Tin tetraphenyl

Fig. 8.17 Upper part structures of 7 and the tin-tetraphenyl-porphyrin (SnP) 8. Lower part schematic representation of the hydrogen bonding motif...

General Method of Preparation of Tin Triphenyl Halides — Tin tetraphenyl (85-4 grams) is dissolved in 700 grams of hot pyridine with mechanical stirring and the solution rapidly cooled in ice, so that a very fine suspension of the compound is produced. At a temperature of —48 C.j 32 grams of bromine in 150 grams of pyridine are added in 6... 

Tin triphenyl chloride.—This has also been obtained by three other methods (1) Tin diphenyl dichloride is treated with sodium amalgam in ether solution, or with ammonia. (2) When an acetic acid solution of tin diphenyl dichloride is treated with sodium nitrite, 85 per cent, of the tin compound is converted to tin, triphcnyl chloride, nitrosobenzene also being formed. (3) It occurs amongst otlier products, when tin tetraphenyl is decomposed by thallic chloride. It crystallises from ether in coloui less crystals, M.pt. lOO"" C, which are partly octahedral and partly prismatic. It boils at 21 0 C. at Uh5 inm., and is soluble in all the usual solvents. 

Tin triphenyl bromide has more recently been ])repared by treating tin tetraphenyl in boiling chloroform with iodine, when tin triphenyl iodide is produced. This is then changed to the hydroxide by 30 per cent, sodium hydroxide, and the solution shaken with concentrated hydrobromic acid. Yield 50 per cent. This method obviates the cooling in solid carbon dioxide adopted by Krause. It crystallises in millimetre-long pyramids or octahedra, and from dilute solution in fern-like masses. It melts at 120-5° C., and boils at 249 C. at 13 5 mm. 

Tin diphenyl dichloride, Sn(C6H5)2Cl2. —Formed (1) By the interaction of tin tetraphenyl (1 mol.) and stannic chloride (1 mol.) in boil-... 

Tin diphenyl dibromide,—Formed by the action of hydrogen bromide on tin diphenyl oxide, the oil solidifying instantly on the addition of a crystal of the chlorobromide. The compound has been more recently prepared by the direct bromination of tin tetraphenyl. It resembles the chlorobromide in properties, and melts at 38° C. Tin diphenyl di-iodide does not appear to be stable, the reaction taking the following course —... 

Carson et al. 20) measured the temperature variation of the vapor pressure of a tin tetraphenyl sample labeled with tritium by a modified Knudsen effusion technique AHy at 25°C = 15.85 kcal/mole. Consequently,... 

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