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ABSTRACT

New highly conjugated bispyryliums were synthesized by the Knoevenagel reaction between α-CH3 pyrylium and aromatic dicarboxaldehydes. Their photophysical properties were fully investigated. The results showed that they exhibited a tunable fluorescence emission colors ranging from green to red in solution by changing the properties of connecting π bridges. The experimental results were also supported by theoretical calculations. In addition, their fluorescence emission in solid state was also investigated preliminarily. © 2012 Wiley Periodicals, Inc. Heteroatom Chem 24:66–71, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/hc.21064