Investigation of triplet states, radical ions, and triplet excimers produced by laser photoexcitation of phenyldibenzophosphole in fluid solutions and rigid media

Journal Article · Thu Jun 02 00:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100073a017· OSTI ID:6970443

Ganguly, T; Burkhart, R D; Nelson, J H ^[1]

---

1. Univ. of Nevada, Reno, NV (United States)

Phenyldibenzophosphole (PDP), which is the phosphorous analogue of N-phenylcarbazole, yields excited singlet states, triplet states, radical cations, and anions, as well as excimeric species upon laser photoexcitation in fluid solutions or in rigid media such as polystyrene films. Delayed-fluorescence occurs concurrently either by T-T annihilation or by the E-type process of thermally induced reverse intersystem crossing depending upon the solvent and the transient population of triplets. In solvents of high dielectric constant such as N,N-dimethylformamide (DMF) or ethanol/glycerol (30/70v/v) (EtOH/glycerol), transient absorption signals due to triplet states and to radical cations and anions are observed. The purposeful introduction of electron donors or acceptors enhances the transient signals due to cations or anions, respectively, when DMF is the solvent. In EtOH/glycerol triplet excimers are produced by ion recombination, but in rigid media it appears that exciton migration and trapping at excimer forming sites take place. 43 refs., 11 figs., 2 tabs.

• DOE Contract Number: FG03-92ER45476
• OSTI ID: 6970443
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 98:22; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AROMATICS
EXCITED STATES
FLUORESCENCE
PHOTOLYSIS
ORGANIC PHOSPHORUS COMPOUNDS
COMPILED DATA
ETHANOL
EXCITONS
FLUORESCENCE SPECTROSCOPY
GLYCEROL
IONS
LASERS
PHOSPHORESCENCE
POLYSTYRENE
RADICALS
RECOMBINATION
SOLUTIONS
TRIPLETS
ALCOHOLS
CHARGED PARTICLES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
DISPERSIONS
EMISSION SPECTROSCOPY
ENERGY LEVELS
HYDROXY COMPOUNDS
INFORMATION
LUMINESCENCE
MATERIALS
MIXTURES
MULTIPLETS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOTOCHEMICAL REACTIONS
PLASTICS
POLYMERS
POLYOLEFINS
POLYVINYLS
QUASI PARTICLES
SPECTROSCOPY
SYNTHETIC MATERIALS
400500* - Photochemistry
400201 - Chemical & Physicochemical Properties
400102 - Chemical & Spectral Procedures