Abstract
The concentration-dependent behavior observed for 205T1 n.m.r. resonances from thallium(I) fluorometalates, PF 6 -, WF 7 -, MoF 6 - and UF 6 -, in acetonitrile indicates that some degree of ion-pairing is present in these solutions. The paramagnetic anion, UF 6 -, has a pronounced effect on 205T1 resonance in the T1 + salt, but its effect on T1 3+ is very small. It is suggested that T1 3+ is effectively solvated by MeCN and that direct ion-pairing is unimportant. The 205T1 shielding of T1 3+ is decreased by the presence of T1 + in solution, possibly as a result of the increase in asymmetry of the T1 3+ environment.
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