Abstract
The nitrido-bridged osmium(IV) binuclear complexes (Os{sub 2}N(NH{sub 3}){sub 8}Cl{sub 2})Cl{sub 3} {times} 2H{sub 2}O (I) and (Os{sub 2}N(NH{sub 3}){sub 7}Cl{sub 3})Cl{sub 2} {times} H{sub 2}O (II) have been shown to be products of the ammonolysis of sodium hexachloroosmate(IV) (Na{sub 2}(OsCl{sub 6})) in aqueous ammonia at elevated temperatures. Spectral (infrared and uv-vis) and electrochemical properties of the complexes have been explored. In aqueous solution, I and II undergo aquation reactions involving the chloro ligands, and the resulting aqua complexes of I and II exhibit respectively two and three ionizable protons with pK{sub a} values in the range 3.6-7.3. In purified form, the complexes I and II plus their aquated derivatives were found to be ineffective as DNA-selective, electron-dense stains for electron microscopy, whereas effective staining was observed with unpurified mixtures. 26 refs., 1 fig., 1 tab.
Published Version
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