Thallium 1 fluoride

Goswami and Sarkar3 claimed to have prepared methyl and ethyl fluoroformates by the action of thallium fluoride on the corresponding chloroformates. These fluoroformates were described as powerful lacrimators. We found that no appreciable reaction took place between potassium fluoride and ethyl chloroformate in boiling carbon tetrachloride or nitrobenzene. Ethyl fluoroformate could, however, be readily produced by the action of potassium fluoride on ethyl chloroformate by using the autoclave technique. It was found not to have the lacrimatory properties claimed for it, and was non-toxic in comparison with M.F.A. This non-toxicity was to be expected, as the fluoroformate contains the COF and not the CH2F- group. 

Thallium fluoride is prepared by reacting thallium carbonate with hydrofluoric acid. Also, the compound can be made by reacting thaUium metal with fluorine. 

Thallium Tantalum Fluoride, 2TlF.TaF5 or TlaTaF7, is obtained in glistening crystals by the action of thallium fluoride on tantalum pentoxide in hydrofluoric acid.1... 

Ketones. Fluoro ketones have been obtained from fluoro acetoace-tates and sulfuric acid.86 Examples are CF3COCH3 and CHF2COCH3. They have also been obtained by halogen interchange, such as CH2FCOCH3 from CH2ICOCH3 and thallium fluoride.96... 

The fluorination ofacid chlorides with other reagents, e. g. arsenic fluoride, zinc fluoride, 17-219 and antimony fluoride, has been reported. Zinc fluoride reacts under mild conditions giving the desired acyl fluorides in good yield, while antimony(III) fluoride gives aromatic acyl fluorides in good yield, e. g. 2, but aliphatic systems in only moderate yield, e. g. 3.Other reagents w hich are used include mercury(II) fluoride, thallium fluoride, " alkali metal fluorosulfinates " and sulfur tetrafluoride. ... 

Methyl fluoroformate, obtained by the action of thallium fluoride on methyl chloroformate, is a liquid boiling at 40° C. Density i-o6 at 33° C. 

Fluoride, chloride, bromide, and iodide derivatives of thallium(I) are well known. Their solubilities and photosensitivity are similar to the corresponding silver(I) systems. TIE is water-soluble, whereas the chlorides, bromides, and iodides are water-insoluble solids. This property is exploited in ligand-transfer chemistry involving thallium precursors. Some solid-state structures of thal-lium(I) salts of weakly coordinated anions show TT -halide interactions. Selective abstraction of a fluoride from a C-F bond, leading to thallium fluoride, has been described. The compound [ P(CH2CH2PPh2)3 RuH( 7 -ClTl)]PF6 represents the first metal complex containing an 77 -Cl-bonded TlCl ligand. This compound act as a thallium(I)-ion carrier. 

Fluoroformic esters are obtained either from the corresponding chloroformates and thallium fluoride by halogen exchange859 or, if the expensive T1F is not available, from carbonyl bromide fluoride and alcohols which give only... 

Main and subgroup elements of the earlier rows often exhibit a dynamic equilibrium between different coordination numbers. Elements such as fluorine, chlorine, oxygen, etc., can donate one or two free electron pairs to vacant lower energy orbitals of these metal atoms. Fluorine can therefore act as a bifunctional bridging atom, and oxygen can even be mono- to tetrafunctional, according to its bond partner. In all these cases the coordination number is increased above normal. In the case of fluorine, fluorine bridge bonds exist, for example, in the anion of the complex between thallium fluoride and aluminum fluoride ... 

Cho, D., Sangster, K., and Hinds, EA., Tenfold improvement of limits on T violation in thallium fluoride, Phys. Rev. Lett., 63, 2559, 1989 Cho, D., Sangster, K., and Hinds, E.A., Search for time-reversal-symmetry violation in thallium fluoride using a jet source, Phys. Rev. A, 44, 2783,1991. 

Jr., T. Saue. Ab initio Dirac-Hartree-Fock calculations of chemical properties and PT-odd effects in thallium fluoride. Phys. Rev. A, 57(2) (1998) 920-944. 

Thallium iodide pKsp 112 EMF 218, 219 Thallium fluoride EMF 198-203 Thallium methoxlde SI 105... 

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