Abstract
In order to obtain monolayers of wholly π-conjugated derivatives with improved stability and homogeneity, oligo(phenylenevinylene derivatives with different numbers of phenylenevinylene units, different hydrophilic groups and different substituents at the end of the hydrophobic π-conjugated chain were synthesized and their surface pressure—area isotherms and fluorescence microscopy images were examined. The presence of two phenylenevinylene units was suitable for monolayer formation. Monolayers with improved stability were obtainable from sulfonamide derivatives with a tert-butyl or an octadecyl group at the hydrophobic ends and from a derivative which had a sulfonamide group between the π-conjugated structure and an alkyl spacer group Fluorescence microscopy revealed that the tert-butyl derivative formed a homogeneous monolayer in the condensed region. The effects of the substituents upon the monolayer properties were discussed.
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