner as the alkali metals. In liquid ammonia, solid Ca(PH2)2 nNHs is formed with hydrogen evolution 128,280) -pjjg corresponding reaction with a solution of elemental strontium in liquid ammonia does not lead to a uniform product. ... 

It has been observed in CVD as well as in ALD depositions that coordi-natively unsaturated y0-diketonate-type compounds may oligomerise or react with the environment and become less volatile [15,16,66,67]. This is a cause of instability, especially with larger and basic central ions such as strontium and barium. y0-diketonate-type chelates can be protected against oligomerisation and roomOtemperature reactions with moisture by adducting them with neutral molecules (Fig. 4) [68-71]. 

Strontium sulfide. SrS. [CAS 1314-96-1], grayish-white solid (thermodynamic Ksp 500) reactive with water to form strontinm hydrosulfide, Sr(SH)2, solution. Strontium hydrosulfide is formed (1) by reaction of strontium sulfide and H2O, (2) by saturation of strontium hydroxide solution with H2S, Strontium polysulfides are fonued by boiling strontium hydrosulfide with sulfur,... 

Other examples of this series include a selection of ate complexes prepared by the treatment of alkylzinc reagents with freshly distilled alkaline earth metals under extrusion of elemental zinc. This route was employed to prepare a strontium zincate in which the alkaline earth metal center adopts a distorted octahedral geometry completed by two THF solvent donors. Similar reactions with barium metal lead to structurally closely related compounds. Flexibility in solvent choice is noted by the preparation of related complexes in toluene, displaying metal-toluene itt-interactions. 

Calcium, strontium, and barium react vigorously at 25°C. The less easily oxidized beryllium and magnesium show no observable reaction with water at 25°C, although magnesium reacts with boiling water. Table 18.7 summarizes various properties, sources, and preparations of the alkaline earth metals. 

Vigorous exothermic reaction with benzene + Raney nickel catalyst metals (e.g., lithium calcium barium strontium sodium potassium above 300°C) palladium(II) oxide palladium trifluoride l,l,l-tris(hydroxymethyl)nitromethane + nickel catalyst. 

Several reports have appeared of the application of unusual organometallic reagents in phosphine synthesis. Treatment of 2-lithiopyridine with anhydrous zinc chloride results in the formation of a 2-pyridylzinc reagent which can be used to introduce the 2-pyridyl group at phosphorus in a controlled manner. Thus, e.g., in its reaction with phenyldichlorophosphine, the 2-pyridyl-(phenyl)chlorophosphine (15) is formed. This has then been converted via the phosphide route into a new class of binucleating ligands (16). The sterically crowded dichlorophosphine (17) (accessible from the reaction of phosphorus trichloride with lithium diphenyl(2-pyridyl)methanide) is converted into the thermally stable phosphirane (18) on treatment with calcium, strontium or barium cyclooctatetraenide.The reaction of phenyldichlorophosphine with the readily accessible titanacycle (19) affords a convenient route to the phosphetene (20). ... 

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