Picosecond transient absorption spectra of aminosalicylates in confirmation of the triple excitation mechanism

Journal Article · Thu Aug 10 04:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100353a010· OSTI ID:7072530

Gormin, D ^[1]

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1. Florida State Univ., Tallahassee (USA)

Using picosecond transient absorption studies, it is shown that the twisted intramolecular charge-transfer state (TICT) and the excited intramolecular proton-transfer state (ESIPT or PT) of specific aminosalicylates both contribute to the long-wavelength fluorescence band, F{sub 2}, observed as an unresolved band to the red of the normal fluorescence band, F{sub 1}. The transient absorption band for 2-hydroxy-4-(dimethylamino)benzoic acid methyl ester (PDASE) is shown to be a composite of the two excited-state absorption modes: S{sub n}{double prime}(TICT) {l arrow} S{sub 1}{double prime} (TICT) and S{sub n}{prime}(PT){l arrow} S{sub 1}{prime}(PT). This corroborates previous steady-state fluorescence studies of the unresolved F{sub 2} band. The assignments are based on comparison with the excited-state absorption spectra of various substituted aminosalicylates in polar and nonpolar solvents.

• OSTI ID: 7072530
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:16; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000* -- Chemistry
400102 -- Chemical & Spectral Procedures
ABSORPTION SPECTRA
AMINES
CARBOXYLIC ACIDS
DATA
DATA ANALYSIS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HYDROXY ACIDS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
SALICYLIC ACID
SOLVENTS
SPECTRA