Abstract
The relative formation constants KL* of some uranyl tropolonate adducts with neutral ligands L (L = cyclopenta-none, pyridine, dimethyl sulphoxide, 4-chloropyridine N-oxide, 4-methylpyridine N-oxide, triphenylphosphine oxide, and triphenylarsine oxide) of general formula [UO2(trop)2L](Htrop = tropolone) have been determined spectrophotometrically by studying the equilibria [{UO2(trop)2}2]+ 2L ⇌ 2[UO2(trop)2L] in benzene at 25 °C. The KL* sequence obtained can be used as a quantitative scale of donor ability of the various neutral ligands toward the common substrate. Other attempted qualitative correlations based on i.r. 1H n.m.r. and thermal measurements are compared and discussed.
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