Dissociation of a Solvate Complex

Cl4Ti(OPCl3)2 + ClgSbOPCU [Cl3Ti(OPCl3)3]+ + [SbCle]  

Agermann, M., L. H. Andersson, I. Lindqvist, and M. Zackrisson Acta Chem. Scand. 12, 477 (1958). 

Since water meets these requirements for many compounds, it is an excellent ionizing solvent. Frequently the replacement of ligands by water molecules takes place so readily that no intermediate steps such as halonium compounds are formed. 

When aluminium trichloride is dissolved in water, the complete replacement of chloride by water molecules with additional coordination of water molecules takes place and polynuclear hydrated is finally found in its solution. Intermediate species, such as [AlClJfoiv., can be detected in phosphorus oxychloride or in phenyl phosphonic dichloride jn the presence of antimony(V) chloride or ferric chloride . Other chloronium ions are formed in solvents of moderate donor number in the presence of a suitable acceptor . 

In a solvent of high DNsbCU such ionization is complete and all metal-halide bonds are replaced by metal-solvent bonds. Dimethyl sulphoxide (DMSO, DNsbCis = 30) is a solvent favouring ionization of halides. Ferric chloride does not accept chloride ions to give [FeC ] in this solvent even in the presence of a large excess chloride ions. The conducting solutions contain [Fe(DMSO)6] + and chloride ions . The same is true for its solutions in tributylphosphate. 

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