Photoirradiation reactions and crystal structures of two geometrical isomers of [Ru(OAc)(2cqn)(2)NO] (H2cqn=2-chloro-8-quinolinol)

摘要

The photoirradiation reactions of two geometrical isomers (cis-1 and cis-2) of [Ru(OAc)(2cqn)(2)NO] (H2cqn = 2-chloro-8-quinolinol) were studied. Cis-2 [Ru(OAc)(2cqn)(2)NO] (2) photochemically isomerized to cis-1 [Ru(OAc)(2cqn)(2)NO] (1) in CH2Cl2 or DMSO using an Xe lamp as a light source and the reaction was irreversible. The 2 to 1 isomerization coexisting with (NO)-N-15 gas and its evolution of the H-1 NMR spectra showed that the dissociation and recombination of both the NO and the acetate ion involve in the isomerization. On the other hand, 1 did not isomerize but the NO ligand exchanged with (NO)-N-15. The crystal structures of 1 and 2 were determined by X-ray diffraction. (C) 2003 Elsevier B.V. All rights reserved.