New ruthenium complexes from Ru-3(CO)(12) and 6-alkyl- or 6-phenyl-2-hydroxypyridines

摘要

Trirutheniumdodecacarbonyl (RU3(CO)(12)) reacts with 2-hydroxy-6-methylpyridine and with 2-hydroxy-5,6,7,8-tetrahydroquinoline in toluene to form centrosymmetric tetranuclear complexes of the type [Ru(eta(2), mu-L)(CO)(2)(mu(3)-L)Ru(CO)(2)](2), where L is the respective (N,O)-pyridonate ligand (2 and 3). The structures of these complexes, which are almost insoluble in all common solvents, could be determined by single-crystal X-ray diffraction. Reaction of Ru-3(CO)(12) with 2-hydroxy-4,6-diphenylpyridine in methanol includes ortho-metallation at the phenyl ring, furnishing the dinuclear complex [Ru(kappa(2)N, C-L)(CO)(2)(mu-OCH3)(2)Ru(CO)(2) (kappa 2N, C-L)] (4), where L = (2-(6-hydroxy-4-phenylpyridin-2-yl)phenyl), according to an X-ray crystal structure determination. (c) 2005 Elsevier B.V. All rights reserved.