The reaction of [Ru 3 (CO) 12 ] with 1-nitroso-2-naphthol (referred to as 1,2-naphthoquinone-1-oxime, Hnqo) in tetrahydrofuran ( thf) at room temperature gave two isomeric mononuclear complexes, trans-[Ru{η 2 -N(O)C 10 H 6 O} 2 (CO) 2 ] 1a and cis-[Ru{η 2 -N(O)C 10 H 6 O} 2 (CO) 2 ] 1b. Compound 1b could be converted to 1a quantitatively in acidic media. Reaction of 1a with acetylpyridine in the presence of trimethylamine N-oxide afforded trans-[Ru{η 2 -N(O)C 10 H 6 O} 2 {NC 5 H 4 C(O)CH 3 }(CO)] 2 in which one of the carbonyls was replaced by an acetylpyridine moiety. Similarly, complex 3, trans-[Ru{η 2 -N(O)C 10 H 6 O} 2 (NCMe)(CO)] was also obtained in high yield if acetonitrile was used instead of the acetylpyridine. When the reaction of [Ru 3 (CO) 12 ] and 1-nitroso-2naphthol was carried out in refluxing thf for 1 h, two minor products [Ru 3 (µ-η 3 -ONC 10 H 6 O) 2 (CO) 8 ] 4 and [Ru 3 {µη 2 -N(H)C 10 H 6 O}{µ-η 2 -N(H)C 10 H 4 (O)NOC 10 H 6 }(CO) 8 ] 5 were isolated in addition to 1a and 1b. Clusters 4 and 5 consisted of an open triruthenium metal core with the two nqo ligands (in 4) and two quinone-imine type ligands (in 5) bridging the open edge in a µ-η 3 and a µ-η 2 -manner respectively.
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