Highly efficient and thermally stable NLO organic materials based on pyrrole and thiophene heterocycles

Abstract

A series of novel donor-acceptor chromophores designed to have good second order nonlinear optical responses has been synthesized and characterized. This series of compounds was designed to explore the consequence of using different electron accepting moieties which were linked through an arylthiophene bridge to a pyrrole heterocycle that plays the role of an auxiliary donor group. These new push-pull chromophores have been extensively characterized using cyclic voltammetry, thermogravimetric analysis and hyper-Rayleigh scattering (HRS) in solution. The measured molecular first hyperpolarizabilities and the observed electrochemical behavior showed that they were very sensitive to the acceptor strength of the acceptor moieties. Moreover, the combination of their good nonlinearity and high thermal stability make them good candidates for potential device applications.

Recent advances on visible light pyrrole-derived photoinitiators of polymerization

“…Pyrrole is a heterocyclic five-membered ring compound in which the involvement of the lone pair electrons of nitrogen to the aromaticity of pyrrole makes this heterocycle an excellent electron donating group when combined with the appropriate group. Pyrrole is extensively used in Organic Electronics for the design of semiconductors for organic field effect transistors, [230,231] as active layers for organic photovoltaics, [232][233][234], for the design of dyes with solvatochromic properties, [235] the design of dyes with non-linear optical properties [236][237][238][239] or electrochromes. [240] Recently, pyrrole was investigated in the photopolymerization field and used as an elemental building block for the design of dyes of various structures.…”