Phosphorescence properties of lower emitting states of (Ru(bpy)/sub 3/)(ClO/sub 4/)/sub 2/

Journal Article · Thu Nov 17 04:00:00 EST 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100334a009· OSTI ID:5992938

Komada, Y; Yamauchi, S; Hirota, N

The authors have made spectroscopic studies on low-lying excited states of /sup 3/d..pi..* (Ru(bpy)/sub 3/)(ClO/sub 4/)/sub 2/ in the neat crystal from 1.4 to 170 K. They have succeeded in separating the phosphorescence spectra of the three low-lying levels. The spectra were composed of sharp and broad components, whose vibronic and phonon structures are discussed in terms of vibronic coupling and an electron-phonon interaction. The decay rate constants of the three principal low-lying levels were the same within an experimental error at all temperatures down to 1.4 K, indicating an establishment of a thermal equilibrium among these states. At all temperatures decays were found to be exponential at low density excitation, but at high density excitation they showed nonexponential behavior below 20 K. The nonexponential behavior was interpreted in terms of a triplet-triplet annihilation process. They found spectroscopically two other low-lying states, which are located 800 and 3250 cm/sup /minus/1/ above the lowest emitting state, and assigned them as fourth /sup 3/d..pi..* state, respectively, from the absorption and phosphorescence excitation spectra.

• Research Organization: Kyoto Univ. (Japan)
• OSTI ID: 5992938
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:23; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ABSORPTION SPECTROSCOPY
AZINES
BIPYRIDINES
CHLORATES
CHLORINE COMPOUNDS
COMPLEXES
CRYSTALS
DATA
DE-EXCITATION
EMISSION SPECTROSCOPY
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
INFORMATION
LOW TEMPERATURE
LUMINESCENCE
MONOCRYSTALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORESCENCE
PYRIDINES
RADIATIONLESS DECAY
RUTHENIUM COMPLEXES
RYDBERG STATES
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE