Osmium complexes pyrimidines

In this section we consider the osmium complexes of the three potentially bifunctional ligands pyrazine (pyz), pyrimidine (pym) and pyridazine (pyd) (Table 8). All form terminal complexes with... 

Pyridinium tetrachloroantimonite, secondary bonding by, 15 32-33 p-Pyrimidine complexes, osmium, 37 307 2-Pyrimidinethiolato complexes, osmium, 37 295-296... 

Salts of [OsL(NH3)5]3+ (L = pyrazine, pyrimidine, pyridazine) can be made by displacement of nitrogen from [Os(N2)(NH3)5]2+9° or from the triflato complex [0s(0S02CF3)(NH3)J]2+ and the ligands.62 Cyclic voltammetry showed reduction to the osmium(II) species, 90 and the surface-enhanced Raman spectra (SERS) of [Os(pyz)(HNH3)5]3+, [Os(pyz)(NH3)5]2+ and of their ammine-d5 derivatives were measured, as were the IR spectra.91... 

Osmium Tetroxide-Pyridine. Osmium(VI) tetroxide is one of the most extensively used probes for DNA structure. It is an example of a high-valent transition metal complex which, due to its uniquely reactive center, is able to functionalize specific bonds on DNA. This powerful oxidant is known to form cisoid osmate esters upon attack of an electron-rich double bond. By tuning the reactivity of OSO4 and its esters with the addition of other ligands, it has been possible to generate a family of reactive probes for exposed pyrimidine bases. 

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