Chromicity PAEs

PAEs are chromic and reveal fascinating spectroscopic properties upon exposure to external stimuli. The UV-vis and fluorescence properties of selected PAEs are treated with regard to inter- and intrachain processes and a model for the spectral changes in PPEs is developed. In the last part, the uses of PAEs as fluorescent sensors and in semiconductor devices are discussed. 

The chromicity of poly(aryleneediynylene)s (PAE) is discussed and described in diis contribution. Four different types of PAEs will be scrutinized a) dialkyl-poly(para-phenylene-ethynylene)s (dialkyl-PPEs), b) dialkoxy-PPEs, c) acceptor substituted PPEs, and d) heteroaryleneethynylenes that contain benzothiadiazole units in their main chain. We will shortly describe their syntheses and then discuss their spectral properties in absorption and emission in solution and in thin films. 

Once heteroatoms are introduced into the PAEs, further manipulation of dieir chromic behavior is possible. The two PAEs 8 and 9 contain quinoline and benzothiadiazole units in their backbone. The presence of a basic nitrogen makes... 

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