Solutions, aqueous halogeno complexes

Two 67Zn (natural abundance = 4.12% / = f) n.m.r. studies have been reported.9,10 The chemical shift of 67Zn (4.81 MHz at 1.807 Tesla) in aqueous zinc chloride, bromide, and iodide solutions was found to be strongly concentration dependent, while no such dependence was noted in solutions of the perchlorate, nitrate, or sulphate. This behaviour resembles that found for analogous cadmium systems, and is attributed to the formation of mono- and poly-halogeno- complexes even at low salt concentrations. In addition, the zinc halide solutions show an anomalous shift to higher frequencies for their solutions in D20, compared with those in H20. The perchlorate, nitrate and sulphate show no solvent isotope effect. 

Evaluation of apparent molar volumes leads to the identification of the [In(H20)6]3+ cation in aqueous solutions of non-complexing mineral acids.554 In aqueous HC1 or HBr, mixed halogeno-aquo complex cations are produced, i.e. [In(H20)5Cl]2+ etc. 

Indium halogeno complexes are similar to those of A1 and Ga but, although in non-aqueous media and in crystalline salts the InCl4 ion is tetrahedral,29 it is probably aquated in aqueous solution the species InCl2+ and InCl are also formed.30... 

Halogeno Complexes. In aqueous solutions, rather weak complexes, MF2+(aq), are formed with fluoride ion, but there is little evidence for... 

Halogeno Complexes. All the halides can form halogeno complexes, those with F and Cl- being the best known. They can be obtained by interaction of the halide and alkali halides in melts or in solvents such as SOCl2, or in the case of fluorides sometimes in aqueous solution. 

Iridium(IIl).—Group VII Donors. Halogeno-complexes. U.v.-visible spectral studies and ion exchange experiments indicate that the anomalous electrical conductivity of [IrCl ] in aqueous solution arises from aquation and ion pair formation as shown. ° ... 

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