Photoinduced intramolecular charge transfer and trans-cis isomerization of the DCM styrene dye. Picosecond and nanosecond laser spectroscopy, high-performance liquid chromatography, and nuclear magnetic resonance studies

Journal Article · Thu Jan 11 04:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100364a015· OSTI ID:6663880

Meyer, M; Mialocq, J C; Perly, B ^[1]

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1. CNRS, Gif-sur-Yvette (France)

The photoexcitation of 4-(dicyanomethylene)-2-methyl-6-(p-(dimethylamino)styryl)-4H-pyran (DCM) induces a large intramolecular charge transfer (ICT) from the dimethylamino electron-donor group to the dicyanomethylene acceptor group. The dramatic effect of the solvent polarity on the absorption and fluorescence spectra on the one hand and the competition between the nonradiative S{sub 1} {yields} S{sub 0} deactivation and trans {yields} cis isomerization processes on the other hand has been examined. Our results clearly show that DCM isomerization efficiency is very low in the more polar solvents. The S{sub 1} {yields} S{sub 0} internal conversion may intervene at a torsional angle smaller than 90{degree} before reaching the perpendicular configuration.

• OSTI ID: 6663880
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:1; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ALKYLATED AROMATICS
AROMATICS
CHARGE TRANSPORT
DATA
DATA ANALYSIS
DYES
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
LASER SPECTROSCOPY
LASERS
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MEASURING METHODS
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
RESONANCE
SPECTROSCOPY
STYRENE