Photochemistry of squaraine dyes. 8. Photophysical properties of crown ether squaraine fluoroionophores and their metal ion complexes

Journal Article · Thu Sep 15 00:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100088a033· OSTI ID:6835218

Das, S; Thomas, K G; Thomas, K J ^[1]; Kamat, P V ^[2]; George, M V ^[3]

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1. Regional Research Lab., Trivandrum (India)
2. Univ. of Notre Dame, IN (United States)
3. Regional Research Lab., Trivandrum (India) Univ. of Notre Dame, IN (United States) Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India)

The photophysical properties of a series of red-sensitive, highly fluorescent bis[4-(monoaza-crown ether)-phenyl]squaraine fluoroionophores are reported. These dyes are soluble in both polar and nonpolar solvents with fluorescence quantum yield varying from 0.01 to 0.85. These dyes readily form aggregates in aqueous solutions. These aggregates dissociate in [beta]-cyclodextrin solutions as the dye molecules form 1:1 complex with [beta]-cyclodextrin. This complexation process is accompanied by a significant enhancement in the fluorescence yields of these dyes. Complexation of the fluoroionophores with alkali-metal ions brings about drastic reductions in their fluorescence quantum yield as well as significant changes in their redox properties. 35 refs., 9 figs., 3 tabs.

• OSTI ID: 6835218
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 98:37; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
COMPLEXES
FLUORESCENCE
INFRARED SPECTRA
MASS SPECTROSCOPY
NUCLEAR MAGNETIC RESONANCE
REDOX REACTIONS
DYES
ALKALI METAL COMPOUNDS
COMPILED DATA
CROWN ETHERS
DEXTRIN
MATHEMATICAL MODELS
PHOTOLYSIS
CARBOHYDRATES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ETHERS
INFORMATION
LUMINESCENCE
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
POLYSACCHARIDES
RESONANCE
SACCHARIDES
SPECTRA
SPECTROSCOPY
400201* - Chemical & Physicochemical Properties
400500 - Photochemistry
400102 - Chemical & Spectral Procedures
990200 - Mathematics & Computers