Emission Color Tuning in 4-(2-Thienyl)pyridinium-Cyclic EnolateBetaine Dyes

摘要

Fluorescent organic dyes have applied to a wide range of fields from the textile industryto electronics and medical science.In 2017,Ritchie and coworkers reported that 4-(2-thienyl)pyridinium-cyclic enolate betaine derivatives exhibit highly efficient fluorescenceemission,indicating that pyridinium betaine dyes are good candidates of basic skeletons todevelop novel fluorophores.In the present study,we report photoluminescence (PL) propertiesof a series of fluorescent 4-(5-phenyl-2-thienyl)pyridinium-cyclic enolate betaine dyes,especially focusing on the effects of the terminal substituents on the emission color (Fig.1).