Evidence for static localization in the lowest optically excited states of ruthenium(II) diimine complexes: a solvent- and time-dependent photoselection study at 77 K
Journal Article
·
· J. Am. Chem. Soc.; (United States)
The 77 K absorption, emission, steady-state excitation photoselection (SSExP), and time-resolved excitation photoselection (TRExP) results are reported for 11 (Ru(L)/sub 3/)(PF/sub 6/)/sub 2/ complexes with 2,2'-diimine ligands (L). The ligands are 2,2'-bipyridine (bpy), 1,10-phenanthroline (phen), 2,2'-bipyrazine (bpz), 2-(2-pyridyl)quinoline (pq), and 2,2'-biquinoline (biq). Complexes of the form (Ru(L)/sub 3/)/sup 2 +/ (L = bpy, phen, bpz, pq, and biq) were examined as well as mixed-ligand complexes of the form (Ru(bpy)/sub n/(L)/sub 3-n/)/sup 2 +/ (n = 1, 2) (L = phen, bpz, and pq). Data are also presented for the monomeric model complex, (Ru(bpy)(py)/sub 4/)/sup 2 +/ (py = pyridine). Data indicate that optical excitation leads to static localization of the optically excited electron. A model is developed that rationalizes the maximum value obtainable in the SSExP data. Solvent effects observed in the TRExP data are explained in terms of relative rates of spin-lattice relaxation associated with different solvents.
- Research Organization:
- North Carolina State Univ., Raleigh (USA)
- OSTI ID:
- 7256251
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 110:5; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
AROMATICS
AZAARENES
AZINES
BIPYRIDINES
COMPLEXES
DATA
ELECTRONIC STRUCTURE
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
IMINES
INFORMATION
LIGANDS
LOW TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHENANTHROLINES
PYRAZINES
PYRIDINES
QUINOLINES
RUTHENIUM COMPLEXES
SOLUTES
SOLVENT PROPERTIES
SOLVENTS
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
AROMATICS
AZAARENES
AZINES
BIPYRIDINES
COMPLEXES
DATA
ELECTRONIC STRUCTURE
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
IMINES
INFORMATION
LIGANDS
LOW TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHENANTHROLINES
PYRAZINES
PYRIDINES
QUINOLINES
RUTHENIUM COMPLEXES
SOLUTES
SOLVENT PROPERTIES
SOLVENTS
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES