Comment on 'Resonance Raman Investigation of (Ru(phen)2(dppz)2+) and related complexes in water and in the presence of DNA.'

Some of the results of a study conducted by W. Chen, et al, on the interaction between (Ru(phen)2dppz)2+ and DNA invite comment. The lowest excited state of ruthenium(II) dppz complexes generated confusion resulting from data for rhenium-(I) dppz complexes. Chen's suggestion on the identity of the species responsible for TR2 spectra was also unlikely. In addition, the researchers should have considered the detection of the pseudo-steady-state population during a 10 ns laser pulse.