Fractal surface of amorphous platinum pyrimidine complexes in solid state as revealed by anomalous small angle scattering

The amorphous platinum greens, which were synthesized from Pt ( N H s ) ~ ( H ~ O ) ~ (N03)2 or from Pt(NH3)2(H20)2(S04) and uridine, 5-bromouridine and ftorafur, were studied in the solid state by anomalous small angle x-ray scattering. The intensity curves exhibit a power-law dependence, which is likely to originate from large aggregates that are quite compact yet have rough surfaces. The surface fractal dimension varied between 2.2-2.7. The radius of gyration of the particles in the aqueous reaction mixture before precipitation was only about 5 A. Thus it was concluded that the aggregates barely nucleate during the reaction and grow during the precipitation with acetone.