Abstract
Solutions of ThCl 4 in anhydrous dimethylsulfoxide or propylene carbonate have been investigated by dc polarography and controlled potential chronoamperometry on a hanging mercury drop electrode. The results are interpreted by assuming that the cathodic reduction of thorium on mercury proceeds through one step Th(IV)+4 e→Th(0) ( E 1/2⋍−1.65V vs. SCE in DMSO); however, the results obtained indicate that the reduction gives rise to the the formation of an autoinhibiting monoatomic layer of thorium; further reduction of thorium on this requires an overpotential ( E 1/2⋍−2.15 V vs. SCE in DMSO). The mean value for the maximal superficial concentration of thorium in the film deduced from these experiments equals 1.25×10 −9 mol cm −2, whereas the value for a hexagonal close-packed layer is 1.5×10 −9 mol cm −2.
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