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 · Wed Mar 02 00:00:00 EST 1988 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00213a001· OSTI ID:7256251

Myrick, M L; Blakley, R L; DeArmond, M K; Arthur, M L

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), Vol. 110:5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BIPYRIDINES
ELECTRONIC STRUCTURE
IMINES
ORGANIC FLUORINE COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHENANTHROLINES
PYRAZINES
QUINOLINES
RUTHENIUM COMPLEXES
ABSORPTION SPECTROSCOPY
EMISSION SPECTROSCOPY
EXCITED STATES
EXPERIMENTAL DATA
LIGANDS
LOW TEMPERATURE
SOLUTES
SOLVENT PROPERTIES
SOLVENTS
AROMATICS
AZAARENES
AZINES
COMPLEXES
DATA
ENERGY LEVELS
HETEROCYCLIC COMPOUNDS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES
400201* - Chemical & Physicochemical Properties