Heavy transition metal complexes of biologically important molecules. 3. Crystal and molecular structure of bis(.mu.-1-methylthyminato-N3,O4)bis(cis-diammineplatinum(II)) dinitrate hydrate, [(NH3)2Pt(C6H7N2O2)2Pt(NH3)2](NO3)2.H2O

Solid state structure, magnetic susceptibility, and single crystal ESR properties of cis-diammineplatinum .alpha.-pyridone blue

“…Recently, the structure of a czT-diammineplatinum(II) 1methylthymine dimer, isolated from the reaction mixture of the platinum 1-methylthymine blue, has been reported. 25 The geometry of this complex bears a close resemblance to that of m-diammineplatinum -pyridone blue. Two 1-methylthyminate ligands use their heterocyclic, deprotonated ring nitrogen, N3, and exocyclic oxygen, 04, atoms to bridge two cz'j-diammineplatinum units.…”

“…The average formal platinum oxidation state is therefore 2. 25. Magnetic susceptibility measurements of the solid over the range 4.2 K < T < 300 K show c/s-diammineplatinum -pyridone blue to be a simple Curie paramagnet.…”

Chemical and spectroscopic characterization of cis-diammineplatinum .alpha.-pyridone blue in aqueous solution. Comparison with other platinum blues

“…The polymeric uracil blue could be extended using alternate single bridged uracilate anions rather than through doubly bridged species found in the structures of PPB and the c/x-diammineplatinum 1-methylthyminate dimer. 28 It is this double bridged arrangement that precludes further oligomerization of PPB owing to the steric factors imposed by the -pyridonate ring.11 Some proposals for the structure of PU B are given in Figure 9. Uracil offers two distinct sites for bridged metal coordination, N1 and 02, or N3 and 04.…”

Potassium thyminate trihydrate, K(C5H5N2O2).3H2O

“…. If, however, N(1) is blocked, as in the 1-methylthyminate anion, coordination occurs through N(3) (Kosturko, Folzer & Stewart, 1974) or even to two Pt atoms through N(3) and 0(4) (Lock, Peresie, Rosenberg & Turner, 1978). In this latter case the C(2)-O(2) and C(4)-O(4) distances are significantly different although no such difference was observed when Pt was bonded to N(1) .…”