Laser flash photolysis and pulse radiolysis studies of ruthenium complexes
- North East Wales Institute (United Kingdom)
- Univ. of Yarmouk, Irbid (Jordan)
The absorption spectra of charge-transfer excited states and one-electron-reduced states of a number of mono- and binuclear ruthenium complexes in water have been obtained using laser flash photolysis and pulse radiolysis techniques. For Ru(dhp)[sub 3][sup +*], the absorption bands are assigned by comparison with Ru(bpy)[sub 3][sup +*]. The spectra obtained for Ru(dpp)[sub 3][sup +*] and Ru(dpq)[sub 3][sup +*] are similar to their respective ground-state absorption spectra. Bimolecular rate constants for the reaction of e[sub aq] with the above complexes as well as with the mixed-ligand complexes Ru(bpy)[sub 2]dpp[sup 2+] and Ru(bpy)[sub 2]dhp[sup 2+], were also determined. From their characteristic absorption spectra and the bimolecular rate constants, it was concluded that the added electron is localized on one of the ligands. The excited-state absorption spectra of the two mixed-ligand complexes showed bands at 360 and 450 nm attributed to [pi]-[pi]* transitions of the ligand anion radical. The lifetimes of the excited states of the complexes decreased on changing the solvent from acetonitrile to water. It was also observed that the lifetimes of the excited states of the binuclear complexes were shorter than those of the corresponding mononuclear complexes.
- OSTI ID:
- 5035288
- Journal Information:
- Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 33:1; ISSN 0020-1669; ISSN INOCAJ
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500 -- Photochemistry
400600* -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
BEAMS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPLEXES
DECOMPOSITION
ELECTRON BEAMS
KINETICS
LEPTON BEAMS
PARTICLE BEAMS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS
RUTHENIUM COMPLEXES
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES