STRUCTURAL CHARACTERISTICS OF THE COORDINATION NODES OF THE ANTICARCINOGENIC DIMERIC COMPLEX DI-MU-GUANINE-BIS[CIS-DICHLOROAQUOPLATINUM(II)] IN THE CRYSTALLINE TETRAHYDRATE

Structural characteristics of coordination nodes in the anticarcinogen ic crystalline hydrate of the di-mu-guanine-bis-[cis-dichloroaquoplati num(II)] dimeric complex were investigated by IR, NMR (H-1, C-13, and Pt-195), and EXAFS methods. The guanine molecules in the keto form of the complex bridge the platinum atoms by the head-to-tail principle, a nd the coordination nodes are polyhedra of pentacoordinated platinum(I I), PtCl2NO2, with the distances R(Pt-Cl) = 2.44 Angstrom and R(Pt-N(O )) = 2.06 Angstrom. The distances front the platinum atom to the neare st atoms not chemically bonded to the metal are R(Pt-C) = 2.86 Angstro m and R(Pt-Pt) = 5 Angstrom.