Tetrammineplatinum

Characteristics of established platinum plating baths have recently been reviewed . Advantages have been claimed for new baths based on the complex tetrammineplatinum(ii) cation. ... 

Cyanometallates, syntheses 62, 67, 72, 73, 78 Hexamminecobalt(III) salts, synthesis 69 Cobalt nitrosyl tricarbonyl, S3mthesis 76 Tetrammineplatinum(II) chloride, synthesis 80... 

Tetrammineplatinum(II) chloride may be prepared by heating any one of the following with excess aqueous ammonia until a colorless solution results platinum(II) chloride tetrammineplatinum(II) tetrachloroplatinate(II) (Magnus s green salt), [Pt(NH3)4][PtCl4] diamminedi-chloroplatinum, [Pt(NH3)2Cl2] or a solution of tetra-chloroplatinic(II) acid. The present method involves the preparation of pure tetrammineplatinum(II) tetrachloro-platinate(II) and its subsequent reaction with aqueous ammonia. 

When the green precipitate has completely dissolved, the resulting solution of tetrammineplatinum(II) chloride is concentrated on the steam bath until only a faint odor of ammonia is present. The volume is adjusted to about 50 ml. and the solution filtered. The filtrate is made just acid to litmus with dilute hydrochloric acid, 1 ml. of concentrated hydrochloric acid added in excess, and the tetrammineplatinum(II) chloride precipitated immediately with 10 volumes of a solution of equal parts of alcohol and acetone. After about 1 hour, the supernatant liquid is decanted through a suction filter and the white precipitate washed by decantation with three 50-ml. portions of the alcohol-acetone solution, transferred to the filter with the same solution, washed with acetone alone, and finally washed thoroughly with ether and dried in the air. 

Tetrammineplatinum(II) chloride dissolves in four to five parts of water at room temperature, and the solubility... 

In an aqueous medium the di-ti-amido-bis[tetrammineplatinum(IV)] complex. A, is readily deprotonated. Scheme 2.3. 

---