J. Phys. IV France 03 (1993) C8-361-C8-364
Fractal surface of amorphous platinum pyrimidine complexes in solid state as revealed by anomalous small angle scatteringR. SERIMAA1, T. LAITALAINEN2, M.J. REGAN3 and A. BIENENSTOCK3
1 Department of Physics, P.O. Box 9, University of Helsinki, 00014 Helsinki, Finland
2 Department of Chemistry, P.O. Box 6, University of Helsinki, 00014 Helsinki, Finland
3 Stanford Synchrotron Radiation Laboratory, Bin 69, Stanford, P.O. Box 4349, CA 94305, U.S.A.
The amorphous platinum greens, which were synthesized from Pt(NH3)2(H2O)2(NO3)2 or from Pt(NH3)2(H2O)2(SO4) 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 Å. Thus it was concluded that the aggregates barely nucleate during the reaction and grow during the precipitation with acetone.
© EDP Sciences 1993