Halogenation of Ru(COD)(8-quinolinolate)(2) and Ru(COD)(5-formyl-8-quinolinolate)(2)

摘要

An improved synthesis of Ru(COD)(8-quinolinolate)(2) (COD = 1,5-cyclooctadiene) and the synthesis of Ru(COD)(5-formyl-8quinolinolate)(2) is reported. Electrophilic halogenation of these complexes with N-halosuccinimides proceeded smoothly resulting in 5,7-dihalogenation of the quinolinolate ligands in Ru(COD)(8-quinolinolate)(2) and in 7-halogenation of Ru(COD)(5-formyl-8-quinolinolate)(2). All compounds exhibit strong absorbance in the visible up to 500 nm, resulting in an intensively yellow colour. With all complexes no luminescence was observed. (c) 2005 Elsevier B.V. All rights reserved.