Preparation of ammines

Preparation of ammines. Most ammines can be prepd by passing NH3 gas into a coned soln of a metal salt, such as chlorate, iodate, perchlorate, etc, as for instance ... 

Solvates are perhaps less prevalent in compounds prepared from liquid ammonia solutions than are hydrates precipitated from aqueous systems, but large numbers of ammines are known, and their study formed the basis of Werner s theory of coordination compounds (1891-5). Frequently, however, solvolysis (ammonolysis) occurs (cf. hydrolysis). Examples are ... 

The preparation of catalyst Ir-8 was analogous to that of Pd-15, but for the use of the Ir ammine complex instead of palladium. 

Unexpected uniformities observed in the impact-sensitivities of a group of 22 amminecobalt oxosalts are related to kinetic factors during the initiation process [6], A series of ammine derivatives of cadmium, cobalt, copper, mercury, nickel, platinum and zinc with (mainly) iodate anions was prepared and evaluated as explosives [7], Earlier, ammine and hydrazine derivatives of cadmium, cobalt, copper and nickel with chlorate or perchlorate anions had been evaluated as detonators. Dihydrazinecopper(II) chlorate had exploded when dried at ambient temperature [8],... 

In 1892 Jorgensen 1 discovered a series of polynuclear chromic ammines which he obtained as by-products in the preparation of luteo-chromic salts. These he called Rhodoso-chromic salts. Later, in 1901, Pfeiffer 2 prepared by the same method rhodoso-chromic salts containing ethylenediamine in place of ammonia. The constitution of the rhodoso-salts is, however, still somewhat doubtful. Jorgensen gave to the compounds the constitutional formula... 

Preparation of Boron Trifluoride Ammine. Assemble an apparatus as shown in Pig. 113. Place flask 1 into a bath with ice. To produce ammonia, spill solid granulated sodium or potassium hydroxide into bottle 2. Pour a concentrated ammonia solution into the dropping funnel. 

Until recently, molybdenum(III) ammine complexes have been conspicuous, owing to their scarcity. Previously, the preparation of molybdenum(III)... 

Examples of the preparations of ris-[Cr(CN)2(en)2]2+ salts, mono- and di-ammine- and fluoro-bis(ethylenediamine) salts are given in Schemes 39 to 46. 

Preparation of the desired copper ammine complex by metathesis in solution and addition of an organic precipitating solvent. 

The statements made regarding solubility and preparation of copper complexes (see No. 89) apply also to the formation of zinc ammines. 

The procedures described should serve as a general guide to the preparation of nickel ammine complexes. 

The brown rhombic prisms were shown by F. M. Jager to have the axial ratios a b c=0-8837 1 0-5226 and a sp. gr. 1-933 at 15°. The salt develops ammonia when treated with potassium hydroxide. This salt can be used as a starting point for the preparation of some other ammines. According to S. M. Jorgensen, with ammonia, it forms the cobaltic dinitritotetrammine tetranitritodiamminocobaltiate. 0. L. Erdmann prepared potassium tetranitritodiamminocobaltiate, K[Co(NH3)2(N02)], by adding potassium nitrite to a soln. of cobaltous and... 

Cationic Complexes. One series of ammine complexes has been found for osmium ([Os2N(NH3)8V2]3+) and two for ruthenium ([Ru2N (NH3) 8-X2]3+ and [Ru2N(NH3)6(H20)X3]2+). The preparative methods are indicated in Table IV. 

Direct methods for making the complex starting with cobalt(II) chloride involve preparation of a carbonatotetra-ammine salt by air oxidation and subsequent reaction with ammonia and hydrochloric acid. The procedure is time-consuming but gives excellent yields. A more rapid and simpler synthesis, which utihzes the reaction of hydrogen... 

The hexachloroplatinates are among the best known and most useful platinum compounds. The insoluble ammonium salt, which readily yields platinum on ignition, is important in the refining, recovery, and analysis of platinum and is the reactant for the preparation of a great number of ammine complexes. 

Until recently ammine complexes of osmium have been little studied compared with their ruthenium analogs. This appears to have been caused by the lack of suitable synthetic routes to them. The discovery of pentaammine(dini-trogen)osmium (II) opened convenient routes to pentaammines of osmium (III), and a convenient synthesis of hexaammineosmium(IIl)2 gave new routes to the previously unknown nitrosyls of osmium(II). Here are given the synthesis of [Os(NH3)s(N2)]l2 and its conversion to [Os(NH3)5l]l2 the synthesis of [Os(NH3)6]l3 and its conversion to [Os(NH3)5(NO)]X3 H20(X = Cl, Br, I) and the preparation of [OsX(NH3)4(NO)]2+(X = OH, Cl, Br, I) from [Os(NH3)5(NO)]3+. 

The preparation of substituted pentacyanoferrate(II) ion complexes involves a series of ligand exchange reactions at the iron(II) metal center. Equations (4.1)-(4.3) outline the synthesis of amino acid (AA) metal complexes in aqueous solution. Starting from sodium nitroprusside ion, [Fe(CN)5(NO)]2, equation (4.1), the nitrosyl ligand, NO+, is replaced by an ammine moiety, NH3. The aquapentacyanoferrate(II) ion, [Fe(CN)5(H20)]3, is then generated in situ, equation (4.2), followed by reaction with an AA to yield the desired [Fe(CN)5(AA)](3+n) complex, equation (4.3). 

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