Photophysical studies of [alpha],[omega]-dicyano-oligothiophenes NC[([C.sub.4][H.sub.2]S).sub.n]CN (n=1-6)

Article Abstract:

The photophysics of 6 oligothiophenes end-capped with cyano groups (CN[alpha]n) was examined in solution both at room and low temperature. The introduction of two strongly electron withdrawing cyano groups was found to spread the [pi] electron clod from the oligothiophene skeleton out to the CN group as a consequence, the difference between the highest occupied molecular orbital and lowest unoccupied molecular orbital was found to decrease leading to a general red shift of the absorption and emission bands of the CN[alpha]n's relative to the [alpha]n's.

Phosphorescence

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Interaction between the water soluble poly{1,4-phenylene-[9,9-bis(4-phenoxy butylsulfonate)]fluorene-2,7-diyl} copolymer and ionic surfactants followed by spectroscopic and conductivity measurements

Article Abstract:

The interaction of poly{1,4-phenylene-[9,9-bis(4-phenoxy butylsulfonate)]fluorene-2,7-diyl} copolymer (PBS-PFP) is studied using electronic absorption and emission spectroscopy and electrical conductivity. The nature of the polymer and surfactant interactions can be used to control the spectroscopic and conductivity properties of the polymer, which may have implications in its applications.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Sulfolane, Copolymers, Sulfones, Butyl compounds

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Spectral and photophysical studies on cruciform oligothiophenes in solution and the solid state

Article Abstract:

The photophysical and spectroscopic properties of a class of oligothiophene derivatives, designated as cruciform oligomers, are investigated in solution and in the solid state. The results suggest that in solution, the main deactivation channels for the compounds are the radiationaless processes and in solid state, the fluorescence quantum yields decrease relative to solution.

Fluorescence, Properties

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