Lead tetrachloride

Lead tetramethyl and lead tetraethyl are covalent lipophilic liquids of low water solubility. Certain inorganic forms of lead, for example, lead tetrachloride, have similar properties, but other forms such as lead nitrate and lead dichloride are ionic and water soluble. Covalent and lipophilic forms of lead, like lipophilic forms of organomercury and organotin, can readily cross membranous barriers such as the... 

Lead chloride, 4112 Lead(II) fluoride, 4329 Lead tetrachloride, 4172 Magnesium chloride, 4081 Manganese(II) chloride, 4085... 

Lead tetrachloride may be prepared by dissolving lead dioxide in cold concentrated hydrochloric acid at 0°C ... 

The preferred preparation method is to introduce chlorine into the solution while dissolving lead dioxide in cold concentrated HCl. This prevents decomposition of PbCL to PbCb and enhances the formation of chloroplumbic acid, H2PbCl6 in solution. Addition of ammonium chloride precipitates out yellow ammonium chloroplumbate, (NH4)2PbCl6, which is filtered out. The yellow precipitate, on treatment with cold concentrated sulfuric acid, forms lead tetrachloride, which separates out as a yellow oily liquid. The reactions are ... 

Lead tetrachloride decomposes at 20°C, forming lead dichloride and evolving chlorine ... 

Ammino-lead Tetrachlorides.—Lead tetrachloride absorbs ammonia more readily than does the dichloride. If dry ammonia gas is passed into a suspension of anhydrous lead tetrachloride in chloroform, tetrammino-lead tetrachloride, [Pb(NH3)t]Cl4, or diammino-lead tetrachloride, [Pb(NH3)2]Cl4, is produced, according to the concentration of the solution. The former crystallises in orange-yellow needles and the latter separates as a white powder. Both compounds are stable in air.6... 

Lead tetrachloride forms additive compounds with the bases pyridine and aniline, as, for example, dipyridino-lead tetrachloride, [Pb(CsHsN)2]Cl4, and trianilino-lead tetrachloride, [Pb (C e IS NH 2) 3] Cl 4. These compounds are prepared by adding the base to solutions of the chloride in chloroform. They decompose in moist air and on heating. Two pyridino-derivatives of lead dichloride are known a compound of composition 8PbCl2.4(C5H5N), which crystallises in colourless needles,5 and dipyridino-lead dichloride, which corresponds to the diammine. Dipyridino-lead dichloride, [Pb(CsH5N)2]Cl2, crystallises in colourless needles and readily loses pyridine on exposure to air.8... 

Preparation of Lead Tetrachloride. Thoroughly mix 1 g of ammonium hexachloroplumbate with 3 g of concentrated sulphuric acid cooled to 0 °C. Separate the heavy drops of oily liquid formed from the reaction mixture. What are these oily drops Write the equations of the reactions. 

Lead Tetrachloride, 2CH 3.C6H4.N2C + PfcCl4 yel crysts, mp - explodes at 78-80° stable if kept dry and in absence of air was prepd by treating the chloride salt with lead tetrachloride... 

Lead Tetrachloride, 2CH3.CgH4.N2.Cl + PbCl4 yel crysts, explodes at 72-75° insol in w org solvs... 

CAUTION Lead tetrachloride decomposes with explosive violence when strongly heated. Quantities larger than that given here should not be made, and the compound should be used as soon as possible after it is prepared. Protective clothing should be worn.]... 

In (a) the yellow soluble substance is lead tetrachloride PbCU and is formed by the reaction... 

Lead tetrachloride is very unstable and decomposes rapidly into the lower chloride PbCl2 and free chlorine. This chloride of lead is the same one that is obtained when lead monoxide is treated with hydrochloric acid ... 

Precipitate a little lead chloride by adding hydrochloric acid to a solution of lead nitrate. Describe its properties and compare them with those of lead tetrachloride (reference books). To what oxide of lead does lead tetrachloride correspond ... 

The yellow solution contains lead tetrachloride. It is puzzling to explain why lead dioxide will not react with two of the strong acids tried, yet does react with hydrochloric acid to give what is apparently a salt, PbCl4. The explanation lies in the character of lead tetrachloride, which is practically un-ionized, and therefore is hardly to be classed as a salt. In the anhydrous condition it is a liquid like carbon tetrachloride. Furthermore it combines with excess HC1 to form the complex acid H2PbCl6, of which the ammonium salt (NH4)2PbCl6 can be crystallized. By comparison, if nitric acid reacted with lead dioxide, the tetranitrate, Pb (NO3)4, would be the product this presumably would be highly ionized like all nitrates, which means that it would have to hydrolyze completely. 

With a large amount of water the lead tetrachloride hydrolyzes... 

The body shows decomposition if heated above 270° C. and burns in air with a reddish flame and the separation of lead oxide. It is moderately soluble in chloroform, benzene, or carbon bisulphide when hot, and difficultly soluble in alcohol, ether, ligroin, or acetic acid. If heated in a sealed tube with hydrochloric acid decomposition occurs, lead tetrachloride and benzene being produced. By the action of halogens or concentrated nitric acid two phenyl groups are split off, and a lead diphenyl dihalide or dinitrate formed. A similar action takes place with iodic acid, formic, acetic, trichloracetic, propionic, valeric, and p-nitrobenzoic acids. With metallic chlorides the following derivatives are formed arsenic trichloride — lead diphenyl dichloride and diphenyl arsenious chloride antimony trichloride — lead diphenyl dichloride and diphenylstibine chloride antimony penta-chloride — lead diphenyl dichloride and diphenylstibine trichloride bismuth tribromide —> lead diphenyl dichloride and diphenylchloro-bismuthine thallie chloride —> lead diphenyl dichloride and thallium diphenyl chloride tellurium tetrachloride —> lead diphenyl dichloride and tellurium diphenyl dichloride. 

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