Synthesis and crystal structure of cis-diammineplatinum .alpha.-pyridone blue

Temperature Dependent ESR Studies on Platinum Pyrimidine “Blues”: Evidence for a Structural Instability ?

“…The same holds true for their detailed molecular structure, as structure analysis is severely impeded by the fact that the compounds have never been obtained in the crystalline form. It is generally assumed, however, that the "blues" form oligomeric compounds as a result of partial oxidation and axial stacking of planar Pt monomers [2][3][4][5][6][7][8][9][10][11][12]. This assumption is consistent with X-ray diffraction studies of a crystalline PDDa-a-pyridone system [6].…”

“…In terms of an idealized model it appears plausible to envisage those oligomers as a discordered ID system. The discorder, as described by a random potential VR, may arise from variations of the local ligand-to-Pt stoichiometries and from distortions of the ideal ID geometry found for instance in the case of PDDa-apyrimidine from X-ray analysis [6,7]. These effects can be expected to be especially pronounced after short reaction times.…”

The vibrational spectra, crystal and molecular structure of bis(acetonitrile)dichloroplatinum(II)

“…These "platinum blues" are obtained from the reaction of pyrimidines with cis-dichlorodiammineplatinum(I1) (2) and also from the reaction of platinum(I1) complexes with carbohydrates (3). Lippard et al (4) have prepared a "platinum blue" with a-pyridone units bridging pairs of platinum atoms, which also each have two cisammine groups coordinated to them.…”

An Improved Regularization Technique for Analysis of Anomalous X-ray Scattering Data; Platinum Uridine Blue Sulfate as an Example

“…The shortest Pt-Pt distance of 2.94 A of Pt-uridine blue (Teo, Kijima & Bau, 1978) was determined for the first time by means of the extended X-ray absorption fine structure method (EXAFS). Results of our WAXS (Serimaa, Vahvaselk/i, Paakkari, Laitalainen & Oksanen, 1993) and EXAFS (Eteliiniemi, Serimaa, Paakkari & Laitalainen, 1996) studies of Pturidine blue sulfate synthesized by a newer method (Okuno, Tonosaki, Inoue, Yonemitsu & Sasaki, 1986;Serimaa et al, 1993) are comparable to those of Teo et al (1978) and suggest Pt-structures analogous to crystalline models (Barton, Rabinowitz, Szalda & Lippard, 1977;O'Halloran, Mascharak, Williams, Roberts & Lippard, 1987;Matsumoto, Takahashi & Fuwa, 1984, and references therein). The length of the Pt-chain cannot be determined unambigously from the total radial distribution function (RDF).…”