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The synthesis, optical properties, and solid-state structures of a series of o-(aryleneethynylene) oligomers containing three to seven aryl units is described. The main chain in all examples is composed of between one and five 4,5-dimethoxybenzene rings which are capped on each end by 2-pyridyl rings. These oligomers demonstrate pH-dependent emission and absorption spectra. Single crystals were obtained from the aryleneethynylenes containing three to five arene rings. These single crystals were investigated by X-ray diffraction.

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Polyphenylalkyne derivatives Q 0750Pyridine-Capped, Oligomeric (o-Phenyleneethynylene)s. -The title compounds (I)-(IV) are of interest as active layers in light-emitting diodes and as building blocks for metal-organic solid-state polymers. -(SHOTWELL, S.; WINDSCHEIF, P. M.; SMITH, M. D.; BUNZ*, U.