Thallium I iodide

Thallium I) iodide. Til yellow or red solid precipitated from aqueous solution. 

Thallo-. thallous, thalhum(I). -bromid, a, thallous bromide, thalliuro(I) bromide -chlorat, n. thallous chlorate, thallium(I) chlorate, -chlorid, n. thallous chloride, thallium I) chloride, -fluorid, n. thallous fiuoride. thal lium(I) fiuoride. -ion, n- thallous ion, thal lium(I) ion. -jodat, n. thallous iodate. thal liura(I) iodate. -jodid, n. thallous iodide. thallium(I) iodide, -salz, n. thallous salt. thallium(I) salt, -sulfat, n. thallous aulfate. thailium(I) sulfate, -verbindung, /. thallous compound, thallium(I) compound. 

A. trans-l,2-Cyclohexanediol. In a 100-ml., round-bottomed flask equipped with a reflux condenser protected with a drying tube are placed a magnetic stirring bar, 17.56 g. (0.0667 mole) of thallium (I) acetate (Note 1), and 40 ml. of dried acetic acid (Note 2). The mixture is stirred and heated at reflux for 1 hour. To the cooled mixture are added 2.84 g. (3.5 ml., 0.0346 mole) of cyclohexene (Note 3) and 8.46 g. (0.0333 mole) of iodine (Note 4). The resulting suspension is stirred and heated at reflux for 9 hours (Note 5), and then cooled to room temperature. The yellow precipitate of thallium(I) iodide is filtered and washed thoroughly with ethyl ether. The filtrates are comhined, the solvents are removed under reduced pressure with a rotary evaporator (Note 6), and the residual liquid is dissolved in dry ethyl ether. The turbid solution is dried with anhydrous potassium carbonate, and the solvent is again removed by rotary evaporation (Note 6), affording 5.4-6.3 g. of trans-1,2-cyclohexanediol diacetate as a mobile, brown liquid (Note 7). 

However, the most convenient method of preparation is from the reaction of thallium (I) iodide and oiganolithium ... 

The active ingredient in some rat poisons is thallium(I) sulfate, T12S04. A chemist takes a 500 mg sample of thallium(I) sulfate and adds potassium iodide, to precipitate yellow thallium(I) iodide. When the precipitate is dried, its mass is 200 mg. What is the mass percent of T12S04 in the rat poison ... 

Potassium iodide solution yellow precipitate of thallium(I) iodide, Til, almost insoluble in water it is also insoluble in cold sodium thiosulphate solution (difference and method of separation from lead). 

Potassium iodide solution brownish-black precipitate, probably a mixture of thallium(I) iodide and iodine. 

The qualitative detection of thallium is easily achieved by emission spectroscopy, thallium giving a green flame color. Thallium(I) iodide is a yellow precipitate that is insoluble in water, nonoxidizing acids, ammonia, and potassium cyanide, but that can be dissolved in sodium thiosulfate. Traces of thallium can be detected by dyes such as Brilliant Blue or Rhodamine B. Tl (or Tl after reduction by SO2) can be determined by BrOs" or titrant. A gravimetric method uses Tl chromate. ... 

Thallium(I) halides, TlX, are stable compounds which in some ways resemble Ag(I) halides. Thallium(I) fluoride is very soluble in water, but TlCl, TlBr and Til are sparingly soluble the trend in solubilities can be traced to increased covalent contributions in the ionic lattices for the larger halides, a situation that parallels the trend for the Ag(I) halides (see Section 5.15). In the solid state, TIF has a distorted NaCl lattice, while TlCl and TlBr adopt CsCl structures. Thallium(I) iodide is dimorphic below 443 K, the yellow form adopts a lattice derived from an NaCl structure in which neighbouring layers are slipped with respect to each other and, above 443 K, the red form crystallizes with a CsCl lattice. Under high pressures, TlCl, TlBr and TU become metallic in character. 

Far-i.r. and Raman spectra of orthorhombic and cubic phases of thallium(i) iodide have been obtained in the range 4—570 K, and assigned in terms of the optical modes of these systems. ... 

The thallium (present as TI2SO4) in a 9.486-g pesticide sample was precipitated as thallium(I) iodide. Calculate the mass percent of TI2SO4 in the sample if 0.1824 g of Til was recovered. 

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