Pressure dependence on the kinetics of photoinduced intramolecular charge separation in 9,9 prime -bianthryl monitored by picosecond transient absorption: Comparison with electron transfer in photosynthesis

Journal Article · Thu May 31 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100374a037· OSTI ID:6378509

Lueck, H; Windsor, M W ^[1]; Rettig, W ^[2]

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1. Washington State Univ., Pullman (USA)
2. Technical Univ. of Berlin (West Germany)

Transient absorption spectra of 9,9{prime}-bianthryl (BA) in the picosecond time range have been recorded in nonpolar cyclohexane (CH), in polar acetonitrile (ACN), and in the highly viscous solvent glycerol triacetate (GTA). High pressure (0.1-300 MPa) is employed to vary the solvent properties of GTA over an unusually wide range. To our knowledge, this is the first time that picosecond absorption spectra at high pressures have been reported. Transient spectra (25-ps resolution) in GTA can be resolved into an anthracene-like band corresponding to the locally excited state (LE) and a longer wavelength band corresponding to the twisted intramolecular charge transfer state (TICT). Comparisons are made between ET in BA/GTA and ET in the photosynthetic bacterial reaction center. They suggest that the microscopic structure of the protein in which the chromophores are embedded not only induces the asymmetric charge separation but also provides a polar solvent environment optimized for fast activationless ET and preformed to stabilize the charge-separated chromophores.

• OSTI ID: 6378509
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:11; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ABSORPTION SPECTRA
CHEMICAL REACTIONS
DATA
DATA ANALYSIS
ELECTRON TRANSFER
EXPERIMENTAL DATA
INFORMATION
KINETICS
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
PHOTOCHEMICAL REACTIONS
PHOTOCHROMIC MATERIALS
PHOTOSYNTHESIS
PHOTOSYNTHETIC REACTION CENTERS
PRESSURE DEPENDENCE
SPECTRA
SYNTHESIS