Abstract
Thallium-205 n.m.r. spectra have been determined for toluene solutions of a series of 11 thallium(I) alkoxides including five previously unreported compounds. The observed spectra are consistent with the predominance of tetrameric species, [{Tl(OR)}4](R = alkyl group), in solution. The essentially three-line spectra arise from thallium-203–thallium-205 spin–spin coupling with J(203Tl–205Tl) in the range 2 170–2 769 Hz. The thallium-205 chemical shifts span 434 p.p.m. and show some dependence on the nature of the alkyl group. There is no apparent correlation of J(203Tl–205Tl) with the properties of the alkyl groups. The values of J(203Tl–205Tl) are compared with those found for dimeric dimethylthallium(III) derivatives and are discussed in terms of the Fermicontact contribution to the coupling mechanism.
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