| Abstract: | Abstract Palladium(II) forms 1:1 and 1:4 complexes with allyl thiourea. The molar composition of the complexes was determined by molar-ratio and continuous variation methods and confirmed by means of elemental analysis of the compounds isolated from solution. Conformity to Beer's law was observed for up to 12 μg ml?1 of 4 palladium in strongly acidic medium (molar absorptivity 2.28×104 1 mol?1 cm?1 at 292 nm);the Sandell's sensitivity of the reaction for palladium is 0.0047 μg cm?2 per 0.001 absorbance unit. The tolerance of the system to platinum metals and other common cations is satisfactory. A statistical evaluation of the analytical procedure of palladium determination has been undertaken. The infrared spectra of allyl thiourea and of its 1:1 and 1:4 palladium complexes have been measured in the 2.5–50μ region. The absorption bands have been assigned. The spectra reveal that allyl thiourea forms sulphur-to-metal bonds only, rather than nitrogen-to-metal bonds in the complexes studied. |
