aq. HCl; aq. NaOH in ethanol; water in the dark; addn. of 1 equiv. of Pt-salt to diamine in EtOH, addn. of doubly distilled H2O, pH was adjusted to 7 by adding HCl, stirring at room temp.; ppt. was collected over a period of 20 h by adjusting of pH with NaOH, ppt. was washed with water, dried over P4O10; elem. anal.;