Time-resolved emission spectroscopy of Ru(II) complexes around the glass transition temperature of the medium: Counteranion, ligand, and solvent effects
- Tokyo Institute of Technology (Japan)
Time-resolved emission spectroscopy of Ru(II) complexes was conducted around the glass transition temperature of a medium (T{sub g}) focusing on the effects of counteranions (Ru(bpy){sub 3}X{sub 2}; bpy = 2,2{prime}-bipyridine, X = Cl{sup {minus}}, ClO{sub 4}{sup {minus}}, and PF{sub 6}{sup {minus}}), bulky ligands (4,4{prime}-diphenyl-2,2{prime}-bipyridine), polar ligands (CN{sup {minus}} and 2,2{prime}-bipyrazine), and solvents on time-dependent (TD) emission shifts. All the Ru(II) complexes examined showed TD emission shifts in ethanol-methanol (4/1 v/v) between 120 and 150 K. Ru(bpy){sub 3}{sup 2+} showed a TD emission shift in alcoholic solvents (ethanol, 1-propanol, and 1-hexanol) while no TD shift was observed in aprotic solvents (dimethyl sulfoxide, propylene carbonate, and acetonitrile). The anomalous temperature dependence of the excited-state lifetime determined from time evolution of the relative emission quantum yield is also discussed.
- OSTI ID:
- 6712470
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:4; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison of physical and photophysical properties of monometallic and bimetallic ruthenium(II) complexes containing structurally altered diimine ligands
Multimetallic ruthenium(II) complexes based on biimidazole and bibenzimidazole: Effect of dianionic bridging ligands on Redox and spectral properties
Related Subjects
400201* -- Chemical & Physicochemical Properties
AZINES
CALCULATION METHODS
COMPLEXES
DATA
DATA ANALYSIS
EMISSION SPECTROSCOPY
ENTHALPY
EXPERIMENTAL DATA
GLASS
HETEROCYCLIC COMPOUNDS
INFORMATION
LIGANDS
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PHYSICAL PROPERTIES
PYRIDINES
RUTHENIUM COMPLEXES
SOLVENT PROPERTIES
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPLEXES
TRANSITION HEAT