Cyanoplatinate

Baryum, n. barium, -chlorhydrat, n. barium chloride. -hydrat, n. barium hydroxide, -hyperoxyd, n. barium peroxide, barium dioxide. -jodid, n. barium iodide, -lack, m. barium lake, -oxydhydrat, n. barium hydroxide. -platincyaniir, n. barium cyano-platinite, barium cyanoplatinate(II). -rho-danid, n. barium thiocyanate, -salz, n. bar ium salt. 

Kalium-oxyd, n. potassium oxide, -oxydhydrat, n. potassium hydroxide, -permangaoat, n. potassium permanganate, -platinchlorid, n. potassium chloroplatinate, potassium chlo-roplatinate(IV). -platmchloriir, n. potassium chloroplatinite, potassium chloroplatinate (II). -platmcyaniir, n. potassium cyano-platinite, potassium cyanoplatinate(II). 

Platini-, platinic, platini-, platinum (IV). -chlorid, n. platinic chloride, platinum (IV) chloride, -chlorwasserstoff, m., -chlorwasserstoffsaure, /. chloroplatinic acid, chloroplatinic (IV) acid, -cyanwasserstoffsaure, /. cyanoplatinic acid, cyanoplatinic(IV) acid, platinicyanic acid. 

Gliemann, G., Yersin, H. Spectroscopic Properties of the Quasi One-Dimensional Tetra-cyanoplatinate(II) Compounds. Vol. 62, pp. 87-153. 

Strontium cyanoplatinate when exposed to x-rays exhibits photochromism and a greatly enhanced photoelectric effect (148). However, the exact relationship of this effect to the energy states involved has not been elucidated. This statement also applies to a number of organic photochromes which have been investigated, such as certain hydrazones (169), and aldehyde-amines (164). 

Cyanoplatinous Acid, HaPt(CN)4, maybe prepared by decomposition of its mercuric5 or cupric 8 salt suspended in water by a current of hydrogen sulphide. On filtration and evaporation bluish black prisms are obtained, which deliquesce on exposure to moist air. The salt is easily soluble in water, alcohol and ether. At 100° C. it decomposes into platinous cyanide and hydrogen cyanide. Sulphuric acid converts it into platinous cyanide. The aqueous solution reacts strongly acid, decomposes carbonates, and has an acid taste. The alcoholic solution deposits a mirror of platinum on the containing vessel when heated. 

When a solution of barium platinocyanide is allowed to crystallise after adding a trace of barium cyanide or barium hydroxide to it, crystals of the green 8-salt axe obtained. If, on the other hand, a trace of hydrogen cyanide, hydrogen chloride, tartaric or acetic acid, or cyanoplatinous acid is present instead, crystals of the yellow a-salt are deposited. 

Platinum Tricyanide, Pt(CN)3, is obtained in a more or less pure condition as a yellow powder on heating cyanoplatinic acid to 120° C.4... 

Sulphur dioxide reduces the acid solution to cyanoplatinous acid. Heated to 120° C. the solid green acid is converted into a light yellow residue consisting mainly of platinum tricyanide, Pt(CN)3. 

Good agreement also is found for BaCP. The linear compressibilities of several tetra-cyanoplatinates calculated from the pressure dependence of the E c emission energies are summarized in Table 10 and compared with data from X-ray investigations. 

Monlien et al. studied the cyanide exchange on a square planar tetra-cyanoplatinate complex under high pressure and over a large pH range. 

Metal-chain complexes containing stacked square-planar tetracyanoplatinate groups, [Pt(CN)4]2", are currently of high interest because of their one-dimensional (very anisotropic ) metallic properties. Complexes of this type contain metal-atom chains and often possess a characteristic brilliant, metallic luster. They may be synthesized by oxidation using chemical or electrolytic techniques.1 Although these compounds often appear metallic, they may also be semiconductors. These complexes differ in their Pt-Pt intrachain separations, degree of partial oxidation of the platinum atom (Pt2-1 2 4), electrical conductivity, and metallic color.2 Compounds in this series which contain platinum atoms in a nonintegral oxidation state are known as partially oxidized tetra-cyanoplatinate (POTCP) complexes. Some complexes also possess a metallic luster but are not metallic, as is the case for Tl4(C03)[Pt(CN)4] (see below). 

Barium Platinous Cyanide, Barium terracyano-platinateOl) barium cyanoplatinate(II) barium platinocya-nide platinous barium cyanide. C4BaN4Pt mol wt 436.66. C 11.00%, Ba 31.46%, N 12.83%. Pt 44.71%. BaPt(CN)4. 

Potassium Tetracyanoplatinate (II) and Barium Tetra-cyanoplatinate (II) KsPt(CN)4 3 HsO, BaPt(CN)4 ... 

Potassium tetracyanopalladate(II) when crystallized from water forms the 3-hydrate, which is a white crystalline salt, isomorphous with the corresponding rhombic tetra-cyanoplatinate(II). The 3-hydrate is efflorescent in air it loses two molecules of water of crystallization at 100° and the thii d at 200°. When the compound is heated to moderately high temperatm-es, it decomposes with the formation of palladium, cyanogen, and potassium cyanide. The 1-hydrate is readily soluble in water and in liquid ammonia and is somewhat soluble in alcohol giving colorless solutions in each case. The addition of dilute acids to potassium tetracyanopalladate(II) precipitates pal-ladium(II) cyanide, while boiling with concentrated sulfuric acid completely decomposes the compound. 

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