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.