Kkh. Lee et Wt. Wong, SYNTHESES AND MOLECULAR-STRUCTURES OF RUTHENIUM CARBONYL-COMPLEXES CONTAINING 1,2-NAPHTHOQUINONE-1-OXIMATE LIGANDS, Journal of the Chemical Society. Dalton transactions, (17), 1997, pp. 2987-2995
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{eta(2)-
N(O)C10H6O}(2)(CO)(2)] la and cis-[Ru{eta(2)-N(O)C10H6O}(2)(CO)(2)] 1b
. Compound Ib could be converted to la quantitatively in acidic media.
Reaction of la with acetylpyridine in the presence of trimethylamine
N-oxide afforded trans-[Ru{eta(2)-N(O)C10H6O}(2){NC5H4C(O)CH3}(CO)] 2
in which one of the carbonyls was replaced by an acetylpyridine moiety
. Similarly, complex 3, trans-[Ru{eta(2)-N(O)C10H6O}(2)(NCMe)(CO)] was
also obtained in high yield if acetonitrile was used instead of the a
cetylpyridine. When the reaction of [Ru-3(CO)(12)] and 1-nitroso-2-nap
hthol was carried out in refluxing thf for 1 h, two minor products [Ru
-3(mu-eta(3)-ONC10H6O)(2)(CO)(8)] 4 and N(H)C10H6O}{mu-eta(2)-N(H)C10H
4(O)NOC10H6}(CO)(8)] 5 were isolated in addition to la and Ib. Cluster
s 4 and 5 consisted of an open triruthenium metal core with the two nq
o ligands (in 4) and two quinone-imine type ligands (in 5) bridging th
e open edge in a mu-eta(3) and a mu-eta(2)-manner respectively.