in water K2PtCl4 dissolved in boiling water; cooled; ligand (10percent excess) added; after 1 h ppt. filtered; recrystd. (hot water contg. some HCl); filtrateconcd. on rotary evaporator; Pt(NH3)4Cl2 added; mixt. heated with stirr ing; Pt(NH3)4PtCl4 collected on filter; ppt. was obtained from filtrate;washed (aq. HCl, EtOH); elem. anal.;

in methanol Kinetics; byproducts: Fe(C5H5)2(1+), Cl(1-); at 25-45°C; monitored by UV (280-400 nm);

in methanol Kinetics; reduction of Pt(IV)-complex by Pt(II)-complex in MeOH in the presence of chloride ions depending on temperature (25, 35, 45°C); monitored by UV-spectroscopy;