REACTIONS OF BIMETALLIC COMPLEXES OF PALLADIUM (II) WITH STANNUM(II) LIGANDS IN WATER SOLUTIONS OF HYDROCHLORIC ACID
Intramolecular red-ox reactions of Pd(II) - St complexes in 1M water solutions of HCl were studied with electron spectrophotometer methods. It was supposed that at the early stages the reduction products consist of hetero-nuclear clusters of Pd3Snx (х = 5, 8) type with low oxidation degrees of Palladium later forming colloid particles. It was found that the resulting product of Pd(II)-Sn complexes reactions is an Pd3Sn alloy in the form of micro dispersed powder. The average diameter of queasy spherical particles is 70 nm with the range of 30 - 110 nm. Diffraction pictures of the Pd3Sn powders produced in different condition are typical for structures with side-central cubic network (period а = 3.98 А0). Element electron condition in Pd3Sn powders is described by the features of X-ray photoelectron spectra. The formal stoichiometry of the reaction 3Pd(II) + 5Sn(II) = Pd3Sn + 4Sn(IV).The method of nanodispersed intermetallic Pd3Sn powders synthesis from water solutions of hydrochloric, sulphuric, hydrofluorine and citric acids was developed. It was found that the acid nature does not influence the reaction features of Pd(II)-Sn complex. The influence of such factors as the medium acidity, temperature, palladium concentration in solution and the contact area of the solution with air have been found.