Solvent, isotope, and magnetic field effects in the geminate recombination of radical ion pairs

Journal Article · Wed Mar 01 00:00:00 EST 1978 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.436013· OSTI ID:5211289

Werner, H; Staerk, H; Weller, A

The magnetic field dependence of the geminate recombination triplet yield of radical ion pairs generated via photoinduced electron transfer in polar solvents is investigated for the systems pyrene/N,N-dimethylaniline (Py/DMA), pyrene/3,5-dimethoxy-N,N-dimethylaniline (Py/DMDMA), and the perdeuterated system Py-d/sub 10//DMA-d/sub 11/. The magnetic field dependence characterized through its B/sub 1/2/ value is found to be dependent on the sum of the hyperfine coupling constants in the radical pair in agreement with previous theoretical predictions. A drastic reduction of the B/sub 1/2/ value is observed with the perdeuterated system. By means of measurements of the radical ion and triplet absorption signals with nanosecond time resolution, the influence of the solvent on the geminate singlet and triplet recombination yields is investigated. Complementary measurements of exciplex lifetimes and quantum yields are carried out in a series of solvents with different polarities in order to determine the rate constants of fluorescence emission and intersystem crossing in the exciplexes.

• Research Organization: Max-Planck-Institut fuer biophysikalische Chemie, Abt. Spektroskopie, D 3400 Goettingen, Germany
• OSTI ID: 5211289
• Journal Information: J. Chem. Phys.; (United States), Vol. 68:5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DEUTERIUM
ISOTOPE EFFECTS
AMINES
ANILINE
AROMATICS
ION PAIRS
PYRENE
RADICALS
CONDENSED AROMATICS
HYDROCARBONS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
STABLE ISOTOPES
400302* - Organic Chemistry- Isotope Effects- (-1987)