Rubidium amide

Similarly, the reaction of metallic rubidium with another metal in ammonia led to the appropriate heterobimetallic amides, as in the reaction of Rb with Ca in supercritical ammonia at 573 K yielding RbCa(NH2)3. which consists of one-dimensional infinite face-sharing anion-octahedra occupied by calcium and connected into a three-dimensional network by the rubidium ions (Rb N contacts between 3.11 and 3.92 A). 

Like its sodium and potassium analogues, RbN(SiMe3)2 when reacted with ferrocene forms an infinite array of formula [( RbN(SiMe3)2 2 Fe(ri5-C5H5)2 )oo]. Its structure resembles those of its sodium and potassium counterparts in that the RbN(SiMe3)2 2 

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Alkali metals, especially potassium, rubidium, and cesium Metal amides (e.g., NaNH2)... 

Rubidium nitride, Rb3N, and rubidamide, RbNH2.—The nitride is formed along with the amide by heating the hydride in nitrogen.9 The amide is also produced by the action of ammonia on the metal at 200° to 300° C.,10 as well as at lower temperatures.11 The amide is a white, deliquescent, crystalline substance, melting at 285° to 287° C., and boiling about 400° C. 

Figure 2. kas a function of alkali amide at —59.3°C. sodium O potassium, A rubidium, cesium... 

Precise results of the conductivity of alkali amides have been given by Franklin (8) and Hawes (11) in the case of potassium and by Hawes (11) in the case of sodium. No data are available for rubidium and cesium amide. Measurements have been made on cesium amide and potassium amide. 

The amides of rubidium or cesium have been proven as the best catalysts for the hydroamination of ethylene with ammonia. In liquid ammonia below the critical temperature (132.5 °C) at 100 °C and an initial pressure of only 11 MPa a turnover number (TON) of about 4 mol C2H4/(mol CSNH2) per h could be reached [6]. 

Rubidium, caesium, and mixed potassium/rubidium and rubidium/caesium salts were obtained by treating bis(phosphoryl)amides, (Ar0)2(0)PNHP(0)(0Ar)2, with the appropriate alkali metal carbonates or their mixtures. The caesium salts can also be obtained with caesium hydroxide.58-60... 

The solubility of amides in liquid ammonia differs appreciably and increases from lithium to rubidium. Because of the high reactivity of amides and the excellent solvent properties of liquid ammonia, amide-ammonia solutions are highly reactive and react with most substances.f ... 

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