Thallium complexes hydrogen

Fo 6oK2N4PtC4Ho w 3H20, Platinate, tetiacyano-, potassium (hydrogen difiuoride)-(1 2 0.30), 21 147 FjGiHj, Benzene, 1,3,5-trifluoro, thallium complex, 21 73... 

Selectivity of propylene oxide from propylene has been reported as high as 97% (222). Use of a gas cathode where oxygen is the gas, reduces required voltage and eliminates the formation of hydrogen (223). Addition of carbonate and bicarbonate salts to the electrolyte enhances ceU performance and product selectivity (224). Reference 225 shows that use of alternating current results in reduced current efficiencies, especiaHy as the frequency is increased. Electrochemical epoxidation of propylene is also accompHshed by using anolyte-containing silver—pyridine complexes (226) or thallium acetate complexes (227,228). 

During oxidation of tin(II) ions by hydrogen peroxide, iodine, bromine, mercury(ir) and thallium(III) the induced reduction of cobalt(in) complexes cannot be observed. Therefore, it was concluded that these reactions proceed by 2-equivalent changes in the oxidation states of the reactants. 

A series of unsymmetric bis(pyrazolylate) ligands have been synthesized and complexed with zinc via metathesis of a thallium derivative, (17) and (18). This allowed the synthesis and complexation of NNS and NNO pyrazolylborate derivatives.1 9,160 Parkin and co-workers synthesized zinc complexes of a series of unsymmetric pyrazole-containing ligands.161-163 The asymmetric bis(pyrazolyl)hydroborato zinc complex has been structurally characterized,164 and will also be discussed in the context of its interaction with the B H hydrogen in Section 6.8.9.2. 

The salts of the enneahydridorhenate anion are remarkably stable (up to 300°C). They are soluble in alkaline solutions which are stable in the absence of oxygen. Aqueous solutions are alkaline and on the addition of acid liberate hydrogen, and rhenium metal is deposited (178). The aqueous solutions have strong reducing properties (238) and cause the immediate reduction of complexes such as [Cu(NH3)4]2+, [Ag(NH3)2]+, and [Bi(OH)4] to the respective metals. Treatment with thallous ions gives initially a white precipitate that rapidly turns black, giving thallium metal. This reaction may be used as a test for the ReH92 anion. 

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