190844-70-3Relevant academic research and scientific papers
Solvatochromic and halochromic properties of some phosphonioarylimino- and phosphonioarylazo-phenolate betaine dyes
Allen, David W.,Li, Xing
, p. 1099 - 1104 (2007/10/03)
The synthesis and characterization of two new solvatochromic phosphonium betaine systems is reported.Both 4-N-(o-triorganophosphoniobenzylidene) aminophenolate and 4-(o-triphenylphosphoniophenylazo)phenolate betaine dyes exhibit negative solvatochromism, consistent with a transition to a significantly less polar excited state.The solvatochromic properties of these compounds are compared with those of a related series of pyridinium iminophenolate betaines, and also with those of the Reichardt betaine dye.Cation-induced halochromism is also observed on treating acetonitrile solutions of the phosphonium betaine dyes with alkali halides.
