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The reactivity of nitrosyl ruthenium complexes containing polypyridyl ligands

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Abstract

A series of cis nitrosyl complexes containing polypyridyl ligands were prepared and characterized as cis-[RuL(bpy)2(NO)](PF6)3 (L = pyridine, 4-picoline, or 4-acetylpyridine), by elemental analysis, u.v.–vis. and i.r. spectroscopy, and by electrochemical techniques such as cyclic voltammetry, differential pulse voltammetry, spectroelectrochemistry, and coulometry. The complexes exhibit stretching frequencies ν(NO) at ca. 1950 cm−1 indicating that nitrosyl group has a sufficiently high degree of nitrosonium ion (NO+) character. In non-aqueous solution, the reduction of these complexes induce nitrosyl to nitro conversion. In aqueous solution the reduction product is cis-[RuL(bpy)2(NH3)]2+ formed by a six electron mechanism. The nitrosyl compounds are susceptible to nucleophilic attack by hydroxide ion. The equilibrium constants were determined.

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Gama Sauaia, M., Santana da Silva, R. The reactivity of nitrosyl ruthenium complexes containing polypyridyl ligands. Transition Metal Chemistry 28, 254–259 (2003). https://doi.org/10.1023/A:1022964510682

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