Photophysical characterization of novel dipyrrine compounds based on pyrrolic hydrogen transfer

Abstract

In this work, we introduced novel dipyrromethene dyes which were synthesized in good yields from 2,4diphenyl substituted pyrroles and aromatic aldehydes. The resulting structures were elucidated by NMR, FTIR and HRMS techniques. The absorption behaviors of the synthesized dipyrromethenes in various solvents and pH media were investigated by means of UV/Vis spectroscopy. It has been observed that the compounds with dipyrromethene skeleton respond very sensitively to pH changes in visible region. The compounds have two identical colors that vary according to the solvent and pH changings depending on pyrrolic proton. Their colors are dark green in the acidic region and vivid purple in the basic media. Presented study is important for the use of aryl substituted dipyrromethene compounds as dyes for colorimetric sensoric applications, as well as for the rational design of new dyes. (c) 2022 Elsevier B.V. All rights reserved.