Highly emissions of TPA-linear based pyrazine derivatives with different mechanochromic luminosity

• The push-pull pyrazine chromophores derivatives have been synthesized by Suzuki cross-linking reaction. • The optical properties of the effects of the solvent polarity ( E T (30)) were studied. • AIE studies have found redshift and blueshift by increasing the water fraction ( f w ) 0 to 40% and ( f w ) 50 to 90%, respectively. • These respond to “ON-OFF-ON” emission performance under the TFA/TEA addition. • Photodegradation stability depends on the molecule's effect on the functional groups. We designed the TPA-based linear pyrazine derivatives of PP-1 and PP-2 , synthesized using the conventional Suzuki cross-linking reaction. It was followed by photophysical studies such as aprotic solvent (Haxene to DMF). A red-shift was observed from the non-polar aprotic solvent to the polar aprotic solvent, and the emission intensity was gradually decreased. In addition, the Aggregation-induced emission (AIE) effect has been studied against the DMF / water addition of linear pyrazine compounds. It showed a classic aggregation-caused quenching effect (ACQ) and red-shifted at an increase of ( f w ) 0 to 40%. After this case, when the water fraction in these studies was increased by (fw) 50 to 90%, a blue shift and a mild AIE effect has occurred. And also, was investigated acidochromic effect of compounds PP-1 and PP-2 using TFA acid. Absorption and emission intensity were gradually reduced as the acid concentration increased for these studies, while the new peaks appeared red-shifted in the absorption spectrum. They were examined before and after exposure to UV light irradiation in the synthesized dye compounds.