4854
J. Phys. Chem. B 2002, 106, 4854-4862
Picosecond Coherent Vibrational Spectroscopy (CARS) of a DNA-Intercalating Ru Complex Laszlo Ujj,†,‡ Colin G. Coates,§ John M. Kelly,*,| Paul E. Kruger,| John J. McGarvey,*,§ and George H. Atkinson*,† Department of Chemistry and Optical Science Center, UniVersity of Arizona, Tucson, Arizona 85721, Department of Chemistry, Queens UniVersity, Belfast, Northern Ireland, Department of Chemistry, Trinity College, UniVersity of Dublin, Dublin, Ireland, and Department of Physics, UniVersity of West Florida, Pensacola, Florida 32514 ReceiVed: June 27, 2001; In Final Form: January 28, 2002
Vibrational spectra (1100-1800 cm-1) of the ground state and two excited electronic states, populated following the 5 ps, 440 nm excitation, of the [Ru(phen)2dppz]+2 (phen ) 1,10-phenanthroline and dppz ) dipyrido[3,2-a:2′,3′-c] phenazine) complex in aqueous solution are measured by coherent anti-Stokes Raman scattering (CARS). The band origin positions of vibrational features in the picosecond resonance CARS (PR/CARS) spectrum of ground state [Ru(phen)2dppz]+2 obtained with ω1 (probe) wavelengths of 491 and 530 nm are the same to within
